CN101166295A - A method, system and device for establishing carrier - Google Patents

Abstract

The invention in use for solving issue that in current technique, CSI service control function entity (SCFE) is unable to interact with CSI for CSI service information so as not to use CS being as load in IMS session. The method includes steps: (1) when receiving session request related to CSI terminal, CSI SCFE determines whether CSI service is needed to use; (2) using expansion information of session message to CSI terminal, CSI SCFE transfers the information for indicating whether this session is needed to use CSI service; (3) based on the indication information to establish CS load correspondingly. The invention realizes that CS is utilized as a load in IMS session.

Description

A method, system and device for establishing bearer

technical field

The present invention relates to the communication field, in particular to a method, system and device for establishing a bearer.

Background technique

IMS is the IP multimedia subsystem in the WCDMA network defined by the 3GPP R5/R6 standard. It is the target network for the 3G mobile network to realize packet voice and packet data and provide unified multimedia services and applications. The IMS uses the IP packet domain as the bearer channel for its control signaling and media transmission, and uses the SIP protocol as the call control signaling. In IMS, IMS user subscription data is centrally managed in HSS, the service is provided by the application server AS, and the session control is completed by the S-CSCF. The two are completely separated in the network structure, and the service is triggered by the S-CSCF to the AS for processing. Multiple ASs can work together. The user accesses the IMS through the proxy node P-CSCF at the current location, and the session and service control are completed by the home domain service node where the user is registered. Therefore, the user can always get the same service at different access points, realizing service management and session control. The separation of the three and the bearer access, as well as the provision of services independent of access and location.

CSI is a research topic in the current 3GPP standard. This topic focuses on how to combine 3G CS domain services with IMS domain services. The research on this topic is divided into two phases, namely CSI phase 1 and CSI phase 2.

The main focus of CSI phase 2 is how the IMS uses the circuit bearer of the CS domain as the bearer of its voice session in its session, that is, the issue of intercommunication between CSI terminals and VoIP terminals.

In the prior art, an architecture model of a network control solution for using a circuit in the CS domain as a real-time media bearer in an IMS session is shown in FIG. 1 .

Under the network control model, the CSI service logic control entity is located in the AS (ASwith CBCF) of the IMS domain. The IMS session request initiated by the CSI terminal is routed to the CBCF. The CBCF determines that a CS bearer needs to be established, and then uses the interworking mechanism between the CS and the IMS to establish a CS call with the CSI terminal through the MGCF/MGW.

According to the different directions in which the CBCF establishes a CS call with the CSI terminal, the network control mode can be specifically divided into a network-to-client direction and a client-to-network direction. The network-to-client direction means that the CS call is established from the CBCF to the CSI terminal. The client-to-network direction means that the establishment of a CS call is that the CBCF instructs the CSI terminal through IMS signaling, and the CSI terminal initiates a CS call to the CBCF after receiving the indication message.

The existing network control mode is an architecture to solve the CSI phase 2 problem. In this architecture, it does not indicate how to transmit information between the CBCF and the CSI terminal. For example, when a CSI terminal is called, how does the CBCF notify the CSI terminal to trigger the use of CSI services (i.e., use the CS as the bearer of IMS real-time media), and when the CSI terminal is called, how does the CSI terminal notify the CBCF that the terminal wants to use the CSI service (That is, using the CS as the bearer of the IMS real-time media).

Further, in this architectural solution, there are still some details that need to be considered and resolved:

1) Optimization of CS bearer establishment: When a CSI terminal roams to a roaming network, how to solve the CS bearer optimization problem between the visiting location and the home location?

2) During the establishment of the CS bearer, how to avoid the adverse impact of the supplementary services of the CS domain on the establishment process?

3) How does CBCF handle session change requests?

Contents of the invention

The present invention provides a method, system and device for establishing a bearer to solve the problem in the prior art that a CSI service control functional entity cannot exchange CSI service information with a CSI terminal, so that CS cannot be used as a bearer in an IMS session.

Further, the CS bearer optimization problem between the visiting location and the home location is solved when the CSI terminal roams.

Further, the problem that the CS bearer establishment process is affected by the CS domain supplementary service is solved.

Further, the problem that the prior art does not provide a processing method for the session change request is solved.

The inventive method comprises:

A. When the CSI service control function entity receives a session request related to the CSI terminal, it judges whether to use the CSI service; B. The CSI service control function entity uses the extended information of the session message between the CSI terminal to transmit whether the session needs Using the indication information of the CSI service; C, correspondingly establishing a CS bearer according to the indication information.

Further, in step A, the information required by the CSI service control function entity to determine whether to use the CSI service includes at least: CSI terminal capability information, session call attribute information, and CS access network capability information. The information required by the CSI control function entity to determine whether to use the CSI service also includes: capability information of the IP access network where the CSI terminal is located.

Still further, the CSI service control function entity uses the following logic to determine whether to use the CSI service according to the information: the attribute information of the session call is IMS real-time media information, and the capability information of the CS access network is the CSI terminal side The CS network supports the dual transmission mode DTM capability information, and the terminal supports the CSI capability, then the CSI service control functional entity determines that the CSI service needs to be used. Or the CSI service control function entity uses the following logic to determine whether to use the CSI service according to the information: the attribute information of the session call is IMS real-time media information, and the capability information of the CS access network is the CS network on the CSI terminal side Support DTM capability information, the terminal supports CSI capability, and the capability information of the IP access network where the CSI terminal is located cannot provide real-time service bearer, then the CSI service control function entity determines that the CSI service needs to be used; or, the session call The attribute information is IMS real-time media information, the capability information of the CS access network is the CS network support DTM capability information on the CSI terminal side, the terminal supports CSI capability, and the capability information of the IP access network where the CSI terminal is located is If the bearer of the real-time service can be provided, the CSI service control function entity determines that the CSI service needs to be used.

To sum up, when the CSI terminal is the calling party, the CSI terminal uses the extended header field or extended message body in the SIP INVITE message between the CSI terminal and the CSI service control function entity to convey the willingness to use the CSI service in this session.

Further, in step B, the CSI service control function entity uses the extended header field or extended message body of the session message to transmit the indication information of whether the current session needs to use the CSI service.

Further, in step C, if the indication information indicates that the CSI service needs to be used, and the CS bearer establishment direction is from the terminal to the network direction, then the CSI terminal initiates a CS bearer from the local CS part to the CSI service control function entity; if The indication information indicates that the CSI service needs to be used, and the CS bearer establishment direction is from the network to the terminal, so the CSI service control functional entity initiates the CS bearer to the CSI terminal.

