CN1681282B - Method for realizing color ring back tone service in a code division multiple access system - Google Patents

Abstract

The present invention discloses a method for realizing the color ring service in a code division multiple access system. The key is to modify the address of the corresponding trigger in the subscription information of the user who has signed the smart service and the color ring service from the smart service SCP address to the color ring service in advance. The address of the SCP, the method includes: Step A: the mobile station of the calling user initiates a call to the called user, and the mobile switching center where the calling user is located obtains the subscription information of the called user, and according to the trigger address in the subscription information , the CRBT service SCP forwards the corresponding signaling between the mobile switching center and the intelligent service SCP to realize the intelligent service and the CRBT service, and finally connects the call to the called user via the CRBT service server by changing the number; step B: the CRBT service server Play a pre-customized ringback tone to the calling user when the calling user is idle.

Description

Method for realizing color ring back tone service in a code division multiple access system

technical field

The invention relates to the ring-back tone service field in the wireless communication technology, in particular to a method for realizing the ring-back tone service in a Code Division Multiple Access (CDMA) system.

Background technique

The ring back tone service is a service that allows mobile phone users to customize ring back tones for their mobile phones. The user can set the customized ring back tone as a pleasant music or a recording. The mode of customizing the ring back tone by the user may specifically include: selecting service provider (SP) or the music provided by the operator on the corresponding website through the Internet (INTERNET) as the ring back tone; , record the user's voice or a piece of music as its own ringback tone. In the case that the user has applied for the ring back tone service, when other users dial the user's mobile phone, the ring back tone heard is the music or recording selected by the user.

Referring to Fig. 1, this prior art adds ring tone service server (RBTS) and service provider (SP) in CDMA network, and wherein, RBTS is used for providing ring-back tone voice resource, and plays the customized voice before call is connected, The RBTS not only has switching capabilities like a switch, but also has a database that stores the user information and various user-defined ring back tones that have signed up for the ring back tone. The user can use the SP shown in the figure or make a specific call To select various voices provided by the operator, this setting can not only play a specific ring back tone for a specific calling user, but also can further include playing different ring back tones in different time periods, and when other users dial When calling the user, the RBTS selects a ring-back tone according to the called number, calling number, current time, status of the called user, etc., and plays it on the current trunk; the SP provides various ring-back tones to the user, and Upload the ring back tone selected by the user to the RBTS. In addition to the newly added RBTS and SP mentioned above, the service control point (SCP) shown in Figure 1 plays a role in controlling and processing intelligent services in the entire intelligent network system; the mobile switching center (MSC) mainly completes the service Switching function and call control function, wherein, O-MSC is the mobile switching center of the originating place, T-MSC is the mobile switching center of the called visiting place; the home location register (HLR) is mainly used to save the basic information of the mobile phone, including For the contracted service information of smart calls, when the location of the mobile phone is updated (the mobile phone is turned on or the location of the mobile phone is changed), the HLR sends this information to the MSC; the service management point (SMP) realizes the management of various data of the SCP, as shown in the figure , the thick line represents the trunk line, which can transmit voice and signaling, while the other thin or dotted lines represent the signaling link and data link respectively, and can only transmit signaling and data.

Adopt the networking diagram as shown in Figure 1, this prior art utilizes following processing flow to realize the ring back tone service on CDMA:

1), the calling user calls the called user who signed up for the ring back tone service, and the called user can be an ordinary postpaid ring back tone user, or a CDMA prepaid service (PPC)/virtual private network service (VPN) ring back tone user, but The PPC/VPN service of the PPC/VPN user must be registered on the same SCP platform as the CRBT service. Since the called user is an intelligent user, the O-MSC triggers the called CRBT service to the SCP;

2), the SCP analyzes that the called user is a CRBT service user, issues a transfer number including the RBTS number, and instructs the O-MSC to transfer the call to the RBTS;

3), the O-MSC connects the call to the RBTS, and the RBTS further connects the call to the T-MSC;

4), T-MSC pages the called user, and the mobile phone of the called user starts ringing;

5), T-MSC sends full address message (ACM) to RBTS while paging the called user, to indicate that it has been connected to the called party. Ask the user to play a custom ringback tone.

6), the called user sends an answer message (ANM) to the RBTS after off-hook, and the RBTS stops playing the ring-back tone after receiving the message, and the caller and the called party communicate normally.

Although this prior art can realize the CRBT service on the CDMA network, the realization of this service requires that the CRBT service and other intelligent services such as PPC/VPN must be registered on the same SCP, and in practical applications, CRBT is likely to occur. The situation that the service and other intelligent services are respectively registered on different SCPs, and in view of this situation, the existing technology obviously cannot realize the ring back tone service. It can be seen that the method for implementing the CRBT service in the prior art has limitations in application range, and cannot implement the CRBT service when the CRBT service and other intelligent services are registered on different SCPs.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for implementing CRBT service on CDMA, which can realize CRBT service under the condition that CRBT service and other intelligent services are registered on different SCPs.

In order to achieve the above object, the present invention provides a method for realizing the CRBT service in a code division multiple access system. The address is modified to the address of the CRBT service SCP, and the method includes:

Step A: The mobile station of the calling user initiates a call to the called user, and the mobile switching center where the calling user is located obtains the subscription information of the called user, and according to the trigger address in the subscription information, the CRBT service SCP forwards the call to the mobile switching center The corresponding signaling with the intelligent service SCP realizes the intelligent service and the CRBT service, and finally connects the call to the called user through the CRBT service server by changing the number;

Step B: The CRBT service server plays a pre-customized ring back tone to the calling user when the called user is idle.

Wherein, the corresponding trigger includes at least a called routing address available trigger;

Step A includes:

Step A11: The mobile switching center where the calling user is located obtains the subscription information of the called user from the HLR to which the called user belongs, triggers the initial terminal trigger in the subscription information, triggers the smart service to the smart service SCP, and sends the call from the called user The home HLR obtains the roaming number of the called user;

Step A12: The mobile switching center where the calling user is located uses the available trigger of the called routing address to trigger the CRBT service, and forwards the analysis message and Analyzing the response message, the intelligent service SCP and the CRBT service SCP realize the intelligent service and the CRBT service respectively; and the mobile switching center where the calling user is located can use a trigger to change the number through the called routing address, and obtain at least the CRBT service access code and the called party. The forwarding number of the user's roaming number;

Step A13: The mobile switching center where the calling user is located connects the call to the CRBT service server according to the CRBT service access code in the forwarding number, and then connects the call to the CRBT service server according to the called subscriber's roaming number in the forwarding number Connect to the mobile switching center where the called user is located.

Wherein, step A11 includes:

Step A111: The mobile switching center where the calling user is located sends a location request message to the HLR to which the called user belongs. mobile switching center;

Step A112: The mobile switching center where the calling user is located triggers the initial terminal trigger according to the trigger information in the subscription information of the called user, and sends an analysis message to the smart service SCP. After receiving the analysis message, the smart service SCP sends an analysis message to the called user Perform authentication, and after the authentication is passed, return an analysis response message to the mobile switching center where the calling user is located, and instruct the calling user mobile switching center to continue call processing;

Step A113: The mobile switching center where the calling user is located sends a location request message to the HLR to which the called user belongs. The roaming number of the called user is obtained, and then the roaming number is returned to the mobile switching center where the calling user is located through a location request response message.

Wherein, the corresponding triggers are all triggers, and step A11 includes:

Step a111: The mobile switching center where the calling user is located sends a location request message to the HLR to which the called user belongs. mobile switching center;

Step a112: The mobile switching center where the calling user is located triggers the initial terminal trigger according to the trigger information in the subscription information of the called user, and sends an analysis message to the smart service SCP through the CRBT service SCP, and the smart service SCP receives the analysis message, Authenticating the called user, after passing the authentication, forwarding through the CRBT service SCP, returning an analysis response message to the mobile switching center where the calling user is located, and instructing the calling user's mobile switching center to continue calling;

Step a113: The mobile switching center where the calling user is located sends a location request message to the HLR to which the called user belongs. The roaming number of the called user is obtained, and then the roaming number is returned to the mobile switching center where the calling user is located through a location request response message.

Wherein, step A12 includes:

Step A121: The mobile switching center where the calling user is located triggers the available trigger of the called routing address to trigger the CRBT service, the mobile switching center where the calling user is located sends an analysis message to the CRBT service SCP, and the CRBT service SCP uses the query message and the query response message Obtain the address of the intelligent service SCP from the HLR that the called user belongs to, then, the CRBT service SCP forwards the analysis message sent by the mobile switching center where the calling user is located in this step to the intelligent service SCP according to the obtained intelligent service SCP address;

Step A122: The intelligent service SCP returns an analysis response message to the mobile switching center where the calling user is located via the CRBT service SCP, and the analysis response message includes the forwarding number.

Wherein, the analysis response message in step A122 further includes an action code indicating the result of the intelligent service SCP processing the intelligent service, if the action code indicates to continue the call, then execute the step A13, otherwise, end the procedure.

Wherein, the corresponding trigger includes at least a called routing address available trigger;

When the mobile switching center where the calling user is located and the mobile switching center where the called user is located are the same mobile switching center, step A includes:

Step A21: The mobile switching center where the calling user and the called user are located obtains the subscription information of the called user from the HLR to which the called user belongs, triggers the initial terminal trigger in the subscription information, and triggers the intelligent service;

Step A22: The mobile switching center where the calling user and the called user are located uses the available trigger of the called routing address to trigger the CRBT service, and forward the CRBT service between the mobile switching center where the calling user is located and the intelligent service SCP via the CRBT service SCP The intelligent service SCP returns an analysis response message to the CRBT service SCP, and the CRBT service SCP imitates the mobile switching center to obtain the roaming number of the called user from the HLR to which the called user belongs, and then at least includes the CRBT service access code and the called The forwarding number of the user's roaming number is sent to the mobile switching center where the calling user and the called user are located.

Wherein, step A21 includes:

Step A211: The mobile switching center where the calling user is located sends a location request message to the HLR to which the called user belongs. mobile switching center;

Step A212: The mobile switching center where the calling user is located triggers the initial terminal trigger according to the trigger information in the subscription information of the called user, and sends an analysis message to the intelligent service SCP. After receiving the analysis message, the intelligent service SCP sends an analysis message to the called user Perform authentication, and after passing the authentication, return an analysis response message to the mobile switching center where the calling user is located, and instruct the calling user's mobile switching center to continue calling;

Step A213: The mobile switching center where the calling user is located sends a location request message to the HLR to which the called user belongs. The MSCID of the mobile switching center where the calling user is located is the same as the MSCID of the mobile switching center where the called user is located. mobile switching center.

Wherein, step A22 includes:

Step A221: The mobile switching center where the calling user is located triggers the available trigger of the called routing address to trigger the CRBT service, the mobile switching center where the calling user is located sends an analysis message to the CRBT service SCP, and the CRBT service SCP uses the query message and the query response message Obtain the address of the intelligent service SCP from the HLR that the called user belongs to, then, the CRBT service SCP forwards the analysis message sent by the mobile switching center where the calling user is located in this step to the intelligent service SCP according to the obtained intelligent service SCP address;

Step A222: the intelligent service SCP returns an analysis response message to the CRBT service SCP, wherein the analysis response message at least includes an action code indicating the result of the intelligent service SCP processing the intelligent service;

Step A223: The CRBT service SCP imitates the mobile switching center to send a location request message to the HLR to which the called user belongs. After receiving the message, the HLR obtains the location request message from the mobile switching center of the called user through the routing request message and the routing request response message. The roaming number of the called user, and then return the roaming number to the CRBT service SCP through the location request response message;

Step A224: The CRBT service SCP returns a response message of the analysis message in step 221 to the mobile switching center where the calling user is located, and the analysis response message includes at least the action code in step A222 and the forwarded-to number.

