WO2009117916A1

WO2009117916A1 - Method and device for enabling customized alerting tones service

Info

Publication number: WO2009117916A1
Application number: PCT/CN2009/070700
Authority: WO
Inventors: 张颖; 徐培利; 王鹏; 杨莉莉; 张玉侠
Original assignee: 华为技术有限公司
Priority date: 2008-03-26
Filing date: 2009-03-09
Publication date: 2009-10-01
Also published as: CN101547260A; CN101547260B

Abstract

A method and a device for enabling Customized Alerting Tones (CAT) service belonging to the communication technical field is provided by the embodiments of the present invention. The method includes that: During calling, the network node with the control function for Customized Alerting Tones service of the first CAT service side selects a Customized Alerting Tones service from the first CAT service provided by the first CAT service side which is calling and the second CAT service provided by the second CAT service side; the network node provides the selected Customized Alerting Tones service for the caller, and prohibits the caller from being provided with the Customized Alerting Tones service which is not selected. When the call is between the caller and callee, the network node can be positioned at the caller side, and when the call is between the callee and the third party user of call transferring, the network node can be positioned at the callee side. In the case of Customized Alerting Tones service subscribed by multiparty, the present technical solution can avoid the problem that the caller receives multiple alerting tones fixing together, improve the flexibility to enable Customized Alerting Tones services, and improve the user experience about the Customized Alerting Tones service.

Description

Method and device for implementing customized ring back tone service

Technical field

The present invention relates to the field of network communication technologies, and specifically relates to a method for implementing a customized ring back tone service and an apparatus for implementing a customized ring back tone service.

Background technique

Customized Alerting Tones (CAT) services are widely used in systems such as the Public Switched Telephone Network (PSTN) and Global System for Mobile Communiactions (GSM).

In the RFC3959, RFC3960, and RFC5009 standard documents developed by the Internet Engineering Task Force (IETF), two implementation schemes are implemented for implementing early media services using Session Initiation Protocol (SIP): Gateway mode and application server (AppliCATion Server) mode.

When using Gateway mode, the User Agent Server (UAS) implements early media negotiation with the User Agent Client (UAC) through a reliable temporary response mechanism, update (UPDATE) request, and implements early media services. In this mode, early media and normal The Session Description Protocol Request (SDP Offer) is the same for the session; the Application Server pattern carries the Early Session Session Description Protocol (SDP) by extending a new Content Disposition type early session, enabling UAC and UAS uses this type of Content Disposition to implement early media negotiation and implement early media services. In this mode, the SDP of the early media stream and the SDP of the normal session are completely independent.

To enrich the CAT service, the calling party can now subscribe to the CAT service, so that when the calling party dials the called party, the calling party can experience the CAT service subscribed to by the calling party.

In the process of implementing the present invention, the inventor finds that: if multiple parties subscribe to the CAT service, a phenomenon occurs in which the calling party receives a plurality of mixed ring back tones, for example, the calling party and the called party subscribe. For the CAT service, the calling party will receive two ringback tones that are mixed together; for example, if the calling party, the called party, and the third party of the call forwarding subscribe to the CAT service, the calling party will receive Go to three ringback tones that are mixed together. Therefore, the existing CAT service implementation process will result in poor user experience with CAT services.

Summary of the invention

The embodiment of the present invention provides a method and an apparatus for implementing a customized ring back tone service. When a multi-party subscribes to a CAT service, the problem that the calling party receives multiple mixed ring back tones can be avoided, and the customized ring back tone service is improved. The flexibility of implementation increases the user experience with the CAT service.

A method for implementing a customized ring back tone service according to an embodiment of the present invention includes: during a call, a network node having a customized ring back tone service control function on a first CAT service side is provided from a first CAT service side of the call Selecting a customized ring back tone service from the first CAT service and the second CAT service provided by the second CAT service side;

The network node provides the selected customized ring back tone service to the calling user, and prohibits the calling user from providing the customized ring back tone service that is not selected.

The device for implementing the customized ring back tone service provided by the embodiment of the present invention includes: a selecting module, configured to select a custom back with a high priority from at least two customized ring back tone services of the call during a call Ring tone service;

And an execution module, configured to trigger, according to the selection result of the selection module, the operation of allowing the selected user to play the selected customized ring back tone service, and prohibiting the calling user from playing the unselected customized ring back tone service.

According to the description of the foregoing technical solution, in the case that there are multiple customized ring back tone services, the high priority mobile ring back tone service is selected, and the selected ring back tone service is allowed, and the unselected customized ring back tone is prohibited. The voice service can avoid the problem that the calling party receives multiple mixed ring back tones when the multi-party subscribes to the CAT service, improves the flexibility of the customized ring back tone service, and improves the user experience of the CAT service. .

DRAWINGS

1 is a schematic diagram 1 of a process for implementing a customized ring back tone service according to an embodiment of the present invention; FIG. 2 is a schematic diagram 2 of a process for implementing a customized ring back tone service according to an embodiment of the present invention; FIG. 3 is a schematic diagram of implementing a customized ring back tone service according to an embodiment of the present invention; Process diagram three; 4 is a schematic diagram 4 of a process for implementing a customized ring back tone service according to an embodiment of the present invention;

5 is a schematic diagram 5 of a process for implementing a customized ring back tone service according to an embodiment of the present invention;

6 is a schematic diagram 6 of a process for implementing a customized ring back tone service according to an embodiment of the present invention;

7 is a schematic diagram 7 of a process for implementing a customized ring back tone service according to an embodiment of the present invention;

8 is a schematic diagram 8 of a process for implementing a customized ring back tone service according to an embodiment of the present invention;