Further, the step C also includes: if the session request received by the CSI service control function entity points to the CSI terminal, when the CSI service control function entity initiates the establishment of the CS bearer to the CSI terminal, fetch the CS domain of the CSI terminal from the HLR Roaming number, initiate a session request to the roaming number. If the CS bearer establishment direction is the direction from the terminal to the network, the CSI terminal uses the E.164 number that can be routed to the MGCF of the roaming place to initiate a CS call to the CSI service control function entity, so that the call passes through the MGCF of the roaming place and is routed to CSI service control functional entity.

Further, in step C, when the CSI service control function entity or the CSI terminal establishes a CS bearer, it identifies the CS domain service information in the session message, and performs corresponding processing according to the identified CS domain service, so as to avoid the CS domain service information. Negative impact on domain business.

Further, after the session is successfully established in step C, if the CSI service control function entity receives a session change request, it identifies the change type indicated by the session change request, and performs corresponding processing according to the change type.

The system of the present invention includes:

The CSI service control function entity is used to determine whether to use the CSI service when receiving a session request related to the CSI terminal, and use the extended information of the session message with the CSI terminal to transmit the indication of whether the session needs to use the CSI service Information; and cooperate to establish a CS bearer with the CSI terminal; the CSI terminal is used to cooperate with establishing a CS bearer with the CSI control function entity according to the instruction information issued by the CSI service control function entity.

The CSI service control functional entity of the present invention includes the following units:

A judging unit, configured to judge whether a CSI service needs to be used when receiving a session request related to a CSI terminal;

The first transmitting unit transmits the judgment result made by the judging unit to the CSI terminal by using the extended information of the session message with the CSI terminal;

The first CS bearer establishing unit is configured to coordinately establish a CS bearer with the CSI terminal.

Further, the entity further includes: a first CS bearer initiating unit, configured to initiate a CS bearer establishment request to the CSI terminal when the CS bearer direction is the network-to-terminal direction and the judging unit determines that a CSI service needs to be used, And trigger the first CS bearer establishment unit.

The CSI terminal of the present invention includes the following units:

The indication identification unit is used to identify whether the current session needs to use the indication information of the CSI service from the session message sent by the CSI service control functional entity;

The second CS bearer establishing unit is configured to cooperate with establishing a CS bearer with the CSI control function entity after knowing whether to use the CSI service.

Further, the terminal further includes: a second CS bearer initiating unit, configured to initiate a CS bearer to the CSI service control functional entity when the direction of establishing the CS bearer is the direction from the terminal to the network, and the indication identification unit determines that the CSI service needs to be used Establish a request, and trigger the second CS bearer establishing unit.

The beneficial effects of the present invention are as follows:

In the method of the present invention, when the CSI service control function entity receives the session request related to the CSI terminal, it first judges whether the CSI service needs to be used, and uses the extended information of the session message with the CSI terminal to convey whether the session needs to use the CSI service. Instructions for business. Afterwards, if the bearer establishment direction is the direction from the terminal to the network, the CSI terminal initiates the CS bearer to the CSI service control functional entity according to the indication information, and the CSI service control functional entity cooperates to establish the CS bearer; if the bearer establishment direction For the direction from the network to the terminal, the CSI terminal knows from the indication information that it needs to use the CSI service, and waits for the CSI service control function entity to initiate the CS bearer, and the CSI service control function entity initiates the bearer to the CSI terminal according to the indication information, and The CS bearer is established by the cooperation of the CSI terminal.

Thus, it is realized that the CSI service control functional entity exchanges CSI service information with the CSI terminal, and uses the CS as a bearer in the IMS session.

Further, based on the above-mentioned interactive CSI service information and the bearer establishment process, the present invention provides a CS bearer optimization scheme between the visiting location and the home location when the CSI terminal roams for various specific services; respectively provides a CS bearer establishment avoidance scheme A scheme in which the process is affected by supplementary services in the CS domain; a processing method for session change requests is provided.

In order to support the method of the present invention, the present invention also provides a system for establishing a bearer, a CSI service control function entity and a CSI terminal.

Description of drawings

FIG. 1 is a network architecture diagram of using a CS domain circuit as its real-time media bearer in an existing IMS session;

Fig. 2 is a flowchart of the method steps of the present invention;

Fig. 3 is a signaling flowchart of method example one;

Fig. 4 is a signaling flowchart of method example two;

Fig. 5 is a signaling flowchart of method example 3;

Fig. 6 is a signaling flowchart of method example four;

Fig. 7 is a signaling flowchart of method example five;

Fig. 8 is a signaling flowchart of method example six;

Fig. 9 is a schematic structural diagram of the system of the present invention;

FIG. 10 is a schematic structural diagram of a CSI service control function entity in the present invention;

FIG. 11 is a schematic structural diagram of a CSI terminal according to the present invention.

Detailed ways

◆In order to enable the CSI service control function entity and the CSI terminal to exchange CSI service information, so that the CS is used as the bearer in the IMS session, so as to better realize the intercommunication between the CS and the IMS. The present invention provides a method for establishing a bearer, as shown in Figure 2, including the following main steps:

S1. The CSI service control function entity receives a session request related to the CSI terminal.

The session request related to the CSI terminal includes: an IMS session initiation request or session change request directed to the CSI terminal; and an IMS session initiation request or session change request initiated by the CSI terminal.

When the CSI terminal acts as the calling party, the CSI terminal can also use the extended header field or the extended message body in the SIP INVITE message between the CSI terminal and the CSI service control function entity to convey the willingness to use the CSI service in this session.

S2. The CSI service control function entity judges whether to use the CSI service.

● Get the information you need.

The information required by the CSI service control function entity to determine whether to use the CSI service includes at least: the capability information of the CSI terminal, the attribute information of the session call, and the capability information of the CS access network; further, it may also include: Capability information of the IP access network.