Wherein, the corresponding trigger includes at least an initial terminal trigger;

Step A includes:

Step A31: The mobile switching center where the calling user is located obtains the subscription information of the called user from the HLR to which the called user belongs, triggers the initial terminal trigger in the subscription information, and sends an analysis message to the CRBT service SCP, and the CRBT service SCP implements CRBT service, and using an advanced terminal trigger, the mobile switching center where the calling user is located obtains a forwarding number that includes at least the CRBT service access code and the called user number;

Step A32: The mobile switching center where the calling user is located connects the call to the mobile switching center of the called user via the CRBT service server according to the forward-to-number;

Step A33: The mobile switching center of the called user obtains the subscription information of the called user from the HLR to which the called user belongs, triggers the initial terminal trigger in the subscription information, and the mobile switching center of the called user sends the intelligent service via the color ring service SCP The SCP sends analysis messages, and the intelligent service SCP implements intelligent services.

Wherein, step A31 includes:

Step A311: The mobile switching center where the calling user is located sends a location request message to the HLR to which the called user belongs. mobile switching center;

Step A312: The mobile switching center where the calling user is located triggers the initial terminal trigger in the subscription information of the called user, and sends an analysis message to the CRBT service SCP;

Step A313: After the CRBT service SCP authenticates the called user, set the CRBT service trigger flag on the SCP, and then return an analysis response message to the mobile switching center where the calling user is located, and the trigger list parameter in the message includes advanced terminal trigger;

Step A314: The mobile switching center where the calling user is located triggers the advanced terminal trigger and sends an analysis message to the CRBT service SCP, and the CRBT service SCP sends the forwarding number including at least the CRBT service access code and the called party number through the analysis response message To the mobile switching center where the calling user is located.

Step A33 includes:

Step A331: The mobile switching center of the called user sends a location request message to the HLR to which the called user belongs. After receiving the message, the HLR returns the subscription information of the called user to the mobile switching center of the called user through a location request response message. center;

Step A332: The mobile switching center of the called user triggers the initial terminal trigger in the subscription information, sends an analysis message to the CRBT service SCP, and the CRBT service SCP clears the CRBT service trigger flag, and then, the CRBT service SCP utilizes the inquiry message and the inquiry response message Obtain the address of the intelligent service SCP from the HLR that the called user belongs to, then, the color ring back tone service SCP forwards the analysis message sent by the called user in this step to the intelligent service SCP according to the obtained intelligent service SCP address;

Step A333: The intelligent service SCP sends an analysis response message to the mobile switching center where the calling user is located via the CRBT service SCP, and the analysis response message includes an action code indicating the result of the intelligent service processed by the intelligent service SCP; The switching center obtains the current visited place information of the called user from the HLR to which the called user belongs through the location request message and the location request response message, and obtains the roaming number of the called user according to the information; and the mobile switching center of the called user triggers the called routing The address can be used as a trigger to send an analysis message to the intelligent service SCP, and the intelligent service SCP returns an analysis response message to the mobile switching center of the called user. The message includes an action code indicating the result of the intelligent service SCP processing the intelligent service.

Wherein, the corresponding triggers are all triggers, and step A31 includes:

Step a311: The mobile switching center where the calling user is located sends a location request message to the HLR to which the called user belongs. mobile switching center;

Step a312: the mobile switching center where the calling user is located triggers the initial terminal trigger in the subscription information of the called user, and sends an analysis message to the CRBT service SCP;

Step a313: After the CRBT service SCP authenticates the called user, set the CRBT service trigger flag on the SCP, and then return an analysis response message to the mobile switching center where the calling user is located, and the trigger list parameter in the message includes advanced terminal trigger;

Step a314: The mobile switching center where the calling user is located triggers the advanced terminal trigger and sends an analysis message to the CRBT service SCP, and the CRBT service SCP sends the forwarding number including at least the CRBT service access code and the called party number through the analysis response message To the mobile switching center where the calling user is located.

Step A33 includes:

Step a331: The mobile switching center of the called user sends a location request message to the HLR to which the called user belongs. After receiving the message, the HLR returns the subscription information of the called user to the mobile switching center of the called user through a location request response message. center;

Step a332: The mobile switching center of the called user triggers the initial terminal trigger in the subscription information, sends an analysis message to the CRBT service SCP, and the CRBT service SCP clears the CRBT service trigger flag, and then, the CRBT service SCP utilizes the query message and the query response message Obtain the address of the intelligent service SCP from the HLR that the called user belongs to, then, the color ring back tone service SCP forwards the analysis message sent by the called user in this step to the intelligent service SCP according to the obtained intelligent service SCP address;

Step a333: the intelligent service SCP sends an analysis response message to the mobile switching center where the calling user is located via the CRBT service SCP, and the analysis response message includes an action code indicating the result of the intelligent service processed by the intelligent service SCP; The switching center obtains the current visited place information of the called user from the HLR to which the called user belongs through the location request message and the location request response message, and obtains the roaming number of the called user according to the information; and the mobile switching center of the called user triggers the called routing The address can be triggered, forwarded via the CRBT service SCP, and sends an analysis message to the intelligent service SCP, and the intelligent service SCP forwards it via the CRBT service SCP, and returns an analysis response message to the mobile switching center of the called user. The action code for the SCP to process the result of the intelligent service.

Wherein, the corresponding trigger includes at least an initial terminal trigger;

Step A includes:

Step A41: The mobile switching center where the calling user is located obtains the subscription information of the called user from the HLR to which the called user belongs, triggers the initial terminal trigger in the subscription information, and the CRBT service SCP forwards the mobile switching center where the calling user is located and Analysis messages and analysis response messages between intelligent service SCPs to realize intelligent services;

Step A42: The mobile switching center where the calling user is located triggers the advanced terminal trigger, and sends an analysis message to the CRBT service SCP. The CRBT service SCP obtains the roaming number of the called user through the HLR to which the called user belongs according to the mobile switching center, and the CRBT service SCP Sending the forwarding number including at least the CRBT service access code and the called user's roaming number to the mobile switching center where the calling user is located;

Step A43: The mobile switching center where the calling user is located connects the call to the CRBT service server according to the CRBT service access code in the forwarded-to number, and then connects the call to the CRBT service server according to the called user's roaming number in the forwarded-to number. The server is connected to the mobile switching center where the called user is located.

Wherein, step A41 includes:

Step A411: The mobile switching center where the calling user is located sends a location request message to the HLR to which the called user belongs. mobile switching center;

Step A412: The mobile switching center where the calling user is located triggers the initial terminal trigger in the subscription information of the called user, and sends an analysis message to the CRBT service SCP;

Step A413: The CRBT service SCP obtains the address of the smart service SCP from the HLR to which the called user belongs by using the query message and the query response message, and then, the CRBT service SCP analyzes the information sent by the called user in step 412 according to the obtained smart service SCP address. The message is forwarded to the intelligent service SCP;

Step 414: The intelligent service SCP sends an analysis response message to the mobile switching center where the calling user is located via the CRBT service SCP, and the analysis response message includes an action code indicating the result of the intelligent service SCP processing the intelligent service.

Wherein, step A42 includes:

Step A421: The mobile switching center where the calling user is located triggers an advanced terminal trigger and sends an analysis message to the CRBT service SCP;

Step A422: The CRBT service SCP imitates the mobile switching center to send a location request message to the HLR to which the called user belongs. After receiving the message, the HLR obtains the location request message from the mobile switching center of the called user through the routing request message and the routing request response message. The roaming number of the called user, and then return the roaming number to the CRBT service SCP through the location request response message;

Step A423: The CRBT service SCP triggers the called routing address availability trigger, sends an analysis message to the smart service SCP, and the smart service SCP returns an analysis response message to the CRBT service SCP, and the message includes the result of processing the smart service by the smart service SCP. action code;

Step A424: The CRBT service SCP returns a response message to the analysis message sent in step A421 to the mobile switching center where the calling user is located, and the message carries the forwarding number.

Wherein, step B includes:

The mobile switching center of the called user judges the current state of the called user. If the current state of the called user is idle, the mobile switching center of the called user sends the address full message to the mobile switching center where the calling user is located via the color ring back tone service server. message to establish a call connection between the calling user and the called user, the CRBT service server plays a pre-customized ring back tone to the calling user, and the mobile station of the called user rings.

Wherein, if the current status of the called user is busy, the method further includes:

The mobile switching center of the called user's visiting place directly plays a prompt tone prompting the called user to be busy to the mobile switching center where the calling user is located, and releases the communication between the mobile switching center where the calling user is located and the mobile switching center where the called user is visiting. It is connected via the voice channel of the CRBT service server.

Wherein, after step B, the method further includes:

Step C: The called user picks up the phone to answer, the CRBT service server stops playing the ring back tone to the calling user, and the calling user and the called user talk.

Wherein, after step C, the method further includes:

When the calling user or the called user hangs up, the smart service SCP ends the smart service, and releases the voice channel connection between the mobile switching center where the calling user is located and the mobile switching center where the called user is visiting via the CRBT service server.

Wherein, the intelligent service includes a CDMA prepaid service or a virtual private network service.

It can be seen that in the present invention, the intelligent service and the CRBT service are respectively realized through the intelligent service SCP and the CRBT service SCP, so that when the CRBT service and the intelligent service are respectively registered on different SCPs, the intelligent service SCP and the CRBT service SCP can be used , to realize the color ring service without affecting the realization of intelligent services; in practical application, by adding a color ring service server and upgrading the SCP service software, the intelligent users on different SCP platforms can use the color ring service, thus eliminating the need for Upgrade existing network equipment, easy to promote and implement to users. Through the CRBT service, the existing tedious ring-back tone is replaced with beautiful music, enabling mobile operators to take the lead in providing personalized services and differentiated services for users, thereby enhancing the operator's corporate image. In addition, the CRBT service realizes the full opening of the capabilities of the communication network to users. On the basis that users can customize ring-back tones, the user's own communication becomes more colorful, and finally achieves the purpose of fully stimulating user traffic.

Description of drawings

FIG. 1 is a network diagram of a ring back tone service in the prior art.

Fig. 2 is a network diagram of the CRBT service in the present invention.

Fig. 3 is a flow chart of implementing the CRBT service in an embodiment of the present invention.

Fig. 4 is a flow chart of implementing the CRBT service in another embodiment of the present invention.

Fig. 5 is a flow chart of implementing the CRBT service in another embodiment of the present invention.

Fig. 6 is a flow chart of implementing the CRBT service in another embodiment of the present invention.

Fig. 7 is a flow chart of implementing the CRBT service in another embodiment of the present invention.

Fig. 8 is a flow chart of implementing the CRBT service in another embodiment of the present invention.

Detailed ways

The present invention is a method for realizing color ring back tone service on a CDMA network, the method

The present invention will be described in detail below in conjunction with the accompanying drawings.

Fig. 2 shows the network diagram for realizing the present invention, in Fig. 2, the prepaid service of mobile phone user is registered on the PPC-SCP, and the CRBT service of mobile phone user is then registered on the CRBT SCP, all the other components in this figure And the realization function of each composition is consistent with Fig. 1. In other embodiments of the present invention, according to the different intelligent services implemented, other corresponding services such as VPN services are also registered on another SCP different from the SCP that registers the CRBT service. The following embodiments of the present invention only Taking the PPC service and the CRBT service registered on different SCPs as an example for illustration, for other intelligent services and the CRBT service registered on different SCPs, the method for realizing the CRBT service of the present invention and the PPC service and CRBT service are respectively registered in The implementation methods of different SCPs are similar.

According to whether the MSC in the CDMA supports the called routing address available trigger (CDRAA) to change the number, and whether the HLR supports different triggers to sign up to different SCPs, the specific flow of the method for realizing the ring back tone service in the present invention will be different, and the following are respectively aimed at Whether MSC supports CDRAA number change, and whether HLR supports different triggers to subscribe to different SCPs describe the specific implementation process of the present invention.