9 is a schematic diagram IX of a process for implementing a customized ring back tone service according to an embodiment of the present invention;

10 is a schematic flowchart of a process for implementing a customized ring back tone service according to an embodiment of the present invention; FIG. 11 is a schematic flowchart of a process for implementing a customized ring back tone service according to an embodiment of the present invention; FIG. 12 is a customized ring back tone service according to an embodiment of the present invention; FIG. 13 is a schematic diagram of a process for implementing a customized ring back tone service according to an embodiment of the present invention; FIG. 14 is a schematic flowchart of a process for implementing a customized ring back tone service according to an embodiment of the present invention; FIG. Schematic diagram of a customized ring back tone service implementation device;

16 is a schematic flowchart of a process for implementing a customized ring back tone service according to an embodiment of the present invention; FIG. 17 is a schematic flowchart of a process for implementing a customized ring back tone service according to an embodiment of the present invention; FIG. 18 is a customized ring back tone according to an embodiment of the present invention; Schematic diagram of the business realization process.

detailed description

During the call between the calling user and the called user, the network node with the CAT service control function located on the calling side can select a custom back with high priority from at least two customized ring back tone services of the call. After the ring tone service is provided, only the customized ring back tone service selected by the calling user is provided, and the unselected customized ring back tone service is not provided to the calling user, which can effectively prevent the calling user from receiving the mixed mix. The phenomenon of ringback tone. Here, the network node having the CAT service control function, such as a network device having a calling CAT service function control module in the IMS domain, or a network device having a calling CAT service function control module in the CS domain. A network device having a calling CAT service function control module in the IMS domain, such as a custom ring back tone application server (CAT AS). A network device having a calling CAT service function control module in the CS domain, such as a mobile switching center (MSC). At least two custom ring back tone services herein may include: a caller custom ring back tone Any two or three of the service, the called customized ring back tone service, and the call transfer third party customized ring back tone service.

During the call between the called user and the call transfer third party user, the network node with the CAT service control function located on the called side can select a high priority from at least two customized ring back tone services of the call. Customizing the ring back tone service, after which only the selected ring back tone service is selected for the calling user, and the unselected customized ring back tone service is not provided to the calling user, so that the calling user can be prevented from receiving the mixed ring tone service. The phenomenon of multiple ring back tones. Here, the network node having the CAT service control function, such as a network device (such as a CAT AS) having a called CAT service function control module in the IMS domain, or a network device (such as an MSC) having a calling CAT service function control module in the CS domain. ) Wait. The at least two customized ring back tone services herein may include: a called customized ring back tone service and a call transfer third party customized ring back tone service.

The above-mentioned only customized ring back tone service is provided to the calling user, and the unselected customized ring back tone service is not provided to the calling user by the triggering operation performed by the network node. The triggering operations performed by the network node can take many forms. For example, when the priority of the user's customized ringback tone service is high, the peer network node is notified that the customized ringback tone service is not provided, and the network node performs the operation of providing the user's customized ringback tone service. The operation of the user to customize the ring back tone service may be performed by using an existing operation. When the priority of the user's customized ring back tone service is high, the peer network node is notified to provide a customized ring back tone service, and the network node does not perform the provisioning service. The side user customizes the operation of the ring back tone service. For example, when the priority of the user's customized ringback tone service is high, the media resource function module is instructed to discard the media stream of the received user's customized ringback tone service, and the network node performs the provision of the user's customized ringback. Operation of the voice service; when the priority of the user's customized ring back tone service is high, the media resource function module is allowed to normally transmit the media stream of the received user's customized ring back tone service, and the network node does not perform the provisioning of the service. The side user customizes the operation of the ring back tone service. In addition, when the priority of the user's custom ringback tone service is high, the media gateway control function entity is instructed not to perform the media gating operation for opening the customized ringback tone service media stream for the opposite user, and the network node performs the provisioning The user customizes the operation of the ring back tone service; the user customizes the ring back tone service at the opposite side. When the first level is high, the media gateway control function entity is instructed to perform the media gating operation for opening the customized ring back tone service media stream for the opposite user, and the network node does not perform the operation of providing the local user customized ring back tone service, and the like.

FIG. 16 is a flowchart of a method for implementing a customized ring back tone service provided by the present invention.

When the first CAT service side is the network where the call is located, the second CAT service side may be the network where the called party is located or the network where the called party is forwarded; when the first CAT service side is the called party In the network, the second CAT service side may be the network where the user after the call is forwarded. In Figure 16:

Step 1: The first CAT service side receives a session request message, and the session request message may be an INVITE request;

Step 2: The first CAT service side selects the first CAT service or the second CAT service, and the selection method may be one or a combination of the following descriptions:

a. According to the user's customized ring back tone service setting parameter selection.

b. Select according to the local policy set in advance. The local policy here can be a policy set by the operator according to needs.

c. Select according to the historical selection result.