The CSI service control function entity obtains the various information in the following manner:

- The CSI service control function entity obtains the capability information of the terminal from the extended information of the registration message of the terminal; and

- The CSI service control function entity queries and obtains the location information of the CSI terminal in the CS domain through the ATI interface, and queries the data configuration according to the location information, so as to obtain the capability information of the CS access network where the CSI terminal is currently located; and

- The CSI service control function entity obtains the access network type of the IMS where the CSI terminal is currently located through the location field information carried in the IMS message, and queries the data configuration accordingly to obtain the IP access network capability information; or, the CSI service control function entity obtains the IP access network capability information through the ATI Interface query to obtain the location information of the CSI terminal in the IMS domain, and query data configuration according to the location information to obtain the capability information of the IP access network where the CSI terminal is currently located; and

- The CSI service control function entity is added to the session path between the peer terminal and the CSI terminal, so as to obtain the attribute information of this session call.

● Determine whether to use the CSI service.

The CSI service control function entity uses the following logic to determine whether to use the CSI service according to the obtained information: the attribute information of the session call is IMS real-time media information, and the capability information of the CS access network is the CS on the CSI terminal side. If the network supports the DTM capability information of the dual transmission mode, and the terminal supports the CSI capability, the CSI service control function entity determines that the CSI service needs to be used.

Further, if the obtained information includes the capability information of the IP access network where the CSI terminal is located, the CSI service control function entity may also use the following logic to determine whether to use the CSI service according to the information: the attribute information of the session call is IMS real-time media information, the capability information of the CS access network is that the CS network on the side of the CSI terminal supports DTM capability information, the terminal supports CSI capability, and the capability information of the IP access network where the CSI terminal is located is unable to provide real-time services The CSI service control function entity determines that the CSI service needs to be used; or, the attribute information of the session call is IMS real-time media information, and the capability information of the CS access network is the DTM capability information of the CS network on the CSI terminal side , the terminal supports the CSI capability, and the capability information of the IP access network where the CSI terminal is located is a bearer capable of providing real-time services, then the CSI service control function entity determines that the CSI service needs to be used.

S3. The CSI service control function entity uses the extended information of the session message with the CSI terminal to transmit the indication information of whether the session needs to use the CSI service.

In the present invention, the CSI service control function entity uses the extended header field or extended message body of the session message to transmit the indication information of whether the current session needs to use the CSI service.

Further in the specific implementation, when the CSI terminal is the calling party, the CSI service control function entity uses the extended header field or the extended message body in the SIP 1xx message between the CSI terminal and the CSI terminal to transmit the indication information of whether the session needs to use the CSI service ;

When the CSI terminal is called, the CSI service control function entity uses the extended header field or extended message body in the SIP INVITE message between the CSI terminal and the CSI terminal to transmit the indication information of whether the session needs to use the CSI service.

S4. Correspondingly establish a CS bearer according to the indication information.

●If the indication information indicates that the CSI service needs to be used, and the CS bearer establishment direction is the client-to-network direction (client-to-network), then the CSI terminal receiving the indication information uses the CS domain number of the CSI service control function entity as the The called number initiates the CS bearer from the local CS part to the CSI service control function entity; then the CSI service control function entity cooperates with the CSI terminal to complete the establishment of the CS bearer.

●If the indication information indicates that the CSI service needs to be used, and the CS bearer establishment direction is network-to-client, then the CSI terminal receiving the indication information knows that it needs to use the CSI service from the indication information After the service, wait for the CSI service control functional entity to initiate a CS bearer; at the same time, the CSI service control functional entity obtains the CS number associated with the IMS of the CSI terminal as the called number, and initiates the CS bearer to the CSI terminal; then the CSI terminal Cooperate with the CSI service control function entity to complete the establishment of the CS bearer.

Further, the manner in which the CSI service control function entity obtains the CS number associated with the IMS number of the CSI terminal includes one of the following:

- The CSI terminal carries the association relationship between the CS number and the IMS number in the extended header field or the extended message body of the registration message, so that the CSI control function entity can obtain this information;

- Using a fixed numbering rule to enable the CSI service control function entity to obtain another number (CS number) of the CSI terminal according to one number (IMS number) of the CSI terminal;

- The CSI service control function entity obtains the CS number of the CSI terminal associated with the IMS number of the CSI terminal from the local configuration data query.

◆Based on the procedures described in S1 to S4, during the CS bearer establishment process, the present invention further provides a CS bearer optimization scheme between the visited location and the home location when the CSI terminal roams, including the following main contents: If the CSI terminal The session request received by the service control function entity points to the CSI terminal, and it can judge whether the CSI terminal has roamed in the CS domain according to the CS domain location information (such as the cell number and location area code) of the CSI terminal in the HSS; if roaming occurs, Then, when the CSI service control function entity initiates the establishment of the CS bearer to the CSI terminal, it first goes to the HLR to obtain the CS domain roaming number of the CSI terminal, and initiates a session request to the roaming number. The direction of CS bearer establishment is the direction from the terminal to the network, then the CSI terminal uses the E.164 number that can be routed to the MGCF of the roaming place to initiate a CS call to the CSI service control function entity, so that the call passes through the MGCF of the roaming place and is routed to CSI service control functional entity. The method for the CSI terminal to obtain the E.164 number includes one of the following: the CSI service control function entity dynamically allocates number information according to the roaming area where the CSI terminal is located, and notifies the CSI terminal; Add related number prefix information to the roaming location information.

◆Based on the procedures described in S1 to S4, in the process of establishing the CS bearer, the present invention further provides a solution for avoiding the impact of CS domain supplementary services on the establishment of the CS bearer, including the following main contents: the CSI service control function entity or When establishing a CS bearer, the CSI terminal identifies the CS domain service information in the session message, and performs corresponding processing according to the identified CS domain service, so as to avoid adverse effects of the CS domain service.

For various specific services, the following provides specific solutions for avoiding the impact of CS domain supplementary services on the CS bearer establishment process.

- If the CS domain service is a number display service, the CSI service control function entity sets the number display restriction on the number information of the CSI service control function entity in the relevant message sent to the CSI terminal; or the CSI terminal After receiving the relevant message sent by the CSI service control function entity, the number information of the CSI service control function entity is subjected to display restriction processing.

- If the CS domain service is the CS domain call hold Call Hold, call waiting Call Wait, call deflection CD, display call transfer ECT, or multi-party session MPTY service, when the CSI terminal receives the service operation request from the user, it will block Operation of the service, and inform the user to initiate the service in the IMS domain.

