CN1333557C - A method for implementing call control - Google Patents

Abstract

The present invention relates to a method for realizing call control, which is used for a call control process based on an ISUP/TUP protocol. The method comprises the following steps: step A: a virtual trunk circuit control entity is additionally arranged on a conversion device, and virtual trunk circuit resources are configured for a special bureau direction related to the call control on the conversion device; step B: when the conversion device in step A makes a call to a signaling processing device of the special bureau direction, the virtual trunk circuit control entity of the conversion device distributes a virtual trunk circuit resource for the ISUP/TUP protocol from the virtual trunk circuit resources configured by the conversion device according to the special bureau direction of the call; step C: the ISUP/TUP protocol of the conversion device sends the call to the signaling processing device of the special bureau direction according to the distributed virtual trunk circuit resource, and the signaling processing device controls the call and completes call succession with the conversion device.

Description

A method for realizing call control

technical field

The present invention relates to the technical field of call control in telecommunication services, in particular to a method based on the integrated services digital network (ISDN) user part (ISUP)/telephone user part (TUP) protocol, which adopts newly added signaling processing equipment in the network to The method by which the call of the switching device is controlled.

Background technique

With the development of telecommunication networks and telecommunication services, the following network technical requirements have gradually emerged: a new signaling processing device is added to the telecommunication network, and the signaling processing device can process signaling messages of the ISUP/TUP protocol, and the The signaling processing device only needs to process various messages and procedures in the call, and does not need the support of the actual trunk circuit for the call.

For example, the network-wide intelligent services that telecom operators are currently trying to solve have the above-mentioned network technical requirements. In order to solve the intelligent business of the whole network, the home location register (HLR) of the fixed network is newly added, and the call control function is completed by using the fixed network HLR as the signaling processing device as mentioned above: service, connect the call to the fixed network HLR, and the fixed network HLR controls the signaling message of the call connection to control the exchange to complete the required business; during the HLR control call connection process, the fixed network HLR does not need to participate in the call, so in fact It is not necessary to establish a trunk circuit between the switch and the fixed network HLR, but because the call control technology based on the ISUP/TUP protocol requires the support of a trunk circuit, otherwise the control using this protocol cannot be implemented. Therefore, In the prior art, a real relay circuit is still required between the signaling processing device and the switching device, which results in the following disadvantages in implementing call control using the prior art:

(1) In the process of call control, trunk circuit resources that are not actually needed are wasted: because not every call service based on ISUP/TUP in the network must be supported by trunk circuits, some of them are based on The call service of ISUP/TUP can achieve the purpose of the service only through the processing and control of signaling messages. However, in the prior art, the ISUP/TUP protocol requires a trunk circuit to complete the call establishment and control process. , resulting in unnecessary waste of relay circuit resources;

(2) Referring to Figure 1, if the existing technology is used to realize the signaling control between the signaling processing device and the switching device, then no matter what kind of business it is solving, the newly added signaling processing device needs to have a corresponding relay Circuit control hardware, that is, the support of the bearer control hardware shown in Figure 1, and the signaling processing equipment also needs to carry out actual relay circuit connection construction with relevant entities in the network, and the two parties must also carry out actual The data configuration of the relay circuit, resulting in many devices in the network and the data configured on the device need to be modified, which is not conducive to the realization of the business;

(3) Referring to Figure 1, in order to realize the call control of the service, the newly added signaling processing equipment supporting the Message Transfer Part (MTP) protocol must support the complete ISUP/TUP protocol and have a complete bearer control function entity, so as to realize the call Control, and the above requirements for the newly added signaling processing equipment make the signaling processing equipment difficult to implement, and the process of realizing related services is more complicated;

(4) Since the processing devices at both ends of the trunk circuit are equal, the bearer control of the processing devices at both ends, the functions performed by the signaling processing protocol, and the protocol flow are basically the same. Therefore, once any side of the trunk circuit When the physical device changes or the configuration data changes, corresponding changes must be made to the peer device, which increases the difficulty of network maintenance and is not conducive to the promotion and improvement of related services.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for realizing call control based on ISUP/TUP protocol. Call control can be realized, and the newly added signaling processing equipment does not need to have hardware modules related to the trunk circuit, and does not need to carry out actual trunk circuit connection construction and data configuration for call control.

To achieve the above object, the present invention provides a method for realizing call control, the method is applied to the call control process based on ISUP/TUP protocol, comprising the following steps:

Step A: Add a virtual trunk circuit control software entity on the switching device, and configure virtual trunk circuit resources for special office directions related to call control on the switching device;

Step B: When the switching device described in step A initiates a call to the signaling processing device of the special office direction, the virtual trunk circuit control software entity of the switching device configures the call from the switching device according to the special office direction of the call. Allocate a virtual trunk circuit resource for the ISUP/TUP protocol in the virtual trunk circuit resource;

Step C: The ISUP/TUP protocol of the switching device sends a call to the signaling processing device of a special office direction according to the allocated virtual trunk circuit resources. The signaling processing device performs call control and completes call connection together with the switching device.

