CN1964344B - Method and device for call session control - Google Patents

Abstract

The invention discloses a call session control function device, comprising: a message receiving unit, used to receive a call session request message; a detection unit, used to detect whether the session request message received by the message receiving unit includes a called party identifier, And output the corresponding detection results; the first control unit is used to control the session process to execute the called process when the session request message output by the detection unit includes the called party identifier; the second control unit is used to When it is received that the session request message output by the detection unit does not include the called party ID, add the called party ID to the session request message, and control the session process to execute the calling process. The invention also discloses a call session flow control method. By adopting the invention, the purpose of controlling the call session flow in a relatively simple manner is realized.

Description

Method and device for call session control

technical field

The invention relates to the communication field, in particular to a method and device for calling session control functions in the mobile communication field.

Background technique

IP Multimedia Subsystem (IMS, IP Multimedia Subsystem) is a key technology for the evolution of next-generation networks. It is composed of all functional entities that can provide multimedia services, including a collection of functional entities related to signaling and bearer. It supports fixed access and Mobile access combines the development of the Internet with the development of wireless communication to provide multimedia services based on applications, services and protocols. In the development process of the next generation network, it is a new means and development direction of network convergence and service convergence.

At present, IMS is based on the core network packet domain (PS, Packet Switched Domain) of the third generation mobile communication standard (3GPP, 3G Partnership Project), and is used to transmit the session initiation protocol (SIP, Session Initiation Protocol) call control signaling and communication data business. Wherein, the SIP call control signaling will be transmitted between Call Session Control Functions (CSCF, Call Session Control Function) in the IMS architecture according to user configuration. Currently, according to different functions and locations in the network, CSCF is divided into three network elements, proxy CSCF (P-CSCF, Proxy-Call Session Control Function), query CSCF (I-CSCF, Interrogation-Call Session Control Function) And Serving CSCF (S-CSCF, Serving-Call Session Control Function), where:

P-CSCF is the first connection point with users in IMS, providing proxy function, that is, accepting call session requests and forwarding them, and also providing user agent function, that is, interrupting and independently generating call sessions under abnormal circumstances; S-CSCF In the core control position in the IMS core network, it is responsible for user registration authentication and session control, and performs basic session routing functions for calling and called IMS users. When it is satisfied, trigger value-added service routing and service control interaction; I-CSCF is similar to the gateway node of IMS, providing user service node S-CFCS distribution, routing query and IMS inter-domain topology hiding functions; stipulates the call executed at the calling end The session process is the calling process, and the call session process performed at the called end is the called process.

At present, the method of using CSCF to control the call session flow and complete the session routing function and user subscription service includes:

Registration process: P-CSCF sends registration information to S-CSCF, with a called identifier Term in the registration information; when the S-CSCF under the I-CSCF receives the registration information, it will save the called Identify the Term, and bring a caller ID Orig in the registration response message sent back to the P-CSCF; the P-CSCF saves the caller ID Orig from the S-CSCF.

Call flow: When the P-CSCF receives a call session request message, it judges whether the received message includes the called identifier Term, if not, controls the session flow to execute the calling process, and carries it when forwarding the session message. The caller ID Orig saved in the registration phase; otherwise, control the session process to execute the called process; when the S-CSCF receives the session request message, judge whether the received message includes the caller ID Orig, if not, control the session process execution The calling process, otherwise, control the session process to execute the called process, and when forwarding the session message, bring the called party identification Term saved in the registration phase.

In the prior art, three CSCFs, P-CSCF, I-CSCF and S-CSCF, work together to detect the identity of the calling party and the called party during the conversation, and can correctly judge whether the conversation flow is the calling flow or the called flow, and then according to the judgment result , control the session process to execute the calling process or control the session process to execute the called process. However, the implementation of the call session control function in the prior art requires the joint participation of three CSCF network elements, P-CSCF, I-CSCF and S-CSCF, and the implementation method is too complicated, and network maintenance and management are difficult.

Contents of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a call session control function device and a call session flow control method, so as to implement call session flow control in a relatively simple manner.

In order to solve the above technical problems, a call session control function device proposed in an embodiment of the present invention includes:

a message receiving unit, configured to receive a call session request message;

A detection unit, configured to detect whether the session request message received by the message receiving unit includes the called party identifier, and output a corresponding detection result;

A first control unit, configured to control the session process to execute the called process when the detection unit detects that the session request message includes the called party identifier;

The second control unit is configured to, when the detecting unit detects that the called party ID is not included in the session request message, add the called party ID to the session request message, and control the session process to execute the calling process.