The foregoing selection may be performed after receiving the session request, or may be performed after receiving the response message of the session request fed back by the second CAT service side;

When the first CAT service side selects the first CAT service, the following one method or a combination of multiple methods may be selected to provide the first CAT service to the calling terminal:

Method 1) Sending CAT service indication information to the second CAT service side, where the CAT service indication information is used to notify the second CAT service side that the CAT service is not provided, or is used to notify the second CAT service side of the first CAT service. Providing CAT services on the side, as shown in step 3a;

Method 2) After receiving the CAT service request sent by the second CAT service side, sending a response message rejecting the CAT service request to the second CAT service side, as shown in step 3b;

Method 3) Discard the CAT media stream sent by the second CAT service side, as shown in step 3c. When the first CAT service side selects the first CAT service, the first CAT service side may select the foregoing method according to the received capability information carried in the session request message, for example:

A) When the capability information indicates that the Early Session is not supported, for example, the Supported header field in the session request does not carry the Early Session parameter, and the first CAT service side may select the method 1) or the method 3) ;

B) When the capability information indicates that the Early Session is supported, for example, the Supported header field in the session request carries the Early Session parameter, and the first CAT service side may select the method 2);

C) When the capability information indicates that the Early Session is not supported, the first CAT service side may select the method 2), and the first CAT service side adds the capability information representation in the session request sent to the second CAT service side. Supporting the Early Session, for example: carrying the Early Session parameter in the Supported header field in the session request, the first CAT service side rejects the CAT service request of the second CAT service side by the method 2), and passes the gateway mode to The calling terminal provides the first CAT service.

When the above selected method fails or is not feasible, you can continue to select other methods. When the first CAT service side selects the second CAT service, the following one method or a combination of multiple methods may be selected to provide the second CAT service to the calling terminal:

Method 4) The CAT service indication information is not sent to the second CAT service side, or the CAT service indication information is sent to the second CAT service side, where the CAT service indication information is used to notify the second CAT service side to provide the CAT service, or Notifying that the first CAT service side of the second CAT service side does not provide the CAT service;

Method 5) After receiving the CAT service request sent by the second CAT service side, forwarding the CAT service request to the calling terminal;

Method 6) Forwarding the CAT media stream sent by the second CAT service side to the calling terminal.

When the above selected method fails or is not feasible, you can continue to select other methods. When the first CAT service side uses the method 1), the CAT service indication information may be The second CAT service side may not trigger the second CAT service according to the CAT service indication information, for example, the second CAT service side may be carried by the other CAT service, such as the UPDATE request message or the PRACK request message. The S-CSCF in the CAT service side does not trigger the CAT application server on the second CAT service side according to the CAT service indication information, or the S-CSCF in the second CAT service side triggers the CAT application server on the second CAT service side. The CAT application server on the second CAT service side does not trigger the CAT service according to the CAT service indication information.

Figure 17 depicts the specific implementation flow of the method 2).

Step 1701: The first CAT service side forwards the session request message to the second CAT service side. Step 1702: The second CAT service side sends a session request response message to the first CAT service side, where the second CAT service request is carried. For example, the SDP offer of the Early Session carries the CAT service media information of the second CAT service side;

Step 1703: The first CAT service side feeds back a response message of the request response to the second CAT service side, where the rejection information of the second CAT service is carried, for example, by setting the media line port address in the SDP answer of the Early Session to 0. Reject the second CAT service request.

Figure 18 depicts a specific implementation flow of the method 3).

Step 1801: The first CAT service side changes the IP address and port of the SDP in the received session request message to the IP address and port of the media resource of the first CAT function control module, and then sends the modified session request message to Second CAT service side;

Step 1802: A second CAT media session is established between the second CAT service side and the first CAT service side. For example, the second CAT service side sends an SDP answer to the first CAT service side, where the second CAT service media information is carried. Or the second CAT service side sends the SDP offer of the Early Session to the first CAT service side, where the second CAT service media information is carried, and the first CAT service side sends the SDP answer of the Early Session to the second CAT service side, where the first IP address and port of the media resource of the CAT service;

Step 1803: The second CAT service side sends the second CAT media to the first CAT service side. Flow

Step 1804: The first CAT service side discards the second CAT media stream.

The following briefly describes several implementations of custom ringback tone services.

In the process of the calling user calling the called user, the network node on the calling side selects the high priority customized ring back tone service from the customized ring back tone service of the calling party and the customized ring back tone service of the called party, and The triggering operation is performed, that is, the selected customized ringback tone service information (interpretation) is sent to indicate the operation that the network node that received the information should perform. The selected customized ring back tone service information may be sent in the INVITE message received by the network node on the calling side. Of course, the embodiment of the present invention does not exclude the possibility that the network node on the calling side transmits the information by using other messages. This information can be received directly by the called side network node or by an intermediate node such as the Media Gateway Control Function (MGCF) entity. After receiving the information, the intermediate node, such as the MGCF, may send the information to the network node on the called side, or may not send the information to the network node on the called side, but perform customized round-trip tone service according to the information. The operation of the media stream transmission control, for example, the MGCF does not perform the operation of requesting the media gateway to open the media gating when the priority of the calling user's customized ring back tone service is high according to the information, and the MGCF determines the called party according to the information. When the user customizes the ring back tone service priority, the requesting media gateway is opened to open the media gating operation. When the intermediate node, such as the MGCF, receives the information and sends the information to the called side network node, the MGCF may carry the information after receiving the INVITE message sent by the network node on the calling side. It is sent to the called side network node in the Initial Address Message (IAM). Of course, embodiments of the present invention do not preclude the possibility of transmitting the information using other messages.

It can be seen from the description of the foregoing mode 1 that, when there are multiple customized ring back tone services, by indicating the network node on the called side, or instructing the MGCF, the priority of the caller customized ring back tone service can be high. The media stream of the called ringback tone service is prevented from being played to the calling user, so that the problem that the calling party receives multiple mixed ringback tones can be avoided when the multiparty subscribes to the CAT service. In the first mode, the network node on the calling side and the network node on the called side may be located in the same domain or in different domains. For example, the network node on the calling side is located in the IMS domain, and the network node on the called side is located in the CS domain. For example, the network node on the calling side is located in the CS domain, and the network node on the called side is located in the IMS domain. In addition, the first method is also applicable to the process in which the called user transfers the call to the third-party user. At this time, the network node on the calling side in the first mode is replaced with the network node on the called side, and the called side in the first mode. The network node is replaced by the network node on the call forwarding side.