- If the CS domain service is the operator blocking ODB, call blocking CB service, or called intelligent service Camel service in the CS domain, then if the CS bearer direction is the direction from the terminal to the network, then perform the CSI service control function in the CS domain Entity’s number override authority configuration; further, if the CS bearer establishment direction is the direction from the network to the terminal, the CSI service control function entity goes to the HLR to obtain the roaming number, and the HLR learns that the originator of the roaming number is the CSI service control function entity, and directly sends the CSI service control function entity The service control function entity returns the roaming number of the CSI terminal.

- If the CS domain service is a closed user group (CUG) service in the CS domain, the CS domain number of the CSI terminal and the CS domain number of the CSI service control function entity are configured in the CS domain as a user group.

◆Based on the procedures described in S1 to S4, after the CS bearer is established, the present invention further provides a processing method for the session change request, including the following main contents: If the CSI service control function entity receives the session change request, then identify the session change request The type of change indicated by the change request and is handled accordingly.

For various specific services, the following provides specific solutions for handling session change requests.

- If the change type indicated by the session change request received by the CSI service control function entity is a request from the opposite end to delete real-time media components, the CSI service control function entity removes the CS call to the CSI terminal; or, the CSI service control function entity notifies The CSI terminal (the CSI service control function entity deletes the indication information of the CSI service in the session message sent to the CSI terminal to indicate deletion of real-time media information), and the CSI terminal initiates the teardown of the CS call.

- If the change type indicated by the session change request received by the CSI service control function entity is a request from the opposite end to delete non-real-time media components, the CSI service control function entity initiates an IMS session change request to the CSI terminal to delete the non-real-time media component. Real-time media: If there is no other media component in the IMS session to the CSI terminal, and there is no CS call between the CSI service control functional entity and the CSI terminal, the CSI service control functional entity can tear down the IMS session with the CSI terminal.

- If the change type indicated by the session change request received by the CSI service control function entity is a request from the CSI terminal to delete non-real-time media components, the CSI service control function entity sends the session change request to the opposite end.

- If the change type indicated by the session change request received by the CSI service control function entity is a request from the CSI terminal to delete real-time media components (the CSI terminal deletes the indication information of the CSI service in the session change request, indicating that it wants to delete the real-time media component request), the CSI service control function entity disconnects the CS call with the CSI terminal.

- If the session change request received by the CSI service control function entity indicates that the change type is a request for adding real-time media components from the opposite end, then the CSI service control function entity establishes a CS call with the CSI terminal.

- If the change type indicated by the session change request received by the CSI service control function entity is a request from the peer to add non-real-time media components, then the CSI service control function entity initiates a session change request to the IMS of the CSI terminal to add non-real-time media components media component.

- If the session change request received by the CSI service control function entity indicates that the change type is a request from the CSI terminal to add real-time media components, then the CSI service control function entity establishes a CS call with the CSI terminal.

- If the change type indicated by the session change request received by the CSI service control function entity is a request from the CSI terminal to add non-real-time media components, then the CSI service control function entity initiates an IMS session change request to the peer to add non-real-time media Element.

So far the method part has been outlined, and the method of the present invention will be specifically described below through six examples.

◆Method example 1. When a CSI terminal (CSI UE) is called, the CSI service control function entity (CSI-Control) carries an indication that the CSI service needs to be used in the INVITE extended message. See Figure 3, including the following specific steps:

1. The IMS to which the CSI terminal belongs receives an IMS session request, and the request includes real-time media and non-real-time media information.

2. The CSI service control function entity performs service logic processing according to relevant information, and needs to establish a CS bearer from the CSI terminal to the MGW to carry real-time media information.

3. The CSI service control function entity sends a session request to the CSI terminal. The request message includes non-real-time services and indication information requiring the CSI terminal to initiate a terminal-to-network CS bearer. The indication information can be transmitted by extending the relevant header field of the SIP INVITE message.

4. After receiving the session request message, the CSI terminal initiates a CS call to the CSI service control function entity.

5. The MGCF receives the CS call request from the CSI terminal, maps it into an INVITE and sends it to the CSI service control function entity.

6. The CSI service control function entity sends a 200 OK response message to the MGCF.

7. The MGCF maps the 200 OK response message to the connect message of the CS and sends it to the CSI terminal.

8. The CSI terminal sends a 200 OK response message. The response message only contains the media information of MSRP.

9. The CSI service control function entity merges the CS call from the CSI terminal with the IMS session.

10. The CSI service control function entity sends the combined 200 OK response message to the called side.

◆Method Example 2: When the CSI terminal is calling, the CSI service control function entity carries the indication information of using the CSI service in the 183 message. See Figure 4, including the following specific steps:

1. The CSI terminal initiates an IMS session request, and the request includes real-time media and non-real-time media information. The session request is routed to the logical functional entity of the CSI service control functional entity of the IMS network to which the CSI terminal belongs for control.

2. The logic function entity of the CSI service control function entity forwards the request to the called network.

3. The CSI service control function entity receives the 183 corresponding message from the called side, which carries the real-time media information and non-real-time media information of the called side. The CSI service control function entity performs business logic processing according to the relevant information, and needs to adopt The CS bearer is established in the direction from the terminal to the MGW.

4. The CSI service control function entity forwards the 183 response message to the CSI terminal. The message includes non-real-time services and indication information that requires the CSI terminal to initiate a terminal-to-network CS bearer. The CSI service control function entity can carry this information through the extended header field of the SIP 183 message.

5. After receiving the response message, the CSI terminal initiates a CS call to the CSI service control function entity.

6. The MGCF receives the CS call request from the CSI terminal, maps it into an INVITE and sends it to the CSI service control function entity.

7. The CSI service control function entity sends a 200 OK response message to the MGCF.

8. The MGCF maps the 200 OK response message to the connect message of the CS and sends it to the CSI terminal.

9. The CSI service control function entity receives the 200 OK response message from the called side.

10. The CSI service control function entity merges the CS call from the CSI terminal with the IMS session.

11. The CSI service control function entity forwards the 200 OK response message to the CSI terminal.

◆Method Example 3: When the CSI terminal is roaming, the CSI service control functional entity optimizes the process of CS bearer. See Figure 5, including the following specific steps:

1. The CSI service control function entity receives a request from another terminal to initiate an IMS session, and the request includes real-time media information.

2. The CSI service control functional entity logical functional entity performs logical control. Here, the CSI service control function entity perceives that the CS domain of the CSI terminal roams. The CSI service control function entity may sense the location information carried in the CS domain location update message of the CSI terminal or the location information in the HLR.