Wherein, the detection unit includes a first judging unit and a second judging unit, wherein:

A first judging unit, configured to judge whether the session request message received by the message receiving unit includes a message field for carrying a user identifier and output a first judging result or a second judging result, the first judging result indicating the The called party identifier is not included in the session request message, and the second judgment result indicates that the message field is included in the session request message;

A second judging unit, configured to receive the second judging result, judging whether the message field includes the called identifier and outputting a third judging result or a fourth judging result, the third judging result indicating the session request message The called party ID is included in the message, and the fourth determination result indicates that the called party ID is not included in the session request message.

Wherein, the second control unit includes a first supplementary unit, a second supplementary unit, and a calling control unit, wherein:

A first supplementary unit, configured to add the message field to the session request message and output a first supplementary result when the first judgment result is received, the first supplementary result is a message field including the message field session request message;

A second supplementary unit, configured to add the called party identifier in the message field of the session request message when the first supplementary result and/or the second judgment result is received;

The calling control unit is connected with the second supplementary unit and is used to control the conversation flow and execute the calling flow.

Correspondingly, an embodiment of the present invention also provides a method for controlling a call session process by using the call session control function device, including:

Receiving a call session request message, judging whether the session request message includes the called identifier, if including the called identifier, then controlling the session process to execute the called procedure, if not including the called identifier, then the session request message Add the called ID, and control the session process to execute the calling process.

Wherein, the conditions for determining that the called party identification is included in the session request message include:

The session request message includes a message field for carrying the user identifier, and the address message in the message field includes the called identifier.

Wherein, the conditions for determining that the called party identification is not included in the session request message include:

The session request message does not include a message field for carrying the user identifier, and/or

The session request message includes the message field, and the address message of the message field does not include the called identifier.

Wherein, the step of adding the called party identification for the session request message specifically includes:

When the session request message does not include a message field for carrying a user ID, generating the message field and adding the called party ID in the message field;

When the message field is included in the session request message, the called party identifier is added in the message field.

Wherein, the message field used to carry the user identifier is a routing header field.

Wherein, the execution of the calling process of the control session flow includes controlling the execution of the caller subscription service and controlling the caller route of the session request message; the execution of the callee flow of the control session flow includes control The called route for session request messages.

Wherein, the call session request message is a session initiation protocol message.

Implementing the embodiment of the present invention has the following beneficial effects:

The embodiment of the present invention can correctly judge whether the conversation flow is the calling flow or the called flow by detecting whether the received call session request message includes the called identifier, and then control the conversation flow to execute the calling flow or the called flow according to the judgment result. , implementing call session flow control in a relatively simple manner.

Description of drawings

FIG. 1 is a simplified structural diagram of a call session control function device according to an embodiment of the present invention;

Fig. 2 is a detailed structural diagram of a call session control function device according to an embodiment of the present invention;

FIG. 3 is a flowchart of a control method for a call session flow in an embodiment of the present invention;

Fig. 4 is a schematic diagram of a simplified structure of a call session system according to an embodiment of the present invention.

Detailed ways

IMS is based on the third-generation mobile communication standard 3GPP core network packet domain PS, and is used to transmit call session control signaling and communication data services of the session initiation protocol SIP. Wherein, the call session control signaling is transmitted on the call session control function CSCF in the IMS architecture according to user configuration. Embodiments of the present invention provide a call session control function device and a method for using the device to control a call session. By detecting whether the received call session request message includes the called identifier, it can be correctly judged whether the session flow is a calling flow or a calling flow. The called process then controls the session process to execute the calling process or the called process according to the judgment result, and realizes the call session process control in a relatively simple manner.

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

FIG. 1 is a schematic diagram of a simplified structure of a call session control function device according to an embodiment of the present invention. The call session control function device in this embodiment includes a message receiving unit 10, a detection unit 20, a first control unit 30, and a second control unit 40, wherein:

The message receiving unit 10 is used to receive the call session request message; in a specific implementation, the session request message received by the message receiving unit 10 may come from the call terminal or the call session control function device at the other end. Since the IMS service control uniformly adopts IP-based SIP control protocol, the message receiving unit 10 can communicate directly with the mobile terminal supporting SIP and through media gateway control function (MGCF, MediaGateway Control Function) and IP multimedia-media gateway (IM-MGW, IMS-Media GatewayFunction) and H.323 /BICC/ISUP terminal interworking.