Manner 2: Regardless of whether the terminal of the calling user supports the application server mode, the application server mode is used to implement the customized ring back tone service.

In the process of the calling user calling the called user, the network node on the calling side selects a high priority custom ring back tone service from the caller customized ring back tone service and the called customized ring back tone service, and performs a trigger operation. . Regardless of whether the terminal of the calling user supports the application server mode, in the case that the calling user customizes the ringback tone service priority, the triggering operation may send the rejection information to the network node on the called side by using the application server mode to indicate The customized ringback tone service of the called user provided by the network node on the called side is rejected. In the case that the called user has a high priority for the ringback tone service, and the terminal of the calling user supports the application server mode, the triggering operation may be: performing a normal message forwarding process by using the application server mode, and not going to the called side. The network node sends the rejection information, and does not provide the calling user with the customized ringback tone service of the calling user. In the case that the called user customizes the ring back tone service priority, and the calling user's terminal does not support the application server mode, the triggering operation may be: converting the message that needs to be forwarded to the calling user into a gateway mode based message. And forwarding, and sending the permission information to the network node on the called side by using the application server mode, to indicate that the called user of the called party is allowed to provide the customized ring back tone service, and the calling user is not provided to the calling user. Customized ring back tone service and more.

In mode 2, the network node on the calling side needs to perform message format conversion because the terminal of the calling user does not support the application server mode, and the network node on the calling side determines that the terminal of the calling user does not support the application. After the server, the network node on the called side is also required to use the application server mode for message interaction, that is, the network node on the calling side notifies the network node on the called side to use the network node. Message interaction in server mode. The notification may be in the following manner: When receiving the gateway mode-based message transmitted by the calling user and forwarding the message to the network node on the called side, the network node on the calling side first converts the message into an application server-based mode. The message is then forwarded. For example, after receiving the INVITE message, the network node on the calling side adds an Early Session parameter in the Supported header field of the INVITE message, and sends an INVITE message with the added parameter to the network node on the called side. Of course, the embodiments of the present invention also do not exclude other ways, such as using other messages to notify the network node on the called side to use the application server mode for message interaction.

It can be seen from the description of the foregoing mode 2 that, in the case that there are multiple customized ring back tone services, whether the terminal of the calling user supports the application server mode or not, the network node of the called side can be customized to ring back at the calling party. When the priority of the audio service is high, the media stream of the customized ringback tone service is prevented from being played to the calling user, so that the calling party can avoid receiving multiple mixed ringbacks when the CAT service is subscribed to by multiple parties. The problem of sound.

In mode 2, the network node on the calling side and the network node on the called side need to be in the same domain, the network node on the calling side can be the calling CAT service function control module, and the network node on the called side can be the called CAT. Business function control module. Embodiments of the invention do not limit the specific representation of network nodes. In addition, the foregoing method 2 is also applicable to the process in which the called user transfers the call to the third-party user. At this time, the network node on the calling side in the second mode is replaced with the network node on the called side, and the called side in the second mode. The network node is replaced by the network node on the call forwarding side.

In the third mode, the network node on the calling side determines the terminal support mode of the calling user, and actively adopts different methods to implement the customized ring back tone service according to the judgment result.

The network node on the calling side determines the mode supported by the terminal of the calling user.

When it is determined that the terminal of the calling user does not support the application server mode, a triggering operation of transmitting the selected customized ringback tone service information is performed to indicate an operation that the network node that receives the information should perform. The message carrying the selected customized ring back tone service information may be sent in the INVITE message received by the network node on the calling side. Of course, the embodiment of the present invention does not exclude the calling side. The network node can send the information by using other messages. Capability. This information may be received directly by the called side network node or by an intermediate node such as a Media Gateway Control Function (MGCF) entity. After receiving the information, the intermediate node, such as the MGCF, may send the information to the network node on the called side, or may not send the information to the network node on the called side, but perform customized round-trip tone service according to the information. The operation of the media stream transmission control, for example, the MGCF does not perform the operation of requesting the media gateway to open the media gating when the priority of the calling user's customized ring back tone service is high according to the information, and the MGCF determines the called party according to the information. When the user customizes the ring back tone service priority, the requesting media gateway is opened to open the media gating operation. In the case that the intermediate node, such as the MGCF, receives the information and sends the information to the called side network node, the MGCF may carry the information in the IAM after receiving the INVITE message sent by the network node on the calling side. Sending to the called side network node, of course, embodiments of the present invention do not preclude the possibility of transmitting the information using other messages.

When it is determined that the terminal of the calling user supports the application server mode, and the calling user customizes the ringback tone service priority, the triggering operation may be performed by using the application server mode to send the rejection information to the network node on the called side. The custom ringback tone service of the called user provided by the network node on the called side is rejected.

When it is determined that the terminal of the calling user supports the application server mode, and the called user customizes the priority of the ring back tone service, the triggering operation performed may be: performing a normal message forwarding process by using the application server mode, and not performing The network node on the called side sends the rejection information, and does not provide the calling user with the customized ring back tone service of the calling user.

It can be seen from the description of the foregoing mode 3 that, in the case that there are multiple customized ring back tone services, the network node on the called side can be indicated in different manners according to the mode supported by the terminal of the calling user, so as to customize the calling party. When the priority of the ring back tone service is high, the media stream of the called ringback tone service is prevented from being played to the calling party, so that the calling party can avoid multiple mixed parties when the CAT service is subscribed to by multiple parties. The problem of ring back tone.