3. The CSI service control function entity obtains the roaming number information of the CS domain of the CSI terminal from the HLR.

4. The CSI service control function entity receives the roaming number information of the CS domain of the CSI terminal returned by the HLR.

5. The CSI service control function entity initiates a session request to the BGCF1 in the local domain, and the called number information in the request message is the acquired roaming number information.

6. The BGCF1 in the local domain selects the BGCF2 in the roaming region where the CSI terminal is located as the next hop according to the called number information.

7. The BGCF2 in the roaming domain where the CSI terminal is located selects MGCF2 as the next hop according to the called number information.

8. The MGCF2 sends the call request of the CS domain to the CSI terminal through the routing mechanism of the CS domain.

9. The CSI terminal responds to the CS domain call.

10. MGCF2 sends 200 OK to BGCF2.

11. BGCF2 sends 200 OK to BGCF1.

12. BGCF1 sends 200 OK to the CSI service control function entity.

13. The CSI service control function entity sends 200 OK to the calling side. The CS bearer is successfully established between the CSI terminal and the MGW in the visited domain, and the VoIP bearer is successfully established between the MGW and the calling party.

◆Method Example 4: Incoming CB business circumvention process. See Figure 6, including the following specific steps:

1. The CSI service control function entity receives a request from another terminal to initiate an IMS session, and the request includes real-time media information.

2. The CSI service control functional entity logical functional entity performs logical control. Here, the CSI service control function entity perceives the called side CB service of the CSI terminal.

3. The CSI service control function entity obtains the roaming number information of the CS domain of the CSI terminal from the HLR.

4. The HLR discovers that it is the CSI service control functional entity to obtain the roaming number, bypasses the CB service, and returns the roaming number information of the CS domain of the CSI terminal to the CSI service control functional entity.

5. The CSI service control function entity initiates a session request to the MGCF in the local domain, and the called number information in the request message is the acquired roaming number information.

6. The MGCF sends the call request of the CS domain to the CSI terminal through the routing mechanism of the CS domain.

7. The CSI terminal responds to the CS domain call.

8. The MGCF sends 200 OK to the CSI service control function entity.

9. The CSI service control function entity sends 200 OK to the calling side. The CS bearer is successfully established between the CSI terminal and the MGW in the visited domain, and the VoIP bearer is successfully established between the MGW and the calling party.

◆Method Example 5: The process of the CSI service control function entity processing the session change. This example is specifically the process of processing the IMS terminal adding real-time media. See Figure 7, including the following specific steps:

1. The CSI terminal has established a non-real-time media connection with the calling IMS terminal.

2. The peer IMS terminal initiates a session change request, requesting to add real-time media to the session. An IMS terminal can also request to add non-real-time media to an existing session.

3. The CSI service control functional entity performs service logic judgment.

4. The CSI service control function entity initiates a session request to the MGCF. If the IMS terminal requests to add non-real-time media, the CSI service control function entity will initiate a session change request to the IMS of the CSI terminal at this time.

5. The MGCF sends the call request of the CS domain to the CSI terminal through the routing mechanism of the CS domain.

6. The CSI terminal responds to the CS domain call. If the CSI terminal receives the IMS session change request, the CSI terminal replies with the IMS session request.

7. The MGCF sends 200 OK to the CSI service control functional entity.

8. The CSI service control function entity sends 200 OK to the calling side. The real-time media between the CSI terminal and the calling terminal is added successfully. If the non-real-time media component is added, the non-real-time media component is added successfully.

In addition: the operation of adding media initiated by the CSI terminal can also be completed according to a similar process.

◆Method example 6. The process of the CSI service control function entity processing the session change. This example is specifically the process of processing the deletion of real-time media by the CSI terminal. See Figure 8, including the following specific steps:

1. The CSI terminal has established a multimedia connection with the calling IMS terminal.

2. The CSI terminal initiates a session change request, requesting to delete the real-time media. The CSI terminal can also request to delete non-real-time media.

3. The CSI service control functional entity performs service logic judgment.

4. The CSI service control functional entity initiates a session change request to the peer terminal.

5. The CSI service control function entity receives a response message to the session change request of the peer terminal.

6. The CSI service control functional entity initiates a Bye request to the MGCF. If the CSI terminal initiates a request to delete non-real-time media, the CSI service control function entity directly returns a session modification request to the CSI terminal.

7. The MGCF sends the call teardown request of the CS domain to the CSI terminal through the routing mechanism of the CS domain.

8. The CSI terminal responds to the call teardown in the CS domain.

9. The MGCF sends 200 OK to the CSI service control function entity. The real-time media between the CSI terminal and the calling terminal is successfully deleted. If the non-real-time media component is deleted, the non-real-time media component is deleted successfully.

Note: If it is initiated by the peer IMS terminal to delete real-time media or delete non-real-time media, a similar process can be used to complete.

◆In order to support the above method, the present invention also provides a system for establishing a bearer, as shown in FIG. 9 , which includes: a CSI service control function entity and a CSI terminal connected to each other.

The CSI service control function entity is used to determine whether to use the CSI service when receiving a session request related to the CSI terminal, and use the extended information of the session message with the CSI terminal to convey whether the session needs to use the CSI service Instruction information; and cooperate to establish a CS bearer with the CSI terminal.

The CSI terminal is configured to cooperate in establishing a CS bearer with the CSI control function entity according to the instruction information delivered by the CSI service control function entity.

◆As shown in Figure 10, the CSI service control functional entity (that is, the CSI service control functional entity of the present invention) includes: a judging unit and a first transfer unit connected to each other, and a first CS bearer establishment unit; further includes A first CS bearer initiating unit connected to the judging unit and the first CS bearer establishing unit respectively.

●The judging unit is configured to judge whether to use the CSI service when receiving a session request related to the CSI terminal.

The information required to determine whether to use the CSI service includes at least: the capability information of the CSI terminal, the attribute information of the session call, and the capability information of the CS access network; it may also include: the capability of the IP access network where the CSI terminal is located information.

The judging unit uses the following logic to judge whether to use the CSI service according to the information: the attribute information of the session call is IMS real-time media information, and the capability information of the CS access network is that the CS network on the side of the CSI terminal supports dual The transmission mode DTM capability information, and the terminal supports the CSI capability, then the CSI service control function entity determines that the CSI service needs to be used.