Before describing each specific embodiment of the present invention, at first MSC supports CDRAA number change, and HLR supports different triggers to sign up to different SCPs to explain:

(1) CDRAA number change: In the process of implementing call connection through the intelligent network, multiple triggers need to be used in the called process, among which the triggers related to SCP mainly include: initial terminal (Initial_Termination) trigger, advanced Terminal (Advanced_Termination) triggers, CDRAA triggers, Tanswer triggers, and Tdisconnect triggers, wherein the advanced terminal triggers can be referred to as ADVANCED for short; in order to realize the ring back tone service, the call can be triggered by modifying the SCP address of the corresponding trigger to The SCP used to realize the color ring service, in the prior art, mostly realizes the call connection in the color ring service through the ADVANCED trigger number change mode, in the present invention, the CDRAA number change mode discussed refers to changing the CDRAA The SCP address of the trigger, so that when the CDRAA trigger is triggered, the trigger can be reported to the SCP that implements the ring back tone service, and finally realizes the modification of the connection number;

(2) HLR supports different triggers to sign up to different SCPs:

HLR supports different triggers to sign up to different SCPs: in a CDMA network, a SCP can be identified by a GT code, which is equivalent to an IP address in the Internet and used to represent the address of the SCP; in the HLR, for each user There is a data table respectively, and the GT codes of the SCPs corresponding to the different triggers related to the call flow are listed in the data table. The HLR described in the present invention supports different triggers to sign to different SCPs refers to: the above-mentioned different The GT codes of the SCPs corresponding to different triggers can be different. Therefore, during the call process, since the MSC can obtain the GT codes of different SCPs corresponding to different triggers from the HLR, the MSC can send each message corresponding to different triggers sent to a different SCP.

Whether MSC supports CDRAA number change, and whether HLR supports different triggers to sign up to different SCPs respectively below, the realization of the present invention is described in detail. In the following narrations, user A is used as the calling user, and user B is used as The called user, and user B is a PPC user registered for the CRBT service:

Embodiment 1: MSC supports CDRAA number change, HLR supports different triggers to subscribe to different SCPs, and calling user A and called user B are in different mobile switching centers respectively;

Under the situation that MSC supports CDRAA number change and HLR supports different triggers to sign up to different SCPs, in order to realize the present invention, utilize HLR to support the function of different triggers to sign up to different SCPs, in the HLR that user B belongs to, set its CDRAA trigger change the SCP address of the CRBT service to the SCP address of the CRBT service, so as to realize the subscription of the CRBT service to the called user B, and the rest of the subscription information of the user B in the HLR to which it belongs remains the original subscription information when only the PPC service is signed. After carrying out the above modifications, referring to Fig. 3, the following steps are required to realize the present invention:

Step 301: The calling user A calls the called user B. Since in the embodiment of the present invention, the calling user A and the called user B are in different mobile switching centers respectively, therefore, the calling user A is in the mobile The switching center starts the called process of user B;

Steps 302 to 303: The mobile switching center where the calling user A is located sends a location request (LOCREQ) message to the HLR to which the called user B belongs to request the subscription information of the called user B. After the HLR receives the request, Find the subscription information of user B, and return the subscription information of user B to the mobile switching center of calling user A through the locreq message;

Steps 304 to 305: The mobile switching center of calling user A detects the Initial_Termination trigger, and through this trigger, the mobile switching center of calling user A triggers the PPC service, thereby sending an analysis information (ANLYZD) message to the SCP of the PPC service , after receiving the ANLYZD message, the SCP of the PPC service authenticates the called user B. After the authentication is passed, it returns an analysis information response (anlyzd) message to the mobile switching center of the calling user A, indicating that the calling user A's The mobile switching center continues call processing;

Steps 306 to 309: The mobile switching center of the calling user A sends a LOCREQ message to the home HLR of the called user B to request the roaming number (TLDN) of the called user B, and the HLR of the called user B receives the message After the message, send a routing request (ROUTREQ) message to the visited mobile switching center of the called user B to request to obtain the roaming number of the called user B from the visited mobile switching center, which is the called mobile switching center. The user allocates a TLDN, and returns the TLDN to the home HLR of the called user B through a routreq message, and the HLR returns the TLDN of the called user B to the mobile switching center of the calling user A through a LOCREQ response message (locreq);

Step 310: The mobile switching center of calling user A detects a CDRAA trigger, wherein the SCP address of the CDRAA trigger has been modified to the address of the SCP of the CRBT service, and the mobile switching center of calling user A triggers the CDRAA trigger , sending an ANLYZD message to the SCP of the CRBT service according to the SCP address in the trigger, so as to issue a new routing number by using the CDRAA number change in the following steps 311 to 315;

Steps 311 to 312: the SCP of the CRBT service sends a query (SEARCH) message to the HLR of the called user B to request the address of the SCP for the called user B to implement the PPC service, and the HLR of the called user B receives the SEARCH message Afterwards, return the SCP address of the PPC service to the SCP of the CRBT service by the SEARCH response message (search) to the called user B;

Step 313: The SCP of the CRBT service forwards the ANLYZD message received in step 310 to the SCP of the PPC service according to the SCP address of the PPC service received in step 312, so that the SCP of the PPC service handles the subsequent PPC service process ;

Step 314: After receiving the ANLYZD message, the SCP of the PPC service returns a response message (anlyzd) of ANLYZD to the SCP of the CRBT service; the parameter action code (ActionCode) carried in the anlyzd message is used to represent the processing result of the SCP of the PPC service ;

Step 315: after the SCP of CRBT service receives the anlyzd message sent by the SCP of PPC service in step 314, according to the parameter action code in the message, send ANLYZD response message (anlyzd) to the mobile switching center of calling user A, with Instruct the mobile switching center of calling user A to perform corresponding operations according to the processing result of the SCP of the PPC service: if the parameter action code carried in the anlyzd message sent in step 314 indicates that the processing result of the SCP of the PPC service is to continue calling Processing, then in this step, the SCP of CRBT service sends the anlyzd message to the mobile switching center of calling user A, then executes step 316 and subsequent steps thereof, and the parameter action code in the anylyzd message sent in this step is used to indicate this The mobile switching center continues the call, and also sends the diversion number to the mobile switching center of the called user A through the anlyzd message: CRBT service access code + called user roaming number, wherein, the routing address of the CRBT service access code is The address of the CRBT service server, and the roaming number of the called user is the temporary local directory number (TLDN) of the called user; if the parameter action code carried in the anlyzd message sent in the step 314 represents the processing result of the SCP of the PPC service For terminating the call, then in this step, the SCP of the CRBT service sends an anlyzd message to the mobile switching center of calling user A, to indicate that this mobile switching center ends the call, and ends the entire call processing flow; wherein, the anlyzd message in this step Be the response message of the ANLYZD message of step 310;

Step 316: The mobile switching center of calling user A connects the call to the ring back tone service server according to the diverting number in the anlyzd message sent in step 315, and its specific implementation is: the mobile switching center of calling user A The redirection number in the anlyzd message sent in the analysis shows that the routing address of the CRBT service access code is the address of the CRBT service server, and the mobile switching center of the calling user A sends an initial address message to the CRBT service server, and the called party in the message The number is the access code of the CRBT service + the roaming number of the called user, and the calling number in the message is the number of the calling user A;

Step 317: the CRBT service server connects the call to the mobile switching center where the called user B is located, which is specifically implemented as: the CRBT service access code in the called number of the initial address message sent by the CRBT service server according to the initial address message sent in step 316 and the CRBT service access code as The number of user B of the original called number is analyzed to obtain that user B has registered for the CRBT service. Then, the CRBT service server sends an initial address message to the mobile switching center of the visited place of user B, and the called number in the message is that in step 315. The roaming number of the called user B in the diverted number, the calling number of the message is the number of the calling user A, and according to the called number, the message is sent to the mobile switching center where the called user B is located, so that The call is connected to the mobile switching center where the called user B is located;

Step 318: the mobile switching center where the called user B is located judges the status of the called user B, if the called user B is in an idle state, then execute step 319 and its subsequent steps, otherwise, execute step 333;

Steps 319 to 320: A call is established between the mobile switching center where the called user B is located and the called user B, the mobile station of the called user B rings, and the mobile switching center of the called user B returns the full address to the CRBT service server. message, indicating that the called user B is in an idle state to the ring-back tone server through the parameters carried in the message;

Step 321: The CRBT service server analyzes the full address message returned by the mobile switching center of the called user B, determines that the called user B is in an idle state by the analysis result, and the CRBT service server according to the pre-customized CRBT service information of the called user B, Play a customized ring back tone to the calling user A, and at the same time, the CRBT service server sends a full address message to the mobile switching center where the calling user A is located, so as to establish a call between the called user B and the calling user A via the CRBT service server. call;

Steps 322 to 324: The called user B picks up the phone to answer, the mobile switching center where the called user B is located sends a TANSWER message to the SCP of the PPC service, and notifies the SCP of the PPC service to start billing, and the called user B The visited mobile switching center sends a response message to the CRBT service server;

Step 325: After receiving the response message, the CRBT service server stops playing the ring-back tone to the calling user A, and sends a response message to the calling user A, and connects the call path between the calling user A and the called user B, Calling user A and called user B use this channel to talk;

Steps 326 to 328: calling user A or called user B hangs up, and releases the trunk channel between calling user A or called user B and the SCP of the PPC service; in the embodiment of the present invention, the called user B On-hook as an example, when called user B hangs up, the mobile switching center where called user B is located sends a TDISCONNECT message to the SCP of the PPC service. After receiving the message, the SCP of the PPC service returns a TDISCONNECT message to the mobile switching center where called user B is located. reply message (tdisconnect);

Steps 329 to 332: The mobile switching center where the called user B is located sends a release message to the mobile switching center where the calling user A is located via the CRBT service server, and the mobile switching center where the calling user A is located sends a release message to the called user via the CRBT service server The mobile switching center where B is located returns a release success message, thereby releasing the trunk voice path between the calling user A and the called user B, and then ending the CRBT service flow;

In other embodiments of the present invention, when the calling user A hangs up, the process of releasing the trunk voice path between the calling user and the called user is similar to the process described in the above steps 326 to 332;

Steps 333 to 338: Steps 333 to 338 are the steps executed when the called user B is in a busy state. The center sends a full address message to the mobile switching center where calling user A is located via the color ring back tone service server, and directly plays a busy tone or other prompt tones to calling user A, and then uses the release message and release completion message of steps 335 to 338 to release the calling user. The trunk call between calling user A and called user B is completed, and then the CRBT service flow is ended.