In mode 3, the network node on the calling side and the network node on the called side may be located in the same domain. It can also be located in different domains. For example, the network node on the calling side is located in the IMS domain, and the network node on the called side is located in the CS domain. For example, the network node on the calling side is located in the CS domain, and the network node on the called side is located in the IMS domain. . In addition, the third method is also applicable to the process in which the called user transfers the call to the third party user. At this time, the network node on the calling side in the third mode is replaced with the network node on the called side, and the called side in the third mode. The network node is replaced by the network node on the call forwarding side.

Mode 4: The network node on the called side actively decides to provide a mode for the customized ring back tone service, and the network node on the calling side adopts different methods to implement the customized ring back tone service according to the decision of the network node on the called side.

The network node on the calling side first needs to inform the network node on the called side to provide the address information (first address information) of the customized ring back tone service. The network node on the calling side can negotiate to obtain the first address information by performing information interaction with the calling media resource function module. The first address information may be an IP address and port address information. After the first address information is obtained by negotiation, the network node on the calling side notifies the network node on the called side of the first address information. The notification may be performed by: after receiving the INVITE message, the network node on the calling side carries the first address information in the INVITE message and sends the message to the network node on the called side. The embodiment of the present invention does not preclude the implementation of the first address information by the network node on the called side by using other messages.

In the case that the network node on the called side actively decides to provide the customized ring back tone service in the gateway mode, and the called user customizes the ring back tone service priority, the triggering operation performed by the network node on the calling side is: the calling side The network node interacts with the calling media resource function module to obtain the address information (second address information) of the media stream outputting the customized ring back tone service by the calling media resource function module, and then the second address information Notifying the calling user's terminal, and instructing the calling media resource function module to send the media stream of the customized ring back tone service received from the first address to the calling user through the second address, and the network node on the calling side does not Perform the operation of providing the customized ring back tone service of the calling user.

When the network node on the called side actively decides to use the gateway mode to provide a customized ring back tone service, and the calling user customizes the ring back tone service with a high priority, the triggering operation performed by the network node on the calling side is performed. The action may be: instructing the calling media resource function module to discard the media stream of the customized ring back tone service received from the first address. The triggering operation may also be: The network node on the calling side instructs the calling media resource function module to close the first address.

When the network node on the called side actively decides to provide the customized ring back tone service in the application server mode, and the called user customizes the ring back tone service priority, the triggering operation performed by the network node on the calling side may be: The message transmitted by the network node on the called side is forwarded, and the operation of providing the caller's customized ring back tone service is not performed.

When the network node on the called side actively decides to use the application server mode to provide the customized ring back tone service, and the calling user customizes the ring back tone service priority, the triggering operation performed by the network node on the calling side may be: The network node on the calling side sends a message rejecting the customized ring back tone service media stream to the network node on the called side, to indicate that the network node on the called side does not send the media stream of the customized ring back tone service of the called user, and the calling party The network node on the side performs an operation of providing a customized ringback tone service for the calling user.

It can be seen from the description of the foregoing mode 4 that, in the case that there are multiple customized ring back tone services, the calling side network node may use different modes to indicate the calling media resource function module or according to the mode adopted by the called side network node. The called side network node avoids the media stream of the called ringback tone service being played to the calling party when the priority of the caller's customized ring back tone service is high, so that the multiparty can subscribe to the CAT service and avoid The calling party receives a plurality of mixed ring back tones.

In mode four, the network node on the calling side and the network node on the called side need to be in the same domain. In addition, the fourth method is also applicable to the process in which the called user transfers the call to the third-party user. At this time, the network node on the calling side in the fourth mode is replaced with the network node on the called side, and the calling media resource in the fourth mode. The function module is replaced with the called media resource function module, and the network node on the called side in the fourth mode is replaced with the network node on the call forwarding side.

In the fifth method, the network node on the calling side determines the terminal support mode of the calling user, and implements a customized ring back tone service by using the calling media resource function module according to the judgment result. The network node on the calling side determines the mode supported by the terminal of the calling user.

In the case that it is determined that the terminal of the calling user does not support the application server mode, the network node on the calling side needs to inform the network node on the called side to provide the address information (ie, the first address information) of the customized ring back tone service. The network node on the calling side can negotiate to obtain the first address information by performing information interaction with the calling media resource function module. The first address information may be an IP address and port address information. After the first address information is obtained, the network node on the calling side notifies the network node on the called side of the first address information. The notification may be performed by: after receiving the INVITE message, the network node on the calling side carries the first address information in the INVITE message and sends the message to the network node on the called side. The embodiment of the present invention does not exclude the use of other messages to inform the network node on the called side of the implementation of the first address information. In the case that the called user has a high priority of the ringback tone service, the triggering operation performed by the network node on the calling side is: the network node on the calling side interacts with the calling media resource function module to obtain the calling party through negotiation. The media resource function module outputs address information (ie, second address information) of the media stream of the customized ring back tone service, and then, the second address information is notified to the terminal of the calling user, and indicates that the calling media resource function module will be The media stream of the customized ring back tone service received at an address is sent to the calling user through the second address, and the network node on the calling side does not perform the operation of providing the calling user to customize the ring back tone service. The triggering operation performed by the network node on the calling side may be: instructing the calling media resource function module to discard the customized ring back tone service received from the first address, in the case that the calling user has a high priority of the ringback tone service. Media stream. The triggering operation may also be: The network node on the calling side instructs the calling media resource function module to close the first address.

When it is determined that the terminal of the calling user supports the application server mode, and the called user customizes the priority of the ring back tone service, the triggering operation performed by the network node on the calling side may be: directly forwarding the network node on the called side The transmitted message does not perform the operation of providing the calling user with a customized ring back tone service.