If the information includes the capability information of the IP access network where the CSI terminal is located, the judging unit can also use the following logic to judge whether to use the CSI service according to the information: the attribute information of the session call is IMS real-time media Information, the capability information of the CS access network is that the CS network on the side of the CSI terminal supports DTM capability information, the terminal supports CSI capability, and the capability information of the IP access network where the CSI terminal is located is the bearer that cannot provide real-time services, Then the CSI service control function entity determines that the CSI service needs to be used; or, the attribute information of the session call is IMS real-time media information, and the capability information of the CS access network is the DTM capability information supported by the CS network on the CSI terminal side, and the terminal supports The CSI capability and the capability information of the IP access network where the CSI terminal is located are bearers capable of providing real-time services, and the CSI service control function entity determines that the CSI service needs to be used.

● The first transmitting unit transmits the judgment result made by the judging unit to the CSI terminal by using the extended information of the session message with the CSI terminal (including: the extended header field or the extended message body of the session message).

In a specific implementation, when the CSI terminal is the calling party, the first transfer unit uses the extended header field or the extended message body in the SIP 1xx message between the CSI terminal to transfer the judgment result made by the judgment unit to the CSI terminal; when the CSI terminal is called, the first transfer unit uses the extended header field or extended message body in the SIP INVITE message between the CSI terminal and transfers the judgment result made by the judgment unit to the CSI terminal .

The first CS bearer initiating unit is configured to initiate a CS bearer establishment request to the CSI terminal when the CS bearer direction is the network-to-terminal direction and the judging unit determines that the CSI service needs to be used, and trigger the first CS bearer establishment request A CS bearer establishment unit.

● The first CS bearer establishing unit is configured to cooperate in establishing a CS bearer with the CSI terminal.

◆As shown in Figure 11, the CSI terminal (that is, the CSI terminal of the present invention) includes: an indication identification unit and a second CS bearer establishment unit connected to each other; further includes an indication identification unit and a second CS bearer establishment unit The respectively connected second CS bearer initiating units may further include: a second transfer unit or a third transfer unit, and a fourth transfer unit.

The indication identification unit is configured to identify whether the current session needs to use the indication information of the CSI service from the session message sent by the CSI service control function entity.

The second CS bearer initiating unit is configured to initiate a CS bearer establishment request to the CSI service control functional entity when the CS bearer establishment direction is the direction from the terminal to the network, and the indication identification unit determines that the CSI service needs to be used, and trigger the The second CS bearer establishment unit.

The second CS bearer establishing unit is configured to cooperate with establishing a CS bearer with the CSI control function entity after knowing whether to use the CSI service.

The second transfer unit is configured to use the extended header field or extended message body in the SIP INVITE message with the CSI service control function entity to transfer the willingness to use the CSI service in this session when the CSI terminal is the calling party Information; the third transfer unit is configured to carry CSI capability information in the extended header field or extended message body of the registration message when the CSI terminal registers.

The fourth transfer unit is configured to carry the association relationship between the CS number and the IMS number of the CSI terminal in the extended header field or the extended message body of the registration message when the CSI terminal registers, so that the CSI control function entity can obtain the information.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (40)