Embodiment 2: MSC supports CDRAA number change, HLR supports different triggers to subscribe to different SCPs, and calling user A and called user B are in the same mobile switching center. In this embodiment, the mobile switching centers are both Refers to the mobile switching center where the calling user A and called user B are located;

Referring to Fig. 4, under the situation that MSC supports CDRAA number change and HLR supports different triggers to sign up to different SCPs, in order to realize the present invention, at first utilize HLR to support the function of different triggers to sign up to different SCPs, in the HLR that user B belongs to Change the SCP address of its CDRAA trigger to the SCP address of the CRBT service, so as to realize that the called user B subscribes to the CRBT service, while the rest of the subscription information of user B in the HLR to which he belongs remains the same as when he only signed the PPC service After the above modification, the implementation of the present invention requires the following steps:

Step 401: Calling user A calls called user B. Since calling user A and called user B are in the same mobile switching center in the embodiment of the present invention, calling user A is between calling user A and called user B. The mobile switching center where the called user B is located starts the called process;

Steps 402 to 403: The mobile switching center sends a location request (LOCREQ) message to the HLR to which the called user B belongs to request to obtain the subscription information of the called user B. After receiving the request, the HLR searches for the subscription information of the user B information, and return the subscription information of user B to the mobile switching center through the locreq message;

Steps 404 to 405: The MSC detects the Initial_Termination trigger. Through the trigger, the MSC of calling user A triggers the PPC service, sends the ANLYZD message to the SCP of the PPC service, and the SCP of the PPC service receives the ANLYZD message Finally, the called user B is authenticated, and after the authentication is passed, the anlyzd message is returned to the mobile switching center of the calling user A, indicating that the mobile switching center of the calling user A continues to call;

Step 406～step 407: the mobile switching center sends the LOCREQ message to the HLR of the called user B, in order to request to obtain the roaming number (TLDN) of the called user B, because the home location register judges and obtains the MSCID of the mobile switching center in the LOCREQ message It is the same as the MSCID of the visited mobile switching center of the called user B saved by itself, so it is judged that the called user B and the calling user A are in the same MSC, and the home location register of the called user B directly returns the location to the mobile switching center A request response message, which includes the MSCID of the visited place of the called user B, but does not include the roaming number TLDN;

Step 408: The mobile switching center detects a CDRAA trigger, wherein the SCP address of the CDRAA trigger has been modified to the address of the SCP of the CRBT service, the mobile switching center triggers the CDRAA trigger, and sends an The SCP of the CRBT service sends the ANLYZD message, so as to realize issuing a new routing number by using CDRAA to change the number in subsequent steps 409 to 417;

Steps 409 to 410: The SCP of the CRBT service sends a SEARCH message to the HLR of the called user B to request the address of the SCP of the PPC service of the called user B. After receiving the SEARCH message, the HLR of the called user B sends the message through The search message returns the SCP address of the PPC service of the called user B to the SCP of the CRBT service;

Step 411: The SCP of the CRBT service forwards the ANLYZD message received in step 408 to the SCP of the PPC service according to the SCP address of the PPC service received in step 410, so that the SCP of the PPC service handles the subsequent PPC service flow ;

Step 412: After receiving the ANLYZD message, the SCP of the PPC service returns the ANLYZD response message (anlyzd) to the SCP of the CRBT service; wherein, the anlyzd message is the response message of the ANLYZD message in step 411, and the parameter action carried in the anlyzd message The code (ActionCode) is used to represent the processing result of the SCP of the PPC business;

Steps 413 to 416: Since the locreq message in step 407 does not include the TLDN of the called user B's roaming number, the SCP of the CRBT service sends a LOCREQ message to the HLR of user B to request the called user B The roaming number of B, the HLR of the called user B sends a ROUTREQ message to the mobile switching center to request the roaming number of the called user B from the mobile switching center, and the mobile switching center returns the TLDN of the called user B through the routreq message To the HLR of the called user B, the HLR returns the TLDN of the called user B to the SCP of the CRBT service modeled on the Mobile Switching Center by the LOCREQ response message (locreq) again;

Step 417: the SCP of CRBT service sends the ANLYZD response message (anlyzd) to Mobile Switching Center according to the parameter action code in the anlyzd message that the SCP of PPC service in step 412 sends, to indicate that Mobile Switching Center according to the SCP of PPC service The processing result carries out corresponding operation: if the parameter action code carried in the anylyzd message sent in the step 412 represents that the processing result of the SCP of the PPC service is to continue the call processing, then in this step, the SCP of the color ring service sends a message to the mobile switching center Send the anlyzd message, then perform step 418 and subsequent steps thereof, the parameter action code in the anlyzd message sent in this step is used to instruct this mobile switching center to continue calling, and also to the mobile of called user A by this anlyzd message The switching center issues the redirection number: the access code of the CRBT service + the roaming number of the called user, wherein the routing address of the CRBT service access code is the address of the CRBT service server, and the roaming number of the called user is the temporary local number book of the called user Number (TLDN); If the parameter action code carried in the anlyzd message sent in the step 412 represents that the processing result of the SCP of the PPC service is to end the call, then in this step, the SCP of the color ring service sends the anlyzd message to the mobile switching center , to instruct the mobile switching center to end the call and end the entire call processing flow; wherein, the anlyzd message in this step is the response message of the ANLYZD message in step 408;

Step 418: The mobile switching center connects the call to the CRBT service server according to the diverting number in the anlyzd message sent in step 417, which is specifically implemented as: the mobile switching center according to the diverting number in the anlyzd message sent in step 417 The routing address of the CRBT service access code is analyzed to be the address of the CRBT service server, and the mobile switching center sends an initial address message to the CRBT service server. The called number in the message is the CRBT service access code+the roaming number of the called user. The calling number in the message is the number of calling user A;

Step 419: The CRBT service server connects the call to the mobile switching center, wherein the mobile switching center is the mobile switching center where the called user B and the calling user A are located; The CRBT service access code in the called number of the initial address message and the number of user B as the original called number are analyzed to obtain that user B has registered the CRBT service, and then the CRBT service server sends the initial address message to the mobile switching center, The called number in the message is the roaming number of the called user B, and the calling number of the message is the number of the calling user A. According to the called number, the message is sent to the mobile switching center, thereby connecting the call to the mobile exchange center;

Step 420: the mobile switching center judges the state of the called user B, if the called user B is in an idle state, then execute step 421 and its subsequent steps, otherwise, execute step 432;

Steps 421 to 422: A call is established between the mobile switching center and the called user B, the mobile station of the called user B rings, the mobile switching center returns the full address message to the color ring back tone service server, and sends the message to the user through the parameters carried in the message The ring back tone server indicates that the called user B is in an idle state;

Step 423: The CRBT service server analyzes the full address message returned by the mobile switching center of the called user B, determines that the called user B is in an idle state by the analysis result, and the CRBT service server according to the pre-customized CRBT service information of the called user B, Play a customized ring back tone to the calling user A, and at the same time, the CRBT service server sends a full address message to the mobile switching center to establish a call between the called user B and the calling user A via the CRBT service server;

Steps 424 to 426: The called user B picks up the phone to answer, and the visited mobile switching center where the called user B is located sends a TANSWER message to the SCP of the PPC service to notify the SCP of the PPC service to start billing, and the called user B The visited mobile switching center sends a response message to the CRBT service server;

Step 427: After receiving the response message, the CRBT service server stops playing the ring-back tone to the calling user A, and sends a response message to the mobile switching center to connect the call path between the calling user A and the called user B. Calling user A and called user B use this channel to talk;

Steps 428 to 430: calling user A or called user B hangs up, and releases the trunk channel between calling user A or called user B and the SCP of the PPC service; in the embodiment of the present invention, the called user B On-hook is an example, the called user B hangs up, and the mobile switching center sends a TDISCONNECT message to the SCP of the PPC service. After receiving the message, the SCP of the PPC service returns a TDISCONNECT response message (tdisconnect) to the mobile switching center;

Step 431: release the trunk call between calling user A and called user B, and then end the CRBT service flow;

In other embodiments of the present invention, when the calling user A hangs up, the process of releasing the trunk voice path between the calling user and the called user is similar to the process described in the above steps 428 to 431;

Step 432～step 434: Step 432～step 434 is the step that is executed when called subscriber B is in busy state, after judging in step 420 that called subscriber B is in busy condition, mobile switching center directly calls calling subscriber B Play the busy tone or other prompt tone, and then release the trunk conversation between the calling party and the called party through the "Release" message. The process ends.

Embodiment 3: MSC does not support CDRAA number change, HLR supports different triggers to sign up to different SCPs; in the embodiment of the present invention, because HLR supports different triggers to sign up to different SCPs, therefore, modify the called user B in its home In the subscription information in the HLR, the SCP address of the Initial_Termination trigger is modified to the address of the SCP of the CRBT service, so that the called user B can sign up for the CRBT service, and the rest of the subscription information of user B in its home HLR remains For the signing information when only signing the PPC business originally, after the above-mentioned modification has been carried out, referring to Fig. 5, the following steps are required to realize the present invention:

Step 501: the calling user A calls the called user B, because in the embodiment of the present invention, the calling user A and the called user B are respectively in different mobile switching centers, therefore, the calling user A is in the mobile The switching center starts the called process; in other embodiments of the present invention, if the calling user A and the called user B are located in the same mobile switching center, then start the called process at the mobile switching center;

Steps 502 to 503: The mobile switching center where the calling user A is located sends a location request (LOCREQ) message to the HLR to which the called user B belongs to request the subscription information of the called user B. After the HLR receives the request, Find the subscription information of user B, and return the subscription information of user B to the mobile switching center of calling user A through the locreq message;

Steps 504 to 505: The called process detects the Initial_Termination trigger. Since the SCP address of the Initial_Termination trigger has been modified to the SCP address of the CRBT service, after the trigger is triggered, the mobile switching center where the calling user A is located sends The SCP of the CRBT service sends the ANLYZD message. After receiving the message, the SCP of the CRBT service authenticates the called user B. After the authentication is passed, the SCP of the CRBT service judges that the trigger flag of the CRBT service on itself is cleared. This trigger needs to carry out the color ring service, at first set the trigger flag of the color ring service on itself, to indicate that the color ring service SCP carries out the color ring service, then, return the anlyzd message to the mobile switching center where the calling user A is located, in the message The trigger list parameter contains the Advanced_Termination trigger;

Steps 506 to 507: The mobile switching center where the calling user A is located triggers the Advanced_Termination trigger and sends the ANLYZD message to the SCP of the CRBT service. After receiving the message, the SCP of the CRBT service uses ADVANCED to change the number and sends it to the mobile switching center Diverting number, the diverting number is: CRBT service access code + number (MDN) of called user B;

Step 508: The mobile switching center where the calling user A is located connects the call to the CRBT service server according to the redirection number issued in step 507. The routing address of the CRBT service access code is the CRBT service server. The mobile switching center sends an initial address message to the CRBT service server. The called number in the message is the CRBT service access code+the number of called user B. The calling number is the number of the calling user A, and the initial address message is used to connect the call to the ring back tone service server;

Step 509: According to the CRBT service access code in the called number of the initial address message sent in step 508 and the number of the called user B as the original called number, the CRBT service server analyzes and obtains that the called user B has registered the CRBT Then, the CRBT service server sends an initial address message to the mobile switching center where the called user B is located, so as to connect the call to the mobile switching center where the called user B is located, wherein the called number of the initial address message is called The number of user B, the calling number is the number of calling user A;

Step 510～step 511: the mobile switching center where called user B is located obtains the subscription information of called user B from the HLR of called user B by the LOCREQ message and the response message (locreq) of the LOCREQ message;

Step 512: The mobile switching center where the called user B is located triggers the Initial_Termination trigger in the subscription information, and sends the ANLYZD message to the SCP of the CRBT service;

Step 513: After receiving the ANLYAD message, the SCP of the CRBT service authenticates the called party. After the authentication is passed, since the SCP of the CRBT service has set the CRBT service trigger flag of the called user in step 504, therefore, The SCP of the CRBT service triggers the PPC service process of the called user B, first clears the trigger flag of the CRBT service, and then, the SCP of the CRBT service sends a SEARCH message to the HLR of the called user B to request to obtain the PPC service of the called user B the SCP address;

Step 514: the HLR of the called user B returns the SCP address of the PPC service of the called user B to the SCP of the CRBT service through the response message (search) of SEARCH;

Steps 515 to 516: The SCP of the CRBT service forwards the ANLYZD message received in step 504 to the SCP of the PPC service according to the SCP address of the PPC service returned in the step 514. After receiving the message, the SCP of the PPC service sends the CRBT message The SCP of the business returns the response message (anlyzd) of ANLYZD, and the action code parameter of the anlyzd message is used to represent the processing result of the SCP of the PPC business;