Wherein, the configuration of virtual trunk circuit resources described in step A is:

Different data are configured for the special office direction of each call, and each data respectively represents each trunk circuit that does not actually exist.

Wherein, configuring the virtual trunk circuit resource on the switching device for the special office route related to call control in step A includes:

The configuration of the virtual circuit is performed for the destination signaling point of each special office direction, and the trunk groups of these special office directions are configured to use the virtual circuit.

Wherein, configuring the virtual trunk circuit resource on the switching device for the special office route related to call control in step A includes:

Configure the trunk circuit whose destination address in the office routing table of the switching device is a special office routing address to use a virtual circuit.

Wherein, the virtual trunk circuit control software entity in step B allocates virtual trunk circuit resources according to the special office direction of the call, including:

The virtual trunk circuit control software entity allocates a virtual trunk circuit from the virtual trunk circuit resources configured in step A according to the destination address of the call.

Wherein, the switching device sends a call to the signaling processing device of a special office direction as:

The switching device initiates a call to the signaling processing device of the special office direction through the signaling link.

Wherein, after step C, the method further includes:

The switching device releases the virtual trunk circuit resources applied for in step B.

Visible, the present invention has following beneficial effect:

(1) The present invention does not need actual relay circuit support in the process of realizing call control, therefore, it is not necessary to increase the construction of relay circuit lines, thereby reducing network construction investment;

(2) In addition, because the present invention adopts software to realize the virtual trunk control circuit software entity, therefore, call control can be realized without adding any new physical equipment on the switching equipment, thereby not having an impact on the physical configuration capacity of the switching equipment, Suitable for the promotion of services related to call control;

(3) The virtual circuit resources are simply configured simple data. Compared with the complex maintenance on the physical equipment required by the real relay circuit, the maintenance of the virtual relay circuit in the present invention is simple and feasible, and the simple data The indicated virtual circuit resource has extremely high reliability and is suitable for use in services related to call control;

(4) Because the present invention adopts virtual trunk circuit to realize call control, therefore, signaling processing equipment does not need to realize complete ISUP/TUP agreement, only needs to realize simple control procedure according to specific business requirement, therefore, The requirements for the signaling processing equipment are reduced, so that the signaling processing equipment is easy to realize, and is beneficial to the popularization of services related to call control.

Description of drawings

FIG. 1 is a schematic diagram of a call control model for implementing call control in the prior art.

Fig. 2 is a flow chart of implementing call control in the present invention.

Fig. 3 is a schematic diagram of a networking model including a fixed network HLR set up for solving intelligent services of the entire network.

Fig. 4 is a flow chart of implementing call control by using the method provided by the present invention.

Detailed ways

The present invention is a method for realizing call control. The method is applied to the call control process based on ISUP/TUP protocol. A virtual trunk circuit control software entity is newly added on the switching equipment, and the entities related to each call control are managed in the entity. When the switching device initiates a call to the signaling processing device for call control, the switching device obtains the virtual trunk circuit resource according to the special office direction of the call, and sends The virtual trunk circuit resource is provided to the ISUP/TUP protocol, so that the switching device can send a call to the signaling processing device through the signaling link. After receiving the call, the signaling processing device performs call control and completes it together with the switching device. Continuation of the call.

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

Referring to Fig. 2, the present invention realizes call control based on ISUP/TUP protocol and needs the following steps:

Step A: Establish a virtual trunk circuit control software entity in the switching equipment related to call control, and configure virtual trunk circuit resources of special office directions related to each call control on the switching equipment, wherein, virtual The trunk circuit control software entity manages the virtual trunk circuit resources of the special office directions related to each call control. The trunk circuit resources are different data configured for the special office directions of each call, and each data is respectively Represents each relay circuit that does not actually exist. In the embodiment of the present invention, the following method is used to realize this step:

A virtual trunk circuit control software entity is established on the switching device, and at the same time, on the switching device, the trunk group of the special office direction related to the call is configured to use a virtual circuit; in the embodiment of the present invention, for each special Configure the virtual circuit at the destination signaling point of the office direction, and configure the trunk group of these special office directions to use the virtual circuit; Realize the configuration of the virtual circuit, configure the trunk circuit whose destination address is the special office address in the office routing table to use the virtual circuit, this way does not affect the realization of the present invention;

Step B: The switching device that has configured the virtual circuit as described in step A initiates a call to the special office route related to this call according to the needs of the service to be executed, wherein, in this step, the special office route It is the signaling processing device used to control the call. When the switching device initiates a call to the signaling processing device, the virtual trunk circuit control software entity on the switching device is configured by step A according to the destination address of the call. Allocate a virtual trunk circuit from the virtual trunk circuit resources to provide to ISUP/TUP protocol. After ISUP/TUP obtains the virtual trunk circuit, the switching device initiates a call to the signaling processing device through the signaling link;

Step C: The signaling processing device receives the call sent by the switching device, and controls the call process according to service requirements.