1. A method for setting up a bearer, characterized in that, comprising the following steps: A. When the CSI service control function entity receives the session request related to the CSI terminal, it judges whether to use the CSI service; B. The CSI service control function entity uses the extended information of the session message with the CSI terminal to transmit the indication information of whether the session needs to use the CSI service; C. Establishing a CS bearer correspondingly according to the indication information. 2. The method according to claim 1, wherein in step A, the information required by the CSI service control function entity to determine whether to use the CSI service at least includes: CSI terminal capability information, session call attribute information , and the capability information of the CS access network. 3. The method according to claim 2, wherein the information required by the CSI control function entity to determine whether to use the CSI service further includes: capability information of the IP access network where the CSI terminal is located. 4. The method according to claim 2, wherein the CSI service control function entity uses the following logic to determine whether to use the CSI service according to the information: The attribute information of the session call is IMS real-time media information, the capability information of the CS access network is the CS network support dual transmission mode DTM capability information on the CSI terminal side, and the terminal supports CSI capability, then the CSI service control function entity determines Need to use CSI service. 5. The method according to claim 3, wherein the CSI service control function entity uses the following logic to determine whether to use the CSI service according to the information: The attribute information of the session call is IMS real-time media information, the capability information of the CS access network is the CS network support DTM capability information of the CSI terminal side, the terminal supports CSI capability, and the IP access network where the CSI terminal is located The capability information is that the bearer of the real-time service cannot be provided, and the CSI service control function entity determines that the CSI service needs to be used; or, The attribute information of the session call is IMS real-time media information, the capability information of the CS access network is the CS network support DTM capability information of the CSI terminal side, the terminal supports CSI capability, and the IP access network where the CSI terminal is located The capability information is a bearer capable of providing real-time services, and the CSI service control function entity determines that the CSI service needs to be used. 6. The method of claim 3, wherein, The CSI service control function entity obtains the capability information of the terminal from the extended information of the registration message of the terminal; and The CSI service control function entity queries and obtains the location information of the CSI terminal in the CS domain through the ATI interface, and queries the data configuration according to the location information, so as to obtain the capability information of the CS access network where the CSI terminal is currently located; and The CSI service control function entity obtains the access network type of the IMS where the CSI terminal is currently located through the location field information carried in the IMS message, and queries the data configuration accordingly to obtain the IP access network capability information; or, the CSI service control function entity obtains the IP access network capability information through the ATI interface Querying and obtaining the location information of the CSI terminal in the IMS domain, and querying the data configuration according to the location information, so as to obtain the capability information of the IP access network where the CSI terminal is currently located; and The CSI service control function entity is added to the session path between the peer terminal and the CSI terminal to acquire the attribute information of this session call. 7. The method according to any one of claims 2 to 5, wherein when the CSI terminal is used as the calling party, the CSI terminal uses the extended header field or the extended header field in the SIP INVITE message between the CSI service control function entity The message body is used to convey the willingness information of this session to use the CSI service. 8. The method according to claim 1, wherein in step B, the CSI service control function entity uses the extended header field or extended message body of the session message to convey whether the current session needs to use the CSI service Instructions. 9. The method of claim 8, wherein When a CSI terminal is the calling party, after receiving the session request from the CSI terminal, the CSI service control functional entity uses the extended header field or extended message body in the SIP 1xx message between the CSI terminal and the CSI terminal to convey whether the session needs Instructions for using CSI services; When a CSI terminal is called, the CSI service control function entity uses the extended header field or extended message body in the SIP INVITE message between the CSI terminal and the CSI terminal to convey whether the session needs to use Indication information of the CSI service. 10. The method according to claim 1, wherein in step C, if the indication information indicates that the CSI service needs to be used, and the CS bearer establishment direction is from the terminal to the network, the CSI terminal initiates a The CS bearer from the CS part to the CSI service control functional entity; If the indication information indicates that the CSI service needs to be used, and the direction of establishing the CS bearer is from the network to the terminal, the CSI service control function entity initiates the CS bearer to the CSI terminal. 11. The method according to claim 10, wherein if the direction of establishing the CS bearer is from the terminal to the network, the CSI terminal uses the CS domain number of the CSI service control function entity as the called number to initiate the establishment of the CS bearer process; If the direction of establishing the CS bearer is from the terminal to the network, the CSI service control function entity obtains the CS number associated with the IMS of the CSI terminal as the called number to initiate the CS bearer establishment process. 12. The method according to claim 11, wherein the manner in which the CSI service control function entity obtains the CS number associated with the IMS number of the CSI terminal includes one of the following: The CSI terminal carries the association relationship between the CS number and the IMS number in the extended header field or the extended message body of the registration message, so that the CSI control function entity can obtain this information; Using a fixed numbering rule to enable the CSI service control function entity to obtain another number of the CSI terminal according to one number of the CSI terminal; The CSI service control function entity obtains the CS number of the CSI terminal associated with the IMS number of the CSI terminal from the local configuration data query. 13. The method of claim 1, further comprising in the step C: If the session request received by the CSI service control function entity points to the CSI terminal, when the CSI service control function entity initiates the establishment of the CS bearer to the CSI terminal, it goes to the HLR to obtain the CS domain roaming number of the CSI terminal, and initiates a session to the roaming number ask. 14. The method according to claim 1, characterized in that, the step C further comprises: the CSI terminal uses the E.164 number that can be routed to the roaming MGCF to initiate a CS call to the CSI service control function entity, so that The call is routed to the CSI service control function entity through the MGCF in the roaming location. 15. The method according to claim 14, wherein the manner in which the CSI terminal obtains the E.164 number includes one of the following: The CSI service control function entity dynamically allocates number information according to the roaming area where the CSI terminal is located, and notifies the CSI terminal; The CSI terminal perceives the roaming region where it is located, and adds relevant number prefix information according to the roaming region information. 16. The method according to claim 1, wherein in step C, when the CSI service control function entity or the CSI terminal establishes a CS bearer, it identifies the CS domain service information in the session message, and according to the identified The outbound CS domain service is processed accordingly to avoid adverse effects of the CS domain service. 17. The method according to claim 16, wherein if the CS domain service is a number display service, the CSI service control function entity sets the CSI service control function entity in the relevant message sent to the CSI terminal The number display restriction of the number information of the CSI service control function entity; or the CSI terminal performs display restriction processing on the number information of the CSI service control function entity after receiving the relevant message sent by the CSI service control function entity; If the CS domain service is the CS domain call hold Call Hold, call waiting Call Wait, call deflection CD, display call transfer ECT, or multi-party session MPTY service, when the CSI terminal receives the service operation request from the user, it will block the Operation of the service, and inform the user to initiate the service in the IMS domain; If the CS domain service is the operator blocking ODB, call blocking CB service, or called intelligent service Camel service in the CS domain, then if the CS bearer direction is the direction from the terminal to the network, then perform the CSI service control function entity in the CS domain Furthermore, if the CS bearer establishment direction is from the network to the terminal, the CSI service control function entity goes to the HLR to obtain the roaming number, and the HLR learns that the originator of the roaming number is the CSI service control function entity, and directly sends the CSI service control function entity The control function entity returns the roaming number of the CSI terminal; If the CS domain service is a CUG service of the CS domain, the CS domain number of the CSI terminal and the CS domain number of the CSI service control functional entity are configured in the CS domain as a user group. 18. The method according to claim 1, characterized in that, after the session in step C is successfully established, if the CSI service control function entity receives the session change request, then identify the change type indicated by the session change request, and perform the process according to the change type Treat accordingly. 