Step 517: If the action code parameter in the onlyzd message in step 516 indicates that the call is terminated, then the SCP of the color ring service sends an onlyzd message to the mobile switching center where the calling user A is located, indicating that the mobile switching center ends the call processing, and then ends this call Color ring service; if the action code parameter in the anlyzd message in the step 516 represents continuing to call, then the SCP of the color ring service sends the onlyzd message to the mobile switching center where calling user A is located, and indicates that the mobile switching center finishes continuing the call process, and then executes the steps 518 and its subsequent steps;

Steps 518 to 519: The mobile switching center where the called user B is located sends a LOCREQ message to the HLR to which the called user B belongs to request to obtain the roaming number of the called user B. The mobile switching center and the mobile switching center where the called user B is currently located are the same mobile switching center, and the HLR returns a LOCREQ response message (locreq) to the mobile switching center where the called user B is located, and the locreq message includes the called user. The mobile switching center identification (MSCID) parameter of the mobile switching center where B is located, and the mobile switching center analyzes that its own MSCID is identical with the MSCID where the called user B is obtained from the HLR, and directly distributes a TLDN for the called user B;

Step 520: The mobile switching center where the called user B is located detects the CDRAA trigger. Since the SCP address corresponding to the CDRAA trigger is the SCP address of the PPC service, after the trigger is triggered, the mobile switching center where the called user B is located The center sends an ANLYZD message to the SCP of the PPC business;

Step 521: After receiving the ANLYZD message sent in the step 520, the SCP of the PPC service analyzes the message, and then returns a response message (anlyzd) of ANLYZD to the mobile switching center of the called user B, and the parameter action in the anlyzd message The code is used to indicate the result of processing by the SCP of the PPC service. If the processing result is to terminate the call, the mobile switching center of the called user B will end the call processing after receiving the anlyzd message, and end the CRBT service flow; if The result of the processing is to continue calling, then the mobile switching center of the called user B will execute step 522 and subsequent steps thereof after receiving the anlyzd message;

Step 522: the mobile switching center of the called user B judges the current state of the called user B, if the called user B is idle, then execute step 523 and its subsequent steps, otherwise, execute step 534;

Step 523: The mobile switching center where the called user B is located initiates paging to the mobile station of the called user B, establishes a call with the mobile station of the called user B, and makes the mobile station of the called user B perform, for example, vibrate The prompt action of the bell;

Step 524: The mobile switching center where the called user B is located sends a complete address message to the CRBT service server, and the parameters in the message indicate that the called user B is currently idle;

Step 525: The CRBT service server analyzes the full address message sent in step 524 to obtain that the called user B is currently idle, and according to the pre-customized CRBT service information of the called user B, the CRBT service server plays the customized reply to the calling user A. ring tone, and send a full address message to the mobile switching center where the calling user A is located, to establish a call connection between the calling user A and the called user B;

Steps 526 to 528: The called user B picks up the phone to answer, and the mobile switching center where the called user B is located sends a TANSWER message to the SCP of the PPC service to notify the SCP of the PPC service to perform operations such as charging, and the called user B The mobile switching center where B is located sends a response message to the CRBT service server;

Step 529: After receiving the response message sent in step 528, the CRBT service server stops playing the ring back tone to calling user A, and sends a response message to the mobile switching center where calling user A is located, and calling user A Normal conversation with called user B;

Steps 530 to 533: both parties in the call hang up, release the trunk call between calling user A and called user B, and the CRBT service ends;

Steps 534 to 536: Steps 534 to 536 are the steps performed when the called user B is in a busy state. The mobile switching center where the called user B is located plays a busy tone or other prompts to the calling user, and then releases the caller and called party. The trunk call between them, the CRBT service ends.

Embodiment 4: MSC does not support CDRAA number change, and HLR supports different triggers to sign up to different SCPs; in the embodiment of the present invention, since HLR supports different triggers to sign up to different SCPs, therefore, modify the called user B in its home In the subscription information in the HLR, the SCP address of the Initial_Termination trigger is modified to the address of the SCP of the CRBT service, so that the called user B can sign up for the CRBT service, and the rest of the subscription information of user B in its home HLR remains For the signing information when only signing the PPC business originally, after the above-mentioned modification has been carried out, referring to Fig. 6, the following steps are required to realize the present invention:

Step 601: Calling user A calls called user B. Since calling user A and called user B are in different mobile switching centers in the embodiment of the present invention, calling user A is in the mobile The switching center starts the called process; in other embodiments of the present invention, if the calling user A and the called user B are located in the same mobile switching center, then start the called process at the mobile switching center;

Steps 602 to 603: The mobile switching center where the calling user A is located sends a location request (LOCREQ) message to the HLR to which the called user B belongs to request the subscription information of the called user B. After the HLR receives the request, Find the subscription information of user B, and return the subscription information of user B to the mobile switching center of calling user A through the locreq message;

Steps 604 to 606: The called process detects the Initial_Termination trigger. Since the SCP address of the Initial_Tarmination trigger has been changed to the SCP address of the CRBT service, after the trigger is triggered, the mobile switching center where the calling user A is located sends The SCP of the CRBT service sends an ANLYZD message. After receiving the message, the SCP of the CRBT service authenticates the called user B. After the authentication is passed, the SCP of the CRBT service sends a SEARCH message to the HLR to request to obtain the called user B's ID. The address of the SCP of PPC service, HLR returns the SCP address of the PPC service of called user B to the SCP of ring back tone service by SEARCH response message (search);

Step 607～step 609: the SCP of CRBT service forwards the ANLYZD message received in step 604 to the SCP of PPC service according to the address returned by HLR in step 606, and after the PPC service control point receives the ANLYZD message, sends CRBT service The SCP returns the ANLYZD response message (anlyzd), and the parameter action code (ActionCode) in the message indicates the processing result of the PPC service control point: if the parameter action code indicates that the call is to be terminated, the SCP of the color ring back tone service sends a message to the caller A's The mobile switching center sends an anlyzd message to indicate that the mobile switching center terminates the call and ends the CRBT service process; if the parameter action code indicates that the call is continued, the SCP of the CRBT service sends the anlyzd message to the mobile switching center of the calling user A, the The parameter action code in the message indicates that the call continues, wherein the parameter "trigger list" in the message contains the "Advanced_Termination" trigger;

Step 610: The mobile switching center where the calling user A is located triggers the Advanced_Termination trigger and sends an ANLYZD message to the SCP of the CRBT service, so as to utilize the ADVANCED number changing function, and realize issuing the diverting number in the following steps 611 to 617;

Steps 611 to 614: The CRBT service SCP imitates the mobile switching center to obtain the roaming number of the called user B from the HLR. The specific implementation is: the CRBT service SCP sends a LOCREQ message to the HLR to which the called user B belongs to request to obtain the called user The roaming number TLDN of B, the HLR obtains the roaming number TLDN of the called user B from the mobile switching center where the called user B is located through the ROUTREQ message and the routreq message, and the HLR uses the LOCREQ response message (locreq) to return the subscriber B's roaming number TLDN;

Steps 615 to 617: The SCP of the CRBT service sends an ANLYZD message to the PPC service SCP in imitation of the mobile switching center, wherein the trigger is CDRAA, and the SCP of the PPC service returns an ANLYZD message, and the parameter action code (ActionCode) in the message indicates the PPC service Processing result of the control point: if the action code indicates that the call is to be terminated, the SCP of the CRBT service sends an anlyzd message to the mobile switching center of the calling user A, instructing the mobile switching center of the calling user A to end the call, and then end the CRBT service If the parameter action code in this message indicates that the call is continued, the SCP of the color ring service sends an anlyzd message to the mobile switching center, indicating that the mobile switching center of the calling user A continues to call, and sends the anlyzd message to the calling user A's mobile switching center by the anlyzd message The mobile switching center issues the diversion number: CRBT service access code + roaming number, so as to realize the number change through ADVANCED;

Step 618: the mobile switching center where calling user A is located connects the call to the color ring back tone service server, and its specific implementation is: the mobile switching center where calling user A is located analyzes the diverting number in the diverting number according to the diverting number obtained in step 617 The routing address of the CRBT service access code is the CRBT service server, and the mobile switching center sends an initial address message to the CRBT service server to connect the call to the CRBT service server, wherein the called number in the message is the CRBT service access code + roaming number, the calling number is the number of user A;

Step 619: According to the CRBT service access code in the called number in the initial address message in step 618 and the number of the called user B as the original called number, the CRBT service server analyzes that the called user B has registered the CRBT service. The service server sends an initial address message to the mobile switching center where the called user B is located. The called number in the message is the roaming number TLDN, and the calling number is the number of the calling user A, so that the call is connected to the mobile switching center where the called user B is located. mobile switching center;

Step 620: the mobile switching center of the called user B judges the current state of the called user B, if the called user B is idle, then execute step 621 and its subsequent steps, otherwise, execute step 635;

Step 621: The mobile switching center where the called user B is located initiates paging to the mobile station of the called user B, establishes a call with the mobile station of the called user B, and makes the mobile station of the called user B perform, for example, vibrate The prompt action of the bell;

Step 622: The mobile switching center where the called user B is located sends a complete address message to the CRBT service server, and the parameters in the message indicate that the called user B is currently idle;

Step 623: The CRBT service server analyzes the full address message sent in step 622 to obtain that the called user B is currently idle, and according to the pre-customized CRBT service information of the called user B, the CRBT service server plays the customized reply to the calling user A. ring tone, and send a full address message to the mobile switching center where the calling user A is located, to establish a call connection between the calling user A and the called user B;

Steps 624 to 626: The called user B picks up the phone to answer, and the mobile switching center where the called user B is located sends a TANSWER message to the SCP of the PPC service to notify the SCP of the PPC service to perform operations such as charging, and the called user B The mobile switching center where B is located sends a response message to the CRBT service server;

Step 627: After receiving the response message sent in step 626, the CRBT service server stops playing the ring back tone to calling user A, and sends a response message to the mobile switching center where calling user A is located, and calling user A Normal conversation with called user B;

Steps 628 to 634: both parties in the call hang up, release the trunk call between the calling user A and the called user B, and the CRBT service ends;

Steps 635 to 640: Steps 635 to 640 are the steps performed when the called user B is in a busy state. The mobile switching center where the called user B is located plays a busy tone or other prompts to the calling user, and then releases the calling and called party. The trunk call between them, the CRBT service ends.