When it is determined that the terminal of the called user supports the application server mode, and the calling user customizes the ringback tone service priority, the triggering operation performed by the network node on the calling side may be: sending to the network node on the called side Refusing to customize the information of the ringback tone service media stream to indicate the network on the called side The node does not send the media stream of the customized ring back tone service of the called user, and performs an operation of providing the calling user to customize the ring back tone service.

It can be seen from the description of the foregoing manner 5 that, in the case that there are multiple customized ring back tone services, the calling side network node may use different modes to indicate the calling media resource function module or according to the mode supported by the calling user's terminal. The called side network node avoids the media stream of the called ringback tone service being played to the calling party when the priority of the caller's customized ring back tone service is high, so that the multiparty can subscribe to the CAT service and avoid The calling party receives a plurality of mixed ring back tones.

In mode 5, the network node on the calling side and the network node on the called side need to be in the same domain. In addition, mode 5 is also applicable to the process in which the called user transfers the call to the third-party user. At this time, the network node on the calling side in mode 5 is replaced with the network node on the called side, and the calling media resource in mode five. The function module is replaced by the called media resource function module, and the network node on the called side in the fifth mode is replaced with the network node on the call forwarding side.

In the foregoing various manners, the process of selecting a high-priority customized ring back tone service from a plurality of customized ring back tone services is used. The embodiment of the present invention may adopt multiple policies to select a high priority custom ringback. Sound business. For example, the network node on the calling side can select a high priority custom ring back tone service according to any of the following eight policies:

1. Select a high priority custom ring back tone service according to the user customized ring back tone service setting parameter. 2. Select a high priority custom ring back tone service according to a preset local policy. The local policy here can be a policy set by the operator as needed.

3. Select a high-priority custom ringback tone service based on the recorded custom ringback tone service selection result.

4. In the case of call forwarding, select the customized ring back tone service of the called user or the call transfer third party user.

5. In the case where the called user is concealed, select the customized ring back tone service of the calling user. 6. In the case that the call transfer third party user is hidden, select the customized ring back tone service of the calling user or the called user.

7. Select a high-priority custom ringback tone service based on the media format requested by both users of the call. The media format requested by the user can be obtained from the SDP information of the INVITE request, the SDP information of the Early session for the response information of the INVITE request, and the like. For example, when the SDP information requested by the INVITE describes the audio media stream, and the SDP information of the Early Session describes the video media stream, the calling user CAT service can be selected.

8. Select a customized ring back tone service that matches the media format according to the media format supported by the calling user's terminal and the media format of multiple customized ring back tone services. For example, when the calling user's terminal only supports the audio format and the called user's terminal supports the video format, the calling user CAT service is selected.

Embodiments of the present invention do not limit the specific implementation form of a policy for selecting a high priority custom ring back tone service.

The following describes a method for implementing a customized ring back tone service according to an embodiment of the present invention by taking a call between a calling user and a called user as an example.

In the IMS domain, the flow of the method for implementing the customized ring back tone service provided by the mode 1 is as shown in FIG. 1 of FIG. 1. Step 1. The calling CAT service function control module receives the INVITE request.

Step 2: The calling CAT service function control module performs a high-priority CAT service selection process, that is, determines whether the calling user CAT service has a high priority or the called user CAT service has a high priority. For example, select a high priority CAT service based on any of the following a to c strategies:

a. According to the calling user's CAT service setting parameters, determine whether the calling user's CAT service priority is high or the called user's CAT service has a high priority.

b. Determine whether the calling user's CAT service has a high priority or the called user's CAT service has a high priority according to a preset local policy.

c. According to the previous selection result (for example, the previous selection result), it is determined whether the calling user CAT service priority is high or the called user CAT service priority is high. Step 3: The calling CAT service function control module carries a CAT service priority indication in the INVITE request according to the selected CAT service priority, and the method for carrying the CAT service priority indication includes any one or any combination of the following:

a. Carrying a CAT service priority indication in the header field of the INVITE request, for example, when the calling user CAT service has a high priority, carrying a CAT parameter (such as a calling user CAT service information) in the Reject-Contact header field, or expanding A new header field, Rject-Service, and carrying CAT parameters (such as calling CAT service information) in the extended header field Reject-Service; for example, when the called CAT service has a high priority, in Accept-Contact The CAT parameter (such as the called user CAT service information) is carried in the header field, or a new header field Accept-Service is extended, and the CAT parameter (such as the called user CAT service information) is carried in the extended header field Accept-Service. .

b. Carrying the CAT service priority indication (that is, the information of the selected customized ring back tone service) in the message body of the INVITE request, for example, when the priority of the calling user CAT service is high, the Content-Disposition is carried in the INVITE request. The SDP information of the Early Session, and the port address of all media lines in the SDP information is 0, indicating that the calling CAT service has a high priority and rejects the called CAT service.

Step 4: The called CAT service function control module performs corresponding processing according to the CAT service priority indication carried in the INVITE request, and the processing may be as follows:

a. When the CAT service priority indication indicates that the calling user CAT service has a high priority, the called CAT service function control module only performs the routing function, that is, forwards the received INVITE request, and does not perform the operation of providing the called user CAT service. The operation of not providing the called user CAT service may include: not requesting the media resource for the called user CAT service.

b. When the CAT service priority indication indicates that the calling user CAT service priority is low, that is, the called user CAT service priority is high, the called CAT service function module performs an operation of providing the called user CAT service, and performs providing the called user CAT. The operations of the service may include: requesting a media resource for the called user CAT service. Optionally, in step 5, when the CAT service priority indication indicates that the calling user CAT service has a high priority, and the called user triggers the call forwarding service (ie, call forwarding), the CAT service priority indication may be A terminal that carries a third-party user that is sent to the call forwarding in the INVITE request.