Below in conjunction with a specific entity, a specific application of the call control method based on the ISUP/TUP protocol provided by the present invention is introduced:

Figure 3 shows a network model including a fixed network HLR that telecom operators are setting up to solve services such as network-wide intelligence. The dotted lines in the figure are signaling links. In addition to the situation including two end offices and a fixed network HLR, the networking may also have more complex situations, such as the situation including service switching points (SSP), gateway offices, and long-distance offices; in Figure 3, the introduction of fixed After the network HLR, the fixed network user may have two phone numbers, namely the logical number and the physical number. It is the physical identification corresponding to the user in the end office, which is invisible to the outside world. The fixed network HLR in Figure 3 mainly completes the conversion between the logical number and the physical number in the call, and completes the call together with the switch in the network. continue;

Referring to Fig. 4, with the end office LS1 in Fig. 3 as the calling end office, the end office LS2 as the called end office, the end office in Fig. 3 cooperates with the fixed network HLR to realize the call control process, which specifically includes the following steps:

Step 401: The end office LS1 first sends the call to the fixed network HLR. The end office LS1 is an end office that has established the virtual trunk circuit control software entity as described in step A above. Therefore, the virtual trunk in the end office LS1 The circuit control software entity allocates a virtual trunk circuit resource to the ISUP/TUP protocol according to the destination address of the initiated call, using the configuration of the virtual trunk circuit saved in the end office;

Step 402: After the ISUP/TUP protocol obtains the virtual trunk circuit resource, LS1 utilizes the virtual trunk circuit resource to send an IAM message to the fixed network HLR, and the destination signaling point code (DPC) of the message is the fixed network HLR's Signaling point coding, thereby initiate a call to the fixed network HLR, wherein, in this IAM message, include the physical number of the calling party and the logical number of the called party;

Step 403: After receiving the IAM message, the fixed network HLR performs a calling number query, converts the calling physical number included in the IAM message into a calling logical number, and then returns an ACM message to the calling end office LS1. The ACM message includes the converted logical number of the calling party. After receiving the ACM message, LS1 replaces the physical number of the calling party with the logical number of the calling party;

Step 404: The fixed network HLR performs the called number query, transforms the called logical number carried in the IAM message in step 402 into the called physical number, and then sends a REL message to the end office LS1, which includes a redirection identifier And the transformed called physical number, after the end office LS1 receives the REL message, it transforms the original called logical number into the called physical number, and selects a route out according to the transformed called physical number;

Step 405: the end office LS1 sends an RLC message to the fixed network HLR to release the virtual trunk circuit between the end office LS1 and the fixed network HLR;

Steps 406 to 407: The end office LS1 sends an IAM message to the end office LS2 according to the calling logical number and called physical number transformed according to the above steps, and the IAM message includes the calling logical number and the called physical number; After the office LS2 receives the IAM message, it returns an ACM message to LS1, thereby completing the call connection process;

In the above steps, the fixed network HLR only controls the call, and processes the signaling message to control the call connection process. The fixed network HLR does not participate in the actual voice channel, and there is no need to establish a relay circuit between the fixed network HLR and the end office. Therefore, the call control process can be well realized by using the ISUP/TUP protocol-based call control method provided by the present invention.

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 (7)

1, a method for realizing call control, the method is applied to the call control process based on ISUP/TUP protocol, it is characterized in that, the method comprises the following steps: Step A: Add a virtual trunk circuit control software entity on the switching device, and configure virtual trunk circuit resources for special office directions related to call control on the switching device; Step B: When the switching device described in step A initiates a call to the signaling processing device of the special office direction, the virtual trunk circuit control software entity of the switching device configures the call from the switching device according to the special office direction of the call. Allocate a virtual trunk circuit resource for the ISUP/TUP protocol in the virtual trunk circuit resource; Step C: The ISUP/TUP protocol of the switching device sends a call to the signaling processing device of a special office direction according to the allocated virtual trunk circuit resources. The signaling processing device performs call control and completes call connection together with the switching device. 2. The method according to claim 1, characterized in that the configuration of virtual trunk circuit resources in step A is: Different data are configured for the special office direction of each call, and each data respectively represents each trunk circuit that does not actually exist. 3. The method according to claim 1 or 2, wherein in step A, configuring virtual trunk circuit resources on the switching device for special office routes related to call control includes: The configuration of the virtual circuit is performed for the destination signaling point of each special office direction, and the trunk groups of these special office directions are configured to use the virtual circuit. 4. The method according to claim 1 or 2, characterized in that configuring virtual trunk circuit resources on the switching device for special office routes related to call control in step A includes: Configure the trunk circuit whose destination address in the office routing table of the switching device is a special office routing address to use a virtual circuit. 5. The method according to claim 1, wherein the virtual trunk circuit control software entity in step B allocates virtual trunk circuit resources according to the special office direction of the call, including: The virtual trunk circuit control software entity allocates a virtual trunk circuit from the virtual trunk circuit resources configured in step A according to the destination address of the call. 6. The method according to claim 1, wherein the sending of the call by the switching device to the signaling processing device of the special office direction is as follows: The switching device initiates a call to the signaling processing device of the special office direction through the signaling link. 7. The method according to claim 1, characterized in that, after step C, the method further comprises: The switching device releases the virtual trunk circuit resources applied for in step B.

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