Embodiment 5: MSC supports CDRAA number change, HLR does not support different triggers to subscribe to different SCPs; in the embodiment of the present invention, because HLR does not support different triggers to subscribe to different SCPs, therefore, in order to realize the ring back tone service, only the The SCP address in all triggers is set as the SCP address of the CRBT service, thereby realizing that the called user B subscribes to the CRBT service, and is set on the SCP of the CRBT service, so that between the mobile switching center and the SCP of the PPC service The messages of all are forwarded through the SCP of the color ring service, referring to Fig. 7, the following steps are needed to realize the present invention:

Step 701: Calling user A calls called user B. Since calling user A and called user B are in different mobile switching centers in the embodiment of the present invention, calling user A is in the mobile The switching center starts the called process; in other embodiments of the present invention, if the calling user A and the called user B are located in the same mobile switching center, then start the called process at the mobile switching center;

Steps 702 to 703: The mobile switching center where the calling user A is located sends a location request (LOCREQ) message to the HLR to which the called user B belongs to request the subscription information of the called user B. After the HLR receives the request, Find the subscription information of user B, and return the subscription information of user B to the mobile switching center of calling user A through the locreq message;

Steps 704 to 705: The called process detects the Initial_Termination trigger. Since the SCP address of each trigger in the called process has been changed to the SCP address of the CRBT service, after the trigger is triggered, the The mobile switching center of the mobile switching center sends the ANLYZD message to the SCP of the CRBT service, and after receiving the message, the SCP of the CRBT service forwards the ANLYZD message to the SCP of the PPC service;

Steps 706 to 707: After receiving the ANLYZD message, the SCP of the PPC service authenticates the called user B. After the authentication is passed, the SCP of the PPC service sends the call to the mobile switching center of the calling user A through the SCP of the CRBT service. Return analysis information response (anlyzd) message, instruct the mobile switching center of calling user A to continue calling;

Steps 708 to 711: The mobile switching center of the calling user A sends a LOCREQ message to the HLR of the called user B to request the roaming number (TLDN) of the called user B, and the HLR of the called user B receives the message Afterwards, send a ROUTREQ message to the visited mobile switching center of the called user B to request to obtain the roaming number of the called user B from the visited mobile switching center, and the visited mobile switching center allocates a TLDN for the called user, And this TLDN is returned to the belonging HLR of called user B by routreq message, and this HLR returns the TLDN of called user B to the mobile switching center of calling user A by LOCREQ response message (locreq) again;

Step 712: The mobile switching center of calling user A detects a CDRAA trigger, wherein the SCP address of the CDRAA trigger has been modified to the address of the SCP of the CRBT service, and the mobile switching center of calling user A triggers the CDRAA trigger , sending an ANLYZD message to the SCP of the CRBT service according to the SCP address in the trigger, so as to issue a new routing number by using the CDRAA number change in the following steps 713 to 715;

Steps 713 to 714: the SCP of the CRBT service forwards the received ANLYZD message to the SCP of the PPC service, and the SCP of the PPC service returns the ANLYZD response message (anlyzd) to the SCP of the CRBT service after receiving the ANLYZD message; wherein, the The onlyzd message is the response message of the ANLYZD message of step 713, and the parameter action code (ActionCode) carried in the anylyzd message is used to represent the processing result of the SCP of the PPC service;

Step 715: After receiving the anlyzd message sent by the SCP of the PPC service in the step 714, the SCP of the CRBT service sends the ANLYZD response message (anlyzd) to the mobile switching center of the calling user A according to the parameter action code in the message, to Instruct the mobile switching center of calling user A to perform corresponding operations according to the processing result of the SCP of the PPC service: if the parameter action code carried in the anlyzd message sent in step 714 indicates that the processing result of the SCP of the PPC service is to continue calling Processing, then in this step, the SCP of CRBT service sends an anlyzd message to the mobile switching center of calling user A, then executes step 716 and subsequent steps thereof, and the parameter action code in the anlyzd message sent in this step is used to indicate this The mobile switching center continues the call, and also sends the diversion number to the mobile switching center of the called user A through the anlyzd message: the access code of the CRBT service + the roaming number of the called user, wherein the routing address of the CRBT service access code is The address of the CRBT service server, and the roaming number of the called user is the temporary local directory number (TLDN) of the called user; if the parameter action code carried in the anlyzd message sent in the step 714 represents the processing result of the SCP of the PPC service For ending the call, then in this step, the SCP of the CRBT service sends an anlyzd message to the mobile switching center of calling user A, to indicate that this mobile switching center ends the call, and ends the entire call processing flow; wherein, the anlyzd message in this step Be the response message of the ANLYZD message of step 712;

Steps 716 to 719: the SCP of the PPC service exchanges the CCDIR and the CCDIR response message (ccdir) with the mobile switching center of the calling user A through the SCP of the CRBT service, and utilizes the message interaction to realize call monitoring before the conversation;

Step 720: The mobile switching center of calling user A connects the call to the ring back tone service server according to the diverting number in the anlyzd message sent in step 715, which is specifically implemented as: the mobile switching center of calling user A according to the redirection number in step 715 The redirection number in the anlyzd message sent in the analysis shows that the routing address of the CRBT service access code is the address of the CRBT service server, and the mobile switching center of the calling user A sends an initial address message to the CRBT service server, and the called party in the message The number is the access code of the CRBT service + the roaming number of the called user, and the calling number in the message is the number of the calling user A;

Step 721: The CRBT service server connects the call to the mobile switching center where the called user B is located, which is specifically implemented as: the CRBT service access code in the called number of the initial address message sent by the CRBT service server according to the initial address message sent in step 720 and as The number of user B of the original called number is analyzed to obtain that user B has registered for the CRBT service. Then, the CRBT service server sends an initial address message to the mobile switching center of the visited place of user B, and the called number in the message is that in step 715 The roaming number of the called user B in the diverted number, the calling number of the message is the number of the calling user A, and according to the called number, the message is sent to the mobile switching center where the called user B is located, so that The call is connected to the mobile switching center where the called user B is located;

Step 722: the mobile switching center where the called user B is located judges the status of the called user B, if the called user B is in an idle state, then execute step 723 and its subsequent steps, otherwise, execute step 740;

Steps 723 to 724: A call is established between the mobile switching center where the called user B is located and the called user B, the mobile station of the called user B rings, and the mobile switching center of the called user B returns the full address to the CRBT service server. message, indicating that the called user B is in an idle state to the ring-back tone server through the parameters carried in the message;

Step 725: The CRBT service server analyzes the full address message returned by the mobile switching center of the called user B, and determines from the analysis result that the called user B is in an idle state, and the CRBT service server according to the CRBT service information customized by the called user B in advance, Play a customized ring back tone to the calling user A, and at the same time, the CRBT service server sends a full address message to the mobile switching center where the calling user A is located, so as to establish a call between the called user B and the calling user A via the CRBT service server. call;

Steps 726 to 729: The called user B picks up the phone to answer, the visited mobile switching center where the called user B is located sends a TANSWER message to the SCP of the CRBT service, and the SCP of the CRBT service forwards the TANSWER message to the SCP of the PPC service to Notify the SCP of the PPC service to start billing, and the visited mobile switching center where the called user B is located sends a response message to the CRBT service server;

Step 730: After receiving the response message, the CRBT service server stops playing the ring back tone to the calling user A, and sends a response message to the calling user A, and connects the call path between the calling user A and the called user B, Calling user A and called user B use this channel to talk;

Steps 731 to 735: calling user A or called user B hangs up, and releases the trunk channel between calling user A or called user B and the SCP of the PPC service; in the embodiment of the present invention, the called user B On-hook as an example, when called user B hangs up, the mobile switching center where called user B is located sends a TDISCONNECT message to the SCP of the CRBT service, and the SCP of the CRBT service forwards the TDISCONNECT message to the SCP of the PPC service, and the SCP of the PPC service receives the TDISCONNECT message. After the TDISCONNECT message, return the TDISCONNECT response message (tdisconnect) to the mobile switching center where the called user B is located through the SCP of the color ring back tone service;

Steps 736 to 739: The mobile switching center where the called user B is located sends a release message to the mobile switching center where the calling user A is located via the CRBT service server, and the mobile switching center where the calling user A is located sends a release message to the called user via the CRBT service server The mobile switching center where B is located returns a release success message, thereby releasing the trunk voice path between the calling user A and the called user B, and then ending the CRBT service flow;

In other embodiments of the present invention, when the calling user A hangs up, the process of releasing the trunk voice path between the calling user and the called user is similar to the process described in the above steps 731 to 739;

Step 740～step 745: Step 740～step 745 is the step that is executed when the called user B is in the busy state, after judging in step 722 that the called user B is in the busy state, The center sends a full address message to the mobile switching center where the calling user A is located through the color ring service server, and directly plays a busy tone or other prompts to the calling user A, and then uses the release message and the release completion message of steps 740 to 745 to release the caller. The trunk call between calling user A and called user B is completed, and then the CRBT service flow is ended.

Embodiment 6: MSC does not support CDRAA number change, and HLR does not support different triggers to sign up to different SCPs; in the embodiment of the present invention, since CDRAA number change is not supported, ADVANCED number change is used to realize the ring back tone service; because HLR does not support different The triggers are signed to different SCPs. Therefore, in order to realize the CRBT service, the SCP addresses in all triggers can only be set as the SCP addresses of the CRBT service, so as to realize that the called user B signs the CRBT service, and in the CRBT service Set up on the SCP, make the message between the mobile switching center and the SCP of PPC service all transmit through the SCP of CRBT service, referring to Fig. 8, realizing the present invention needs the following steps:

Step 801: Calling user A calls called user B. Since calling user A and called user B are in different mobile switching centers in the embodiment of the present invention, calling user A is in the mobile The switching center starts the called process; in other embodiments of the present invention, if the calling user A and the called user B are located in the same mobile switching center, then start the called process at the mobile switching center;

Steps 802 to 803: The mobile switching center where the calling user A is located sends a location request (LOCREQ) message to the HLR to which the called user B belongs to request the subscription information of the called user B. After the HLR receives the request, Find the subscription information of user B, and return the subscription information of user B to the mobile switching center of calling user A through the locreq message;

Steps 804 to 805: The called process detects the Initial_Termination trigger. Since the SCP address of the Initial_Termination trigger has been changed to the SCP address of the CRBT service, after the trigger is triggered, the mobile switching center where the calling user A is located sends The SCP of the CRBT service sends the ANLYZD message. After receiving the message, the SCP of the CRBT service authenticates the called user B. After the authentication is passed, the SCP of the CRBT service judges that the trigger flag of the CRBT service on itself is cleared. This trigger needs to carry out the color ring service, at first set the trigger flag of the color ring service on itself, to indicate that the color ring service SCP carries out the color ring service, then, return the anlyzd message to the mobile switching center where the calling user A is located, in the message The trigger list parameter contains the Advanced_Termination trigger;

Steps 806 to 807: The mobile switching center where the calling user A is located triggers the Advanced_Termination trigger and sends the ANLYZD message to the SCP of the CRBT service. After receiving the message, the SCP of the CRBT service uses ADVANCED to change the number and sends it to the mobile switching center Diverting number, the diverting number is: CRBT service access code + number (MDN) of called user B;

Step 808: The mobile switching center where the calling user A is located connects the call to the CRBT service server according to the redirection number issued in step 807. The routing address of the CRBT service access code is the CRBT service server. The mobile switching center sends an initial address message to the CRBT service server. The called number in the message is the CRBT service access code+the number of called user B. The calling number is the number of the calling user A, and the initial address message is used to connect the call to the ring back tone service server;

Step 809: According to the CRBT service access code in the called number of the initial address message sent in step 808 and the number of the called user B as the original called number, the CRBT service server analyzes and obtains that the called user B has registered the CRBT Then, the CRBT service server sends an initial address message to the mobile switching center where the called user B is located, so as to connect the call to the mobile switching center where the called user B is located, wherein the called number of the initial address message is called The number of user B, the calling number is the number of calling user A;

Step 810～step 811: the mobile switching center where called user B is located obtains the subscription information of called user B from the HLR of called user B by the LOCREQ message and the response message (locreq) of the LOCREQ message;

Step 812: The mobile switching center where the called user B is located triggers the Initial_Termination trigger in the subscription information, and sends the ANLYZD message to the SCP of the CRBT service;

Step 813: After receiving the ANLYAD message, the SCP of the CRBT service authenticates the called party. After the authentication is passed, since the SCP of the CRBT service has set the trigger flag of the CRBT service of the called user in step 804, therefore, The SCP of the CRBT service triggers the PPC service process of the called user B, first clears the trigger flag of the CRBT service, and then, the SCP of the CRBT service sends a SEARCH message to the HLR of the called user B to request to obtain the PPC service of the called user B the SCP address;

Step 814: the HLR of the called user B returns the SCP address of the PPC service of the called user B to the SCP of the CRBT service through the response message (search) of SEARCH;

Steps 815 to 816: The SCP of the CRBT service forwards the ANLYZD message received in step 804 to the SCP of the PPC service according to the SCP address of the PPC service returned in the step 814. After receiving the message, the SCP of the PPC service sends the CRBT message The SCP of the business returns the response message (anlyzd) of ANLYZD, and the action code parameter of the anlyzd message is used to represent the processing result of the SCP of the PPC business;