The detection unit 20 is used to detect whether the session request message received by the message receiving unit 10 includes the called identifier, and output the corresponding detection result; the called identifier is a tag used to represent the flow state of the current session flow , in this embodiment, when the detecting unit 20 detects that the called party identifier is included in the session request message, it indicates that the session process is the called process; when the detecting unit 20 detects that the session request message does not When the called party ID is included, it indicates that the session flow is the calling flow. In the 3GPP protocol, the Term is used to indicate the called identity.

The first control unit 30 is configured to control the session process to execute the called process when the detection unit 20 detects that the called party identifier is included in the session request message; When the called identifier is included, it indicates that the conversation flow is the called flow. At this time, the first control unit 30 will control the conversation flow to execute the called flow. The controlling the session flow to execute the called flow includes controlling the execution of the called subscription service and controlling the called routing of the session request message. The called subscription service includes various call session value-added services registered by the called user; the called routing for controlling the session request message is to correctly send the session request message to the called terminal.

The second control unit 40 is configured to add a called identifier to the session request message when the detecting unit 20 detects that the called identifier is not included in the session request message, and control the session flow to execute the calling flow; When the detection unit 20 detects that the called party ID is not included in the session request message, it indicates that the session flow is a calling process. At this time, the second control unit 40 will add the called party ID to the session request message, and then control the session The process executes the calling process. The controlling session process execution calling process includes controlling the execution of the calling subscription service and controlling the calling route of the session request message. The calling subscription service includes various call session value-added services registered by the calling user; the calling route for controlling the session request message is to correctly send the session request message to the peer call session control function device.

FIG. 2 is a detailed structural diagram of a call session control function device according to an embodiment of the present invention; It includes a first supplementary unit 401, a second supplementary unit 402 and a caller control unit 403, wherein:

The first judging unit 201 is configured to judge whether the session request message received by the message receiving unit 10 includes a message field for carrying a user identifier, and output a first judging result or a second judging result, the first judging result Indicating that the called party identifier is not included in the session request message, and the second judgment result indicates that the message field is included in the session request message. The user ID includes a called ID and/or a calling ID. According to the SIP protocol, the call session request message is defined as an Invite message. At the same time, in the 3GPP protocol, the Term is used to represent the called identifier. A method of carrying the called identifier Term is: the called identifier Term is placed in the Invite message. The user name part of the domain name address carried by the Route domain, therefore, when the message receiving unit 10 receives the call session request message Invite message, the first judging unit 201 can determine whether there is a Route domain in the message. Whether the message includes the message field used to carry the user ID.

The second judging unit 202 is configured to receive the second judging result, judge whether the called party identifier is included in the message field, and output a third judging result or a fourth judging result, the third judging result indicating the session request The message includes the called identifier, and the fourth judgment result indicates that the session request message does not include the called identifier. When the first judging unit 201 judges that the received Invite message includes the Route field, it indicates that the The session request message Invite message includes the message field for carrying the user identifier, and the second judging unit 202 is used to further judge whether the message field Route field includes the called identifier Term, and if it is judged to be yes, it indicates that the session process is being called. Call flow, send the judgment result to the first control unit 30, if it judges no, it indicates that the conversation flow is a call flow, and send the judgment result to the second supplementary unit 402, because the called identification Term is placed in The user name part of the domain name address carried in the Route field, therefore, the second judging unit 202 judges whether the user name of the domain name address is Term, and can judge whether the message domain Route field includes the called identifier.

The first supplementary unit 401 is configured to, when receiving the first judgment result, add the message field in the session request message and output a first supplementary result, the first supplementary result includes the message field session request message;

When the first judging unit 201 judges that the session request message Invite message does not include the Route field, indicating that the message does not include the message field for carrying the user ID, the first supplementary unit 401 receives the first When the judging unit 201 judges that the session request message does not include the judgment result of the Route field, it is used to add the Route field to the session request message Invite message, and send the session request message with the message field Route field The Invite message is sent to the second supplementary unit 402 . Adding the Route field also adds a message field for carrying the user ID to the session request message.

The second supplementary unit 402 is configured to add the called party identifier in the message field of the session request message when the first supplementary result and/or the second judgment result is received; When the judging unit 202 judges that the message domain Route field of the session request message Invite message does not include the called identifier Term, it indicates that the session flow is a calling flow, and the judgment result is sent to the second supplementary unit 402, and the second supplementary unit 402 receives When the judgment result of the second judging unit 202 is used to add the called identifier Term in the Route field of the session request message Invite message, the specific method is: the user name part of the domain name address carried in the Route field in the Invite message Use the called identifier Term; when the first supplementary unit 401 adds a Route domain to the session request message Invite message, send the session request message Invite message with the message domain Route domain to the second supplementary unit 402 Afterwards, the second supplementary unit 402 also uses Term in the username part of the domain name address carried in the Route field in the Invite message, so as to add the called identifier Term to the message field Route.