19. The method according to claim 18, wherein, if the change type indicated by the session change request received by the CSI service control function entity is a request for deleting real-time media components from the opposite end, then the CSI service control function entity is removed to The CS call of the CSI terminal; or, the CSI service control function entity notifies the CSI terminal, and the CSI terminal initiates the teardown of the CS call; If the change type indicated by the session change request received by the CSI service control function entity is a request from the opposite end to delete non-real-time media components, the CSI service control function entity initiates an IMS session change request to the CSI terminal to delete the non-real-time media components. media; If the change type indicated by the session change request received by the CSI service control function entity is a request from the CSI terminal to delete non-real-time media components, the CSI service control function entity sends the session change request to the peer; If the change type indicated by the session change request received by the CSI service control function entity is a request from the CSI terminal to delete real-time media components, the CSI service control function entity disconnects the CS call with the CSI terminal; If the change type indicated by the session change request received by the CSI service control function entity is a request from the opposite end to add real-time media components, the CSI service control function entity establishes a CS call with the CSI terminal; If the change type indicated by the session change request received by the CSI service control function entity is a request from the peer to add non-real-time media components, the CSI service control function entity initiates a session change request to the IMS of the CSI terminal to add non-real-time media Element; If the change type indicated by the session change request received by the CSI service control function entity is a request for adding real-time media components from the CSI terminal, the CSI service control function entity establishes a CS call with the CSI terminal; If the change type indicated by the session change request received by the CSI service control function entity is a request from the CSI terminal to add a non-real-time media component, the CSI service control function entity initiates an IMS session change request to the peer to add a non-real-time media component . 20. The method according to claim 18, wherein, if the change type indicated by the session change request received by the CSI service control function entity is a request for deleting real-time media components from the opposite end, then the CSI service control function entity sends The indication information for deleting the CSI service is included in the session message sent to the CSI terminal to indicate that the real-time media information is deleted. 21. The method according to claim 18, wherein, if the change type indicated by the session change request received by the CSI service control function entity is a request from a CSI terminal to delete a real-time media component, then the CSI terminal in the session The indication information for deleting the CSI service in the change request indicates the request to delete the real-time media. 22. A system for establishing a bearer, comprising: The CSI service control functional entity is used to determine whether to use the CSI service when receiving a session request related to the CSI terminal, and use the extended information of the session message with the CSI terminal to transmit the indication of whether the session needs to use the CSI service information; and cooperate to establish a CS bearer with the CSI terminal; The CSI terminal is configured to cooperate in establishing a CS bearer with the CSI control function entity according to the indication information delivered by the CSI service control function entity. 23. The system according to claim 22, wherein the CSI service control function entity comprises the following units: A judging unit, configured to judge whether a CSI service needs to be used when receiving a session request related to a CSI terminal; The first transmitting unit transmits the judgment result made by the judging unit to the CSI terminal by using the extended information of the session message with the CSI terminal; The first CS bearer establishing unit is configured to coordinately establish a CS bearer with the CSI terminal. 24. The system according to claim 23, wherein the CSI service control function entity further comprises: The first CS bearer initiating unit is configured to initiate a CS bearer establishment request to the CSI terminal and trigger the first CS bearer when the CS bearer direction is the network-to-terminal direction and the judging unit determines that a CSI service needs to be used. Create units. 25. The system according to claim 23 or 24, wherein the judging unit judges whether the information needed to use the CSI service includes at least: CSI terminal capability information, session call attribute information, and CS access Network capability information. 26. The system according to claim 25, wherein the information required by the judging unit to judge whether to use the CSI service further includes: capability information of the IP access network where the CSI terminal is located. 27. The system according to claim 25, wherein the judging unit uses the following logic to judge whether to use the CSI service according to the information: the attribute information of the session call is IMS real-time media information, and the CS access The network capability information is that the CS network on the CSI terminal side supports dual transmission mode DTM capability information, and the terminal supports CSI capability, then the CSI service control function entity determines that the CSI service needs to be used. 28. The system according to claim 26, wherein the judging unit uses the following logic to judge whether to use the CSI service according to the information: The attribute information of the session call is IMS real-time media information, the capability information of the CS access network is the CS network support DTM capability information of the CSI terminal side, the terminal supports CSI capability, and the IP access network where the CSI terminal is located The capability information is that the bearer of the real-time service cannot be provided, and the CSI service control function entity determines that the CSI service needs to be used; or, The attribute information of the session call is IMS real-time media information, the capability information of the CS access network is the CS network support DTM capability information of the CSI terminal side, the terminal supports CSI capability, and the IP access network where the CSI terminal is located The capability information is a bearer capable of providing real-time services, and the CSI service control function entity determines that the CSI service needs to be used. 29. The system according to claim 23, wherein the first transmitting unit transmits the judgment result made by the judging unit to the CSI terminal by using the extended header field or the extended message body of the session message. 30. The system according to claim 29, wherein when the CSI terminal is the calling party, the first delivery unit uses the extended header field or the extended message body in the SIP 1xx message between the CSI terminal and the The judgment result made by the judgment unit is transmitted to the CSI terminal; When the CSI terminal is called, the first transmitting unit transmits the judgment result made by the judging unit to the CSI terminal by using the extended header field or the extended message body in the SIP INVITE message between the CSI terminal and the CSI terminal. 31. The system according to claim 22, wherein the CSI terminal comprises the following units: The indication identification unit is used to identify whether the current session needs to use the indication information of the CSI service from the session message sent by the CSI service control functional entity; The second CS bearer establishing unit is configured to cooperate with establishing a CS bearer with the CSI control function entity after knowing whether to use the CSI service. 32. The system according to claim 31, wherein the CSI terminal further comprises: The second CS bearer initiating unit is configured to initiate a CS bearer establishment request to a CSI service control functional entity when the CS bearer establishment direction is the direction from the terminal to the network, and the indication identification unit determines that the CSI service needs to be used, and trigger the first CS bearer establishment request. Two CS bearer establishment units. 33. The system according to claim 31 or 32, wherein the CSI terminal further comprises: The second delivery unit is used to use the extended header field or the extended message body in the SIP INVITE message between the CSI terminal as the calling party to deliver the willingness information to use the CSI service in this session; Or it also includes: a third delivery unit, configured to carry CSI capability information in the extended header field or extended message body of the registration message when the CSI terminal registers. 34. The system according to claim 31 or 32, wherein the CSI terminal further comprises: The fourth transfer unit is configured to carry the association relationship between the CS number and the IMS number of the CSI terminal in the extended header field or the extended message body of the registration message when the CSI terminal registers, so that the CSI control function entity obtains the information. 35. A CSI service control functional entity, comprising the following units: A judging unit, configured to judge whether a CSI service needs to be used when receiving a session request related to a CSI terminal; The first transmitting unit transmits the judgment result made by the judging unit to the CSI terminal by using the extended information of the session message with the CSI terminal; The first CS bearer establishing unit is configured to coordinately establish a CS bearer with the CSI terminal. 36. The entity of claim 35, further comprising: The first CS bearer initiating unit is configured to initiate a CS bearer establishment request to the CSI terminal and trigger the first CS bearer when the CS bearer direction is the network-to-terminal direction and the judging unit determines that a CSI service needs to be used. Create units. 37. A CSI terminal, comprising the following units: The indication identification unit is used to identify whether the current session needs to use the indication information of the CSI service from the session message sent by the CSI service control functional entity; The second CS bearer establishing unit is configured to cooperate with establishing a CS bearer with the CSI control function entity after knowing whether to use the CSI service. 38. The CSI terminal according to claim 37, wherein the terminal further comprises: The second CS bearer initiating unit is configured to initiate a CS bearer establishment request to a CSI service control functional entity when the CS bearer establishment direction is the direction from the terminal to the network, and the indication identification unit determines that the CSI service needs to be used, and trigger the first CS bearer establishment request. Two CS bearer establishment units. 39. The CSI terminal according to claim 37 or 38, wherein the terminal further comprises: The second delivery unit is used to use the extended header field or the extended message body in the SIP INVITE message between the CSI terminal as the calling party to deliver the willingness information to use the CSI service in this session; Or it also includes: a third delivery unit, configured to carry CSI capability information in the extended header field or extended message body of the registration message when the CSI terminal registers. 40. The CSI terminal according to claim 37 or 38, wherein the terminal further comprises: The fourth transfer unit is configured to carry the association relationship between the CS number and the IMS number of the CSI terminal in the extended header field or the extended message body of the registration message when the CSI terminal registers, so that the CSI control function entity obtains the information.

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