Step 817: If the action code parameter in the onlyzd message in step 816 indicates that the call is terminated, then the SCP of the color ring back tone service sends an onlyzd message to the mobile switching center where the calling user A is located, instructing the mobile switching center to end the call processing, and then end this call Color ring service; if the action code parameter in the anlyzd message in the step 816 represents continuing to call, then the SCP of the color ring service sends the onlyzd message to the mobile switching center where calling user A is located, and indicates that the mobile switching center finishes continuing the call process, and then executes the steps 818 and its subsequent steps;

Steps 818 to 819: The mobile switching center where the called user B is located sends a LOCREQ message to the HLR to which the called user B belongs, to request to obtain the roaming number of the called user B, and the HLR judges according to the LOCREQ message to obtain the user who sent the message The mobile switching center and the mobile switching center where the called user B is currently located are the same mobile switching center, and the HLR returns a LOCREQ response message (locreq) to the mobile switching center where the called user B is located, and the locreq message includes the called user. The mobile switching center identification (MSCID) parameter of the mobile switching center where B is located, and the mobile switching center analyzes that its own MSCID is identical with the MSCID where the called user B is obtained from the HLR, and directly distributes a TLDN for the called user B;

Steps 820 to 821: The mobile switching center where the called user B is located detects the CDRAA trigger. Since the SCP address corresponding to the CDRAA trigger is the SCP address of the CRBT service, after the trigger is triggered, the called user B's location The mobile switching center of the CRBT service sends the ANLYZD message to the SCP of the CRBT service, and after receiving the message, the SCP of the CRBT service forwards the message to the SCP of the PPC service;

Step 822～step 823: after the SCP of PPC service receives the ANLYZD message sent in step 821, analyze this message, then through the SCP of CRBT service, return the response message (anlyzd) of ANLYZD to the mobile switching center of called user B ), the parameter action code in the anlyzd message is used to represent the result of the SCP of the PPC service processing, if the processing result is to terminate the call, after the mobile switching center of the called user B receives the anlyzd message, end the call processing, And end this color ring back tone service process; If the processing result is to continue calling, after the mobile switching center of called user B receives the anlyzd message, execute step 824 and subsequent steps thereof;

Step 824: the mobile switching center of the called user B judges the current state of the called user B, if the called user B is idle, then execute step 825 and its subsequent steps, otherwise, execute step 838;

Step 825: The mobile switching center where the called user B is located initiates paging to the mobile station of the called user B, establishes a call with the mobile station of the called user B, and makes the mobile station of the called user B perform, for example, vibrate The prompt action of the bell;

Step 826: The mobile switching center where the called user B is located sends a complete address message to the CRBT service server, and the parameters in the message indicate that the called user B is currently idle;

Step 827: The CRBT service server analyzes the full address message sent in step 826 to obtain that the called user B is currently idle, and according to the pre-customized CRBT service information of the called user B, the CRBT service server plays the customized reply to the calling user A. ring tone, and send a full address message to the mobile switching center where the calling user A is located, to establish a call connection between the calling user A and the called user B;

Steps 828 to 831: The called user B picks up the phone to answer, the mobile switching center where the called user B is located sends a TANSWER message to the SPC of the CRBT service, and the SCP of the CRBT service forwards the TANSWER message to the SCP of the PPC service to notify the PPC The SCP of the service performs operations such as charging, and the mobile switching center where the called user B is located sends a response message to the CRBT service server;

Step 832: After receiving the response message sent in step 831, the CRBT service server stops playing the ring back tone to calling user A, and sends a response message to the mobile switching center where calling user A is located, and calling user A Normal conversation with called user B;

Steps 833 to 838: both parties in the call hang up, release the trunk channel between the calling user A and the called user B, and the CRBT service ends;

Steps 839 to 841: Steps 839 to 841 are the steps executed when the called user B is in a busy state. The mobile switching center where the called user B is located plays a busy tone or other prompts to the calling user, and then releases the caller and called party. The trunk call between them, the CRBT service ends.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (20)

1. realize the method for Ring Back Tone service in the code division multiple access system, it is characterized in that the address of the corresponding trigger in the user signing contract information of the IN service of will having contracted in advance is from the address that the IN service SCP address is revised as Ring Back Tone service SCP, this method comprises:

Steps A: calling subscriber's Mobile Origination is to called subscriber's calling, the mobile switching centre at calling subscriber place obtains this called subscriber's CAMEL-Subscription-Information, according to the trigger address in the CAMEL-Subscription-Information, Ring Back Tone service SCP transmits between mobile switching centre and the IN service SCP corresponding signaling realization IN service and Ring Back Tone service and will call out via server of color ring back tone service by the number of changing and is routed to the called subscriber at last;

Step B: server of color ring back tone service is play the ring-back tone of customization in advance to the calling subscriber when the called subscriber is idle condition.

2. method according to claim 1 is characterized in that, described corresponding trigger comprises that at least called routing address can use trigger;

Steps A comprises:

Steps A 11: the mobile switching centre at calling subscriber place obtains called subscriber's CAMEL-Subscription-Information from the HLR of called subscriber's ownership, trigger the initial terminal trigger in this CAMEL-Subscription-Information, trigger intelligent business arrives IN service SCP, and obtains called subscriber's roaming number from the HLR of called subscriber's ownership;

Steps A 12: the mobile switching centre at calling subscriber place utilizes described called routing address can use trigger, trigger Ring Back Tone service, and transmitting mobile switching centre and the analysis message between the IN service SCP and the analyzing responding message at calling subscriber place via Ring Back Tone service SCP, IN service SCP and Ring Back Tone service SCP realize IN service and Ring Back Tone service respectively; Can obtain to comprise at least the transferred number of Ring Back Tone service access code and called subscriber's roaming number with the mobile switching centre at calling subscriber place with the trigger number of changing by called routing address;

Steps A 13: the mobile switching centre at calling subscriber place arrives server of color ring back tone service according to the Ring Back Tone service access code in this transferred number with call proceeding, then, will call out the mobile switching centre that is routed to the called subscriber place by server of color ring back tone service according to the called subscriber's roaming number in the transferred number.

3. method according to claim 2 is characterized in that, steps A 11 comprises:

Steps A 111: the mobile switching centre at calling subscriber place sends location request message to the HLR of called subscriber's ownership, after this HLR receives this message, called subscriber's CAMEL-Subscription-Information is returned to the mobile switching centre at calling subscriber place by position request response message;

Steps A 112: the mobile switching centre at calling subscriber place is according to the trigger information in the called user subscription information, trigger the initial terminal trigger, send analysis message to IN service SCP, IN service SCP receives this analysis message, the called subscriber is carried out authentication, after authentication was passed through, the mobile switching centre to the calling subscriber place returned analyzing responding message, and indication calling subscriber mobile switching centre continues call treatment;

Steps A 113: the mobile switching centre at calling subscriber place sends location request message to the HLR of called subscriber's ownership, after this HLR receives this message, obtain called subscriber's roaming number by route request information and route requests response message from called subscriber's visit ground mobile switching centre, by position request response message this roaming number is returned to the mobile switching centre at calling subscriber place then.

4. method according to claim 2 is characterized in that, described corresponding trigger is whole triggers, and steps A 11 comprises:

Step a111: the mobile switching centre at calling subscriber place sends location request message to the HLR of called subscriber's ownership, after this HLR receives this message, called subscriber's CAMEL-Subscription-Information is returned to the mobile switching centre at calling subscriber place by position request response message;

Step a112: the mobile switching centre at calling subscriber place is according to the trigger information in the called user subscription information, trigger the initial terminal trigger, send analysis message through Ring Back Tone service SCP to IN service SCP, IN service SCP receives this analysis message, the called subscriber is carried out authentication, after authentication is passed through, transmit through Ring Back Tone service SCP, mobile switching centre to the calling subscriber place returns analyzing responding message, and indication calling subscriber mobile switching centre continues to call out;

Step a113: the mobile switching centre at calling subscriber place sends location request message to the HLR of called subscriber's ownership, after this HLR receives this message, obtain called subscriber's roaming number by route request information and route requests response message from called subscriber's visit ground mobile switching centre, by position request response message this roaming number is returned to the mobile switching centre at calling subscriber place then.

5. method according to claim 2 is characterized in that, steps A 12 comprises:

Steps A 121: the mobile switching centre at calling subscriber place triggers called routing address can use trigger, trigger Ring Back Tone service, the mobile switching centre at calling subscriber place sends to Ring Back Tone service SCP and analyzes message, Ring Back Tone service SCP utilizes query messages and query response message to obtain the address of IN service SCP from the HLR of called subscriber's ownership, then, the analysis forwards that the mobile switching centre at calling subscriber place in this step sent according to the IN service SCP address that obtains of Ring Back Tone service SCP is to IN service SCP;

Steps A 122: IN service SCP returns analyzing responding message via the mobile switching centre of Ring Back Tone service SCP to the calling subscriber place, comprises described transferred number in this analyzing responding message.

6. method according to claim 5 is characterized in that, further comprises the action code of handling the IN service result in order to expression IN service SCP described in the steps A 122 in the analyzing responding message, if this action code indication continues to call out, then carry out described steps A 13, otherwise, process ends.

7. method according to claim 1 is characterized in that, described corresponding trigger comprises that at least called routing address can use trigger;

When the mobile switching centre at the mobile switching centre at calling subscriber place and called subscriber place was same mobile switching centre, steps A comprised:

Steps A 21: the mobile switching centre at calling subscriber and called subscriber place triggers the initial terminal trigger in this CAMEL-Subscription-Information, trigger intelligent business from the CAMEL-Subscription-Information that the HLR of called subscriber's ownership obtains the called subscriber;

Steps A 22: the mobile switching centre at calling subscriber and called subscriber place utilizes described called routing address can use trigger, trigger Ring Back Tone service, and via the mobile switching centre at Ring Back Tone service SCP forwarding calling subscriber place and the analysis message between the IN service SCP, IN service SCP returns analyzing responding message to Ring Back Tone service SCP, Ring Back Tone service SCP copies mobile switching centre from the roaming number that the HLR of called subscriber's ownership obtains the called subscriber, will comprise at least that then the transferred number of Ring Back Tone service access code and called subscriber's roaming number sends to the mobile switching centre at calling subscriber and called subscriber place.

8. method according to claim 7 is characterized in that, steps A 21 comprises:

Steps A 211: the mobile switching centre at calling subscriber place sends location request message to the HLR of called subscriber's ownership, after this HLR receives this message, called subscriber's CAMEL-Subscription-Information is returned to the mobile switching centre at calling subscriber place by position request response message;

Steps A 212: the mobile switching centre at calling subscriber place is according to the trigger information in the called user subscription information, trigger the initial terminal trigger, send analysis message to IN service SCP, IN service SCP receives this analysis message, the called subscriber is carried out authentication, after authentication was passed through, the mobile switching centre to the calling subscriber place returned analyzing responding message, and indication calling subscriber mobile switching centre continues to call out;

Steps A 213: the mobile switching centre at calling subscriber place sends location request message to the HLR of called subscriber's ownership, after this HLR receives this message, MSCID according to the mobile switching centre at the calling subscriber place of carrying in this message judges that the MSCID of the mobile switching centre that obtains the calling subscriber place is identical with the MSCID of the mobile switching centre at called subscriber place, and this HLR returns to the MSCID of the mobile switching centre at called subscriber place by position request response message the mobile switching centre at calling subscriber and called subscriber place.