The caller control unit 403 is connected to the second supplementary unit 402 and configured to control the session flow and execute the caller flow. The controlling session process execution calling process includes controlling the execution of the calling subscription service and controlling the calling route of the session request message. The calling subscription service includes various call session value-added services registered by the calling user; the calling route for controlling the session request message is to correctly send the session request message to the peer call session control function device.

Fig. 3 is a flow chart of a control method for a call session process in an embodiment of the present invention; the method of this embodiment uses the above-mentioned call session control function device to control a call session process, and the specific implementation steps of the method in this embodiment are as follows:

Step S100, receiving a call session request message; since the IMS service control uniformly adopts the IP-based SIP control protocol, the session request message received in this step can be a session request message sent by a device supporting the SIP protocol, or a session request message that supports H. 323/BICC/ISUP protocol equipment sent by the Media Gateway Control Function (MGCF, Media Gateway Control Function) and IP Multimedia-Media Gateway (IM-MGW, IMS-Media Gateway Function) is converted into a session request message of the SIP protocol message. According to the SIP protocol, a call session request message is defined as an Invite message.

Step S101, judging whether the received session request message includes a message field for carrying the user ID, if it is judged to be yes, go to step S102; otherwise go to step S103. In the 3GPP protocol, the tag Term is used to represent the called logo A method of carrying the called identification Term is: placing the called identification Term in the username part of the domain name address carried in the Route domain in the Invite message, therefore, when step S100 receives the call session request message Invite message , the step S101 judges whether the message includes the Route field to determine whether the message includes the message field for carrying the user ID.

Step S102, judging whether the message field includes the called identifier, if it is judged yes, go to step S106, and terminate; otherwise, go to step S104. When the step S101 judges that the received Invite message includes the Route field, it indicates that the session request message Invite message includes the message field for carrying the user identifier, and the step S102 is used to further judge the message field Whether comprise called identification Term in the Route domain, because called identification Term is placed in the user name part of the domain name address that Route domain carries, therefore, this step S102 judges whether the user name of domain name address is Term, just can judge described message Whether the called party ID is included in the domain Route.

Step S103, adding a message field for carrying a user identifier to the session request message; when step S101 judges that the session request message Invite message does not include a Route field, it indicates that the message does not include a message field for carrying a user identifier The step S103 is to add a Route field to the session request message Invite message, adding a Route field also adds a message field for carrying a user ID to the session request message.

Step S104, adding the called identifier in the message domain; when the step S102 judges that the message domain Route domain of the session request message Invite message does not include the called identifier Term, it indicates that the conversation flow is a calling flow, the step S104 For adding called identification Term in the Route domain of described session request message Invite message, concrete method is: the user name part of the domain name address that the Route domain in the Invite message carries uses called identification Term; When step S103 is described After the Route field is added to the Invite message of the session request message, the step S104 also uses Term in the username part of the domain name address carried in the Route field in the Invite message, so as to add the called identifier Term to the message field Route.

Step S105, controlling the session process to execute the calling process, and terminating; the controlling the session process to execute the calling process includes controlling the execution of the calling subscription service and controlling the calling route of the session request message. The calling subscription service includes various call session value-added services registered by the calling user; the calling route for controlling the session request message is to correctly send the session request message to the peer call session control function device.

Step S106, controlling the session process to execute the called process; the controlling the session process to execute the called process includes controlling the execution of the called party's subscription service and controlling the called party's routing of the session request message. The called subscription service includes various call session value-added services registered by the called user; the called routing for controlling the session request message is to correctly send the session request message to the called terminal.

Compared with the prior art, the embodiment of the present invention can correctly judge the calling and calling process only by detecting the presence or absence of the called identifier, and the implementation method is simple.

How to control the call session in the session process will be further described below in combination with a simple session process system.

FIG. 4 is a schematic diagram of a simplified structure of a call session system according to an embodiment of the present invention. As shown in the figure, the call session system in this embodiment includes a terminal 1, a call session control function device 1, a terminal 2 and a call session control function device 2, wherein the terminal 1 and the terminal 2 are used to initiate a call session request, and the call session control The function means 1 and the call session control function 2 are used to control the execution of the call session flow.