In the case where the IMS domain is interworking with the CS domain, and the calling user is in the IMS domain and the called user is in the CS domain, the method for implementing the customized ringback tone service provided by the mode 1 is as shown in FIG. 2 .

In Figure 2, step 1. The calling CAT service function control module receives the INVITE request.

c, based on past selection results (for example, the previous selection result, which means the calling user

The CAT service function control module needs to record the selection result after selecting the high priority CAT service.) Determine whether the calling user CAT service has a high priority or the called user CAT service has a high priority.

Step 3: The calling CAT service function control module carries a CAT service priority indication in the INVITE request according to the selected CAT service priority, and the method for carrying the CAT service priority indication includes any one or any combination of the following:

a. Carrying a CAT service priority indication in the header field of the INVITE request, for example, when the calling user CAT service has a high priority, carrying a CAT parameter (such as a calling user CAT service information) in the Reject-Contact header field, or expanding A new header field, Rject-Service, and carrying CAT parameters (such as calling party CAT service information) in the extended header field Reject-Service; for example, when the called user CAT service has a high priority, in Accept -Contact header field carries CAT parameters (such as called user CAT service information), or expands a new header field Accept- Service, and carry the CAT parameter (such as the called user) in the extended header field Accept-Service

CAT business information).

The calling CAT service function control module sends an INVITE request carrying the CAT service priority indication to the MGCF. The MGCF obtains and determines the CAT service priority indication in the INVITE request. When it is determined that the CAT service priority indication indicates that the calling user CAT service priority is high, the MGCF may go to step 4al or to step 4a2; the MGCF determines When the CAT service priority indication indicates that the called user CAT service has a high priority, go to step 4b.

Step 4al: The MGCF carries the CAT service priority indication in the IAM, and sends the IAM to the CS network. The embodiment of the present invention may enable the IAM to carry the CAT service priority indication by adding a new field in the IAM, or using the original field in the IAM, for example: Expand Optional Forward Call IndiCATors in the IAM (optional forward call indication) The usage of the G-D bit of the field, when the G bit is set to "1", indicates that the calling user's CAT service has a high priority, and when it is "0", the called user's CAT service has a higher priority. Therefore, the CS network can judge that the calling user CAT service has a high priority according to the indication information in the IAM, and does not perform an operation of providing the called user CAT service. In addition, the calling CAT service function control module normally performs the operation of providing the calling user CAT service.

Step 4a2: The MGCF sends a normal IAM to the CS network, but does not require the MGW to open the media gating. For example, the MGCF does not send an H.248 command to the MGW requesting the MGW to open the media gating. Thus, although the CS network can perform the operation of providing the called user CAT service according to the IAM normally, since the MGW does not open the media gating, the called user CAT service media stream is not transmitted to the calling user. In addition, the calling CAT business function control module is normally implemented. The operation for the calling user CAT service.

Step 4b: The MGCF sends a normal IAM to the CS network. Thereafter, the calling CAT service function control module can act as a routing function, forward the received request or response, and do not perform the operation of providing the calling user's CAT service, for example, not requesting the media resource for the calling user CAT service.

The CS network in Figure 2 above may be a PSTN network or a PLMN network. The CS network involved in the following embodiments may also be a PSTN network or a PLMN network.

In the case where the IMS domain communicates with the CS domain, and the calling user is in the CS domain and the called user is in the IMS domain, the method for implementing the customized ringback tone service provided by the mode 1 is as shown in FIG. 3.

In Figure 3, step 1. After the CS network implements the selection of high-priority CAT services,

The MGCF in the IMS network sends an IAM carrying a CAT service priority indication. The method of carrying the CAT service priority indication in the IAM is as described in Figure 4, step 4al above. The MGCF receives the IAM transmitted by the CS network, and proceeds to step 2a or to step 2b.

Step 2a: The MGCF obtains the CAT service priority indication in the IAM, and carries the CAT service priority indication in the INVITE request, and sends the INVITE request. Therefore, the calling CAT service function control module can determine whether to perform the operation of providing the calling user CAT service according to the received indication information, for example, when it is determined that the called CAT service has a high priority, the calling CAT service is not performed. Operation, does not apply for media resources for the calling user CAT service.

The method of carrying the CAT service priority indication in the INVITE request may be any one of the following:

CAT business information).

Step 2b: The MGCF sends a normal INVITE request, and when the CAT service priority indication indicates that the calling user CAT service has a high priority, the MGW may not be required to open the media gating. For example, the MGCF does not send the MGW to request the MGW to open the media door. Controlled H.248 command. In the case that the MGW does not open the media gating, the called user CAT service media stream can be prevented from being transmitted to the calling user's terminal. Thereafter, the calling CAT service function control module normally performs the operation of providing the calling user CAT service according to the received INVITE request.

The flow of the method for implementing the customized ring back tone service provided by the second method is as shown in FIG. 4 .

In Figure 4, step 1. The calling CAT service function control module receives the INVITE request, and proceeds to step 2.

Step 2: The calling CAT service function control module determines the terminal capability of the calling user. The method for judging the terminal capability of the calling user may be any of the following:

a. The calling CAT service function control module determines that the calling terminal's terminal supports P-Early- when it determines that the header field P-Early-Media carried in the received INVITE request is supported.

Media (that is, support gateway mode).

The calling CAT service function control module determines that the terminal of the calling user supports the Early Session when it determines that the header field Supported in the INVITE request is carried with the Early Session parameter.