9. method according to claim 7 is characterized in that, steps A 22 comprises:

Steps A 221: the mobile switching centre at calling subscriber place triggers called routing address can use trigger, trigger Ring Back Tone service, the mobile switching centre at calling subscriber place sends to Ring Back Tone service SCP and analyzes message, Ring Back Tone service SCP utilizes query messages and query response message to obtain the address of IN service SCP from the HLR of called subscriber's ownership, then, the analysis forwards that the mobile switching centre at calling subscriber place in this step sent according to the IN service SCP address that obtains of Ring Back Tone service SCP is to IN service SCP;

Steps A 222: IN service SCP returns analyzing responding message to Ring Back Tone service SCP, wherein, comprises the action code of handling the IN service result in order to expression IN service SCP in this analyzing responding message at least;

Steps A 223: Ring Back Tone service SCP copies mobile switching centre to send location request message to the HLR of called subscriber's ownership, after this HLR receives this message, from the roaming number that called subscriber's visit ground mobile switching centre obtains the called subscriber, by position request response message this roaming number is returned to Ring Back Tone service SCP by route request information and route requests response message then;

Steps A 224: Ring Back Tone service SCP returns the response message of analyzing message in the step 221 to the mobile switching centre at calling subscriber place, comprises steps A 222 described action codes and described transferred number in this analyzing responding message at least.

10. method according to claim 1 is characterized in that, described corresponding trigger comprises the initial terminal trigger at least;

Steps A comprises:

Steps A 31: the mobile switching centre at calling subscriber place obtains called subscriber's CAMEL-Subscription-Information from the HLR of called subscriber's ownership, trigger the initial terminal trigger in this CAMEL-Subscription-Information, send analysis message to Ring Back Tone service SCP, Ring Back Tone service SCP realizes Ring Back Tone service, with utilize senior terminating trigger, make the mobile switching centre at calling subscriber place obtain to comprise at least the transferred number of Ring Back Tone service access code and called number;

Steps A 32: the mobile switching centre that is routed to the called subscriber via server of color ring back tone service will be called out according to transferred number by the mobile switching centre at calling subscriber place;

Steps A 33: called subscriber's mobile switching centre obtains called subscriber's CAMEL-Subscription-Information from the HLR of called subscriber's ownership, trigger the initial terminal trigger in this CAMEL-Subscription-Information, called subscriber's mobile switching centre sends to IN service SCP through Ring Back Tone service SCP and analyzes message, and IN service SCP realizes IN service.

11. method according to claim 10 is characterized in that, steps A 31 comprises:

Steps A 311: the mobile switching centre at calling subscriber place sends location request message to the HLR of called subscriber's ownership, after this HLR receives this message, called subscriber's CAMEL-Subscription-Information is returned to the mobile switching centre at calling subscriber place by position request response message;

Steps A 312: the mobile switching centre at calling subscriber place triggers the initial terminal trigger in the called user subscription information, sends to Ring Back Tone service SCP and analyzes message;

Steps A 313: Ring Back Tone service SCP to called subscriber's authentication after, Ring Back Tone service is set on this SCP triggers sign, mobile switching centre to the calling subscriber place returns analyzing responding message then, comprises senior terminating trigger in the list of triggers parameter in this message;

Steps A 314: the mobile switching centre at calling subscriber place triggers senior terminating trigger, send analysis message to Ring Back Tone service SCP, Ring Back Tone service SCP will comprise at least that by analyzing responding message the transferred number of Ring Back Tone service access code and called number sends to the mobile switching centre at calling subscriber place.

Steps A 33 comprises:

Steps A 331: called subscriber's mobile switching centre sends location request message to the HLR of called subscriber's ownership, after this HLR receives this message, called subscriber's CAMEL-Subscription-Information is returned to called subscriber's mobile switching centre by position request response message;

Steps A 332: called subscriber's mobile switching centre triggers the initial terminal trigger in this CAMEL-Subscription-Information, send analysis message to Ring Back Tone service SCP, Ring Back Tone service SCP removes Ring Back Tone service and triggers sign, then, Ring Back Tone service SCP utilizes query messages and query response message to obtain the address of IN service SCP from the HLR of called subscriber's ownership, then, Ring Back Tone service SCP according to the IN service SCP address that obtains with the called subscriber sent in this step analysis forwards to IN service SCP;

Steps A 333: IN service SCP sends analyzing responding message via the mobile switching centre of Ring Back Tone service SCP to the calling subscriber place, comprises the action code of handling the IN service result in order to expression IN service SCP in this analyzing responding message; With called subscriber's mobile switching centre by location request message and position request response message from the HLR of called subscriber's ownership information, according to this information acquisition called subscriber's roaming number with obtaining the current visit of called subscriber; Trigger called routing address with called subscriber's mobile switching centre and can use trigger, send analysis message to IN service SCP, IN service SCP returns analyzing responding message to called subscriber's mobile switching centre, comprises the action code of handling the IN service result in order to expression IN service SCP in this message.

12. method according to claim 10 is characterized in that, described corresponding trigger is whole triggers, and steps A 31 comprises:

Step a311: the mobile switching centre at calling subscriber place sends location request message to the HLR of called subscriber's ownership, after this HLR receives this message, called subscriber's CAMEL-Subscription-Information is returned to the mobile switching centre at calling subscriber place by position request response message;

Step a312: the mobile switching centre at calling subscriber place triggers the initial terminal trigger in the called user subscription information, sends to Ring Back Tone service SCP and analyzes message;

Step a313: Ring Back Tone service SCP to called subscriber's authentication after, Ring Back Tone service is set on this SCP triggers sign, mobile switching centre to the calling subscriber place returns analyzing responding message then, comprises senior terminating trigger in the list of triggers parameter in this message;

Step a314: the mobile switching centre at calling subscriber place triggers senior terminating trigger, send analysis message to Ring Back Tone service SCP, Ring Back Tone service SCP will comprise at least that by analyzing responding message the transferred number of Ring Back Tone service access code and called number sends to the mobile switching centre at calling subscriber place.

Steps A 33 comprises:

Step a331: called subscriber's mobile switching centre sends location request message to the HLR of called subscriber's ownership, after this HLR receives this message, called subscriber's CAMEL-Subscription-Information is returned to called subscriber's mobile switching centre by position request response message;

Step a332: called subscriber's mobile switching centre triggers the initial terminal trigger in this CAMEL-Subscription-Information, send analysis message to Ring Back Tone service SCP, Ring Back Tone service SCP removes Ring Back Tone service and triggers sign, then, Ring Back Tone service SCP utilizes query messages and query response message to obtain the address of IN service SCP from the HLR of called subscriber's ownership, then, Ring Back Tone service SCP according to the IN service SCP address that obtains with the called subscriber sent in this step analysis forwards to IN service SCP;

Step a333: IN service SCP sends analyzing responding message via the mobile switching centre of Ring Back Tone service SCP to the calling subscriber place, comprises the action code of handling the IN service result in order to expression IN service SCP in this analyzing responding message; With called subscriber's mobile switching centre by location request message and position request response message from the HLR of called subscriber's ownership information, according to this information acquisition called subscriber's roaming number with obtaining the current visit of called subscriber; Trigger called routing address with called subscriber's mobile switching centre and can use trigger, transmit via Ring Back Tone service SCP, send analysis message to IN service SCP, IN service SCP transmits via Ring Back Tone service SCP, mobile switching centre to the called subscriber returns analyzing responding message, comprises the action code of handling the IN service result in order to expression IN service SCP in this message.

13. method according to claim 1 is characterized in that, described corresponding trigger comprises the initial terminal trigger at least;

Steps A comprises:

Steps A 41: the mobile switching centre at calling subscriber place obtains called subscriber's CAMEL-Subscription-Information from the HLR of called subscriber's ownership, trigger the initial terminal trigger in this CAMEL-Subscription-Information, Ring Back Tone service SCP transmits mobile switching centre and the analysis message between the IN service SCP and the analyzing responding message at calling subscriber place, realizes IN service;

Steps A 42: the mobile switching centre at calling subscriber place triggers senior terminating trigger, send analysis message to Ring Back Tone service SCP, Ring Back Tone service SCP copies the roaming number of mobile switching centre by the HLR acquisition called subscriber of called subscriber's ownership, and Ring Back Tone service SCP will comprise at least that the transferred number of Ring Back Tone service access code and called subscriber's roaming number sends to the mobile switching centre at calling subscriber place;

Steps A 43: the mobile switching centre at calling subscriber place arrives server of color ring back tone service according to the Ring Back Tone service access code in this transferred number with call proceeding, then, will call out the mobile switching centre that is routed to the called subscriber place again by server of color ring back tone service according to the called subscriber's roaming number in the transferred number.

14. method according to claim 13 is characterized in that, steps A 41 comprises:

Steps A 411: the mobile switching centre at calling subscriber place sends location request message to the HLR of called subscriber's ownership, after this HLR receives this message, called subscriber's CAMEL-Subscription-Information is returned to the mobile switching centre at calling subscriber place by position request response message;

Steps A 412: the mobile switching centre at calling subscriber place triggers the initial terminal trigger in the called user subscription information, sends to Ring Back Tone service SCP and analyzes message;

Steps A 413: Ring Back Tone service SCP utilizes query messages and query response message to obtain the address of IN service SCP from the HLR of called subscriber's ownership, then, Ring Back Tone service SCP according to the IN service SCP address that obtains with the called subscriber sent in the step 412 analysis forwards to IN service SCP;

Step 414: IN service SCP sends analyzing responding message via the mobile switching centre of Ring Back Tone service SCP to the calling subscriber place, comprises the action code of handling the IN service result in order to expression IN service SCP in this analyzing responding message.

15. method according to claim 13 is characterized in that, steps A 42 comprises:

Steps A 421: the mobile switching centre at calling subscriber place triggers senior terminating trigger, sends to Ring Back Tone service SCP and analyzes message;

Steps A 422: Ring Back Tone service SCP copies mobile switching centre to send location request message to the HLR of called subscriber's ownership, after this HLR receives this message, from the roaming number that called subscriber's visit ground mobile switching centre obtains the called subscriber, by position request response message this roaming number is returned to Ring Back Tone service SCP by route request information and route requests response message then;

Steps A 423: Ring Back Tone service SCP triggers called routing address can use trigger, send analysis message to IN service SCP, IN service SCP returns analyzing responding message to Ring Back Tone service SCP, comprises the action code of handling the IN service result in order to expression IN service SCP in this message;

Steps A 424: Ring Back Tone service SCP carries described transferred number to the response message that the mobile switching centre at calling subscriber place returns the analysis message that is sent in the steps A 421 in this message.

16. method according to claim 1 is characterized in that, step B comprises:

The called subscriber mobile switching centre judge called subscriber's current state, if called subscriber's current state is idle, then called subscriber's mobile switching centre sends Address Complete Message via the mobile switching centre of server of color ring back tone service to the calling subscriber place, the calling of setting up between calling subscriber and the called subscriber connects, server of color ring back tone service is play the ring-back tone of customization in advance, called subscriber's travelling carriage ring to the calling subscriber.

17. method according to claim 16 is characterized in that, if called subscriber's current state is busy, this method further comprises:

Called subscriber's visit ground mobile switching centre is directly to the prompt tone of mobile switching centre's play cuing called subscriber busy at calling subscriber place, and discharges the mobile switching centre at calling subscriber place and called subscriber and visit that the speech channel via server of color ring back tone service connects between the ground mobile switching centre.

18. method according to claim 1 is characterized in that, after the step B, this method further comprises:

Step C: called subscriber's off-hook is replied, and server of color ring back tone service stops the playing RBT to the calling subscriber, and calling subscriber and called subscriber converse.

19. method according to claim 18 is characterized in that, after the step C, this method further comprises:

Calling subscriber or called subscriber's on-hook, IN service SCP finishes IN service, and discharges the mobile switching centre at calling subscriber place and called subscriber and visit that the speech channel via server of color ring back tone service connects between the ground mobile switching centre.

20. method according to claim 1 is characterized in that, described IN service comprises CDMA prepayment service or centrex service.

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