Taking terminal 1 initiating a call session request to terminal 2 as an example, when terminal 1 initiates a call session request to terminal 2, according to pre-registered information, call session control function device 1 first receives the session request message, and calls session control function device 1 When receiving the session request message, judge whether the called party identification is included in the session request message, if so, control the session process to execute the called process; otherwise, add the called party ID for the session request message, and control the session process to execute the main call process;

In this example, the session request message originates from terminal 1 and does not carry the called party identifier, so the result of judgment by the call session control device 1 is that the called party identifier is not included in the session request message, then the call session control function device 1 will add the called identifier to the session request message, and control the session process to execute the calling process; the control of the session process to execute the calling process includes controlling the execution of the calling subscription service and controlling the calling route of the session request message. In this example, the calling subscription service includes various call session value-added services registered by the calling user; the calling route for controlling the session request message is to correctly send the session request message to the peer call session control Functional device 2.

Under the control of the call session control function device 1, the terminal 1 obtains registered various call session value-added service data, the session control function device 2 receives the session request message, and the call session control function device 2 receives When the message is received, it is also judged whether the called party ID is included in the message, and if so, the control session process executes the called process; otherwise, the called party ID is added to the session request message, and the session process is controlled to execute the calling process ;

In this example, the session request message originates from the call session control device 1 and carries the called party identifier, so the judgment result of the call session control function device 2 is that the session request message includes the called party's identification, then the call session The control function device 2 controls the session flow to execute the called flow; the control of the session flow to execute the called flow includes controlling the execution of the called subscription service and controlling the called routing of the session request message. In this example, the called subscription service includes various call session value-added services registered by the called user; the called route that controls the session request message is to correctly send the session request message to the called terminal 2 .

Under the control of the call session control function device 2, the terminal 2 finally receives the session request message, and obtains various registered call session value-added service data.

The above disclosures are only preferred embodiments of the present invention, which cannot limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims (10)

1. A call session control function device, characterized in that, comprising: a message receiving unit, configured to receive a call session request message; A detection unit, configured to detect whether the session request message received by the message receiving unit includes the called party identifier, and output a corresponding detection result; A first control unit, configured to control the session process to execute the called process when the detection unit detects that the session request message includes the called party identifier; The second control unit is configured to, when the detecting unit detects that the called party ID is not included in the session request message, add the called party ID to the session request message, and control the session process to execute the calling process. 2. The call session control function device according to claim 1, wherein the detection unit comprises a first judging unit and a second judging unit, wherein: A first judging unit, configured to judge whether the session request message received by the message receiving unit includes a message field for carrying a user identifier and output a first judging result or a second judging result, the first judging result indicating the The called party identifier is not included in the session request message, and the second judgment result indicates that the message field is included in the session request message; A second judging unit, configured to receive the second judging result, judging whether the message field includes the called identifier and outputting a third judging result or a fourth judging result, the third judging result indicating the session request message The called party ID is included in the message, and the fourth determination result indicates that the called party ID is not included in the session request message. 3. The call session control function device according to claim 2, wherein the second control unit comprises a first supplementary unit, a second supplementary unit and a caller control unit, wherein: A first supplementary unit, configured to add the message field to the session request message and output a first supplementary result when the first judgment result is received, the first supplementary result is a message field including the message field session request message; A second supplementary unit, configured to add the called party identifier in the message field of the session request message when the first supplementary result and/or the second judgment result is received; The calling control unit is connected with the second supplementary unit and is used to control the conversation flow and execute the calling flow. 4. A method for controlling a call session flow, comprising: Receiving a call session request message, judging whether the session request message includes the called identifier, if including the called identifier, then controlling the session process to execute the called procedure, if not including the called identifier, then the session request message Add the called ID, and control the session process to execute the calling process. 5. The method according to claim 4, wherein determining that the condition for including the called identifier in the session request message comprises: The session request message includes a message field for carrying the user identifier, and the address message in the message field includes the called identifier. 6. The method according to claim 4, wherein determining that the condition for not including the called party identification in the session request message comprises: The session request message does not include a message field for carrying the user identifier, and/or The session request message includes the message field, and the address message of the message field does not include the called identifier. 7. The method according to claim 4 or 6, wherein the step of adding the called party identification for the session request message specifically comprises: When the session request message does not include a message field for carrying a user ID, generating the message field and adding the called party ID in the message field; When the message field is included in the session request message, the called party identifier is added in the message field. 8. The method according to claim 7, wherein the message field for carrying the user identifier is a routing header field. 9. The method according to claim 4, characterized in that, said controlling the session process to execute the calling process comprises controlling the execution of the calling party subscription service and controlling the calling route of the session request message; said controlling the session process execution is controlled by The call flow includes controlling the execution of the called party's subscription service and controlling the called party's routing of the session request message. 10. The method according to claim 4, wherein the call session request message is a session initiation protocol message.

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