The calling CAT service function control module determines that the calling user's terminal does not support Early

Session mode, then to step 3a. The calling CAT service function control module determines that the terminal of the calling user supports the Early Session mode, and then proceeds to step 3b.

Step 3a: In the case that the calling user's terminal does not support the Early Session, the calling CAT service function control module adds the Early Session parameter to the header field Supported of the INVITE request, and then forwards the INVITE request to step 4.

Step 3b: When the calling user's terminal supports the Early Session, the calling CAT service function control module directly forwards the INVITE request to step 4.

Step 4: The called CAT service function control module receives the INVITE request, and forwards the INVITE request to the called party (ie, the called user terminal), to step 5.

Step 5. The called party receives the INVITE request and returns a temporary response (Provisional

Response) , to step 6.

Step 6. The called CAT service function control module receives the temporary response, and then provides the called CAT service in an application server mode, and carries the SDP of the called user CAT service with the Content-Disposition as the Early Session in the message body of the temporary response. (offer).

Step 7. After receiving the temporary response, the calling CAT service function control module selects the high priority CAT service. For example, the calling CAT service function control module can select a high priority CAT service according to any of the following a to g policies:

c. According to the previous selection result (for example, the previous selection result, this means that the calling CAT service function control module needs to record the selection result after selecting the high priority CAT service) to determine whether the calling user CAT service has a high priority or The called user CAT service has a high priority.

d. According to the status code of the temporary response, determine whether the calling user CAT service priority is high or the called user CAT service priority is high, for example, when the temporary response status code is 181 (indicating that there is a call) Calling transfer), it can be determined that the called user CAT service has a high priority.

e. According to the information carried in the header field of the temporary response, it is determined whether the calling user CAT service has a high priority or the called user CAT service has a high priority. For example, when the privacy in the temporary response is set to "ID", it can be determined that the calling user CAT service has a high priority.

f. The calling CAT service function control module determines whether the calling user CAT service priority or the called user CAT service priority is determined according to the SDP information in the received INVITE request and the SDP information of the Early session carried in the received temporary response. Level is high. For example, when the SDP information requested by the INVITE describes the audio media stream, and the SDP information of the Early Session of the temporary response describes the video media stream, it can be determined that the calling user CAT service has a high priority.

g. The calling CAT service function control module determines whether the calling user CAT service has a high priority according to the calling user's terminal capability (representing the media format supported by the calling user's terminal) and the SDP information of the Early session carried in the temporary response. The called user CAT service has a high priority. For example, when the calling user's terminal only supports audio, and the Early Session's SDP information describes the video media stream, it can be determined that the calling user's CAT service has a high priority.

In the case that the calling CAT service function control module determines that the calling user's CAT service has a high priority, whether the calling user's terminal supports the Early Session or the Ρ-Early-Media, the process proceeds to step 8a.

When the calling CAT service function control module determines that the called user CAT service has a high priority and the calling user's terminal supports the Early Session, the process proceeds to step 8b.

In the case where the calling CAT service function control module determines that the called user CAT service has a high priority and the calling user's terminal only supports P-Early-Media, the process proceeds to step 8c.

Step 8a: The calling CAT service function control module sets the Content-Disposition in the PRACK request to the SDP (Answer) information of the Early Session, and sets the port address of all media lines in the SDP information to 0, and then The CAT service function control module sends the PRACK request. After receiving the PRACK request, the called CAT service function control module does not perform the operation of providing the called user CAT service. Calling CAT business function control module The block normally performs the subsequent operation of providing the calling user CAT service.

Step 8b: The calling CAT service function control module directly forwards the temporary response. Moreover, the calling CAT service function control module no longer performs the subsequent operation of providing the calling user CAT service.

Step 8c: In the case that the temporary response carries the SDP information of the called party CAT service whose Content-Disposition is Early Session and the SDP information of the normal session returned by the called party of the session, the calling CAT service The function control module stores the SDP information of the normal session returned by the called party of the session in the Content-Disposition, deletes the content of the content in the temporary response message body, and sets the Content of the SDP information of the called party CAT service of the Early Session. Change Disposition to session, and add the header field in the temporary response P-Early-Mediao header field P-Early-Media parameters can be set to "sendrecv". Then, the to tag of the temporary response is changed to the to tag generated locally by the CAT service function control module, and then the temporary response is forwarded to the calling party (ie, the terminal of the calling user). In the case that only the SDP information of the called party CAT service whose Content-Disposition is the Early Session is carried in the temporary response, the calling CAT service function control module directly sets the Content of the SDP information of the called party CAT service set to the Early Session. Disposition is changed to session, and the header field P-Early-Media is added to the temporary response. The parameter of the header field P-Early-Media can be set to "sendrecv". Then, the to tag of the temporary response is changed to the to tag generated locally by the CAT service function control module, and then the temporary response is forwarded to the calling party. Moreover, the calling CAT service function control module no longer performs the subsequent operation of providing the calling user CAT service. Go to step 9c.

Step 9c: The calling CAT service function control module sends a PRACK request to the called party, where

The PRACK request carries the SDP information of the normal session, and the SDP information of the normal session is carried in the PRACK request in the manner that the Content-Disposition is the Early Session.

It should be noted that the execution order of steps 8c and 9c may be reversed or may be performed simultaneously. In addition, the normal session in this embodiment refers to a session of a non-customized ring back tone service.

The flow of implementing the customized ring back tone service provided by mode 3 is as shown in FIG. 5.

In Figure 5, step 1, the calling CAT service function control module receives the INVITE request, to 歩 Step 2.

Step 2: The calling CAT service function control module determines the terminal capability of the calling user. The method for judging the terminal capability of the calling user may be as described in step 2 in FIG. 4 above, and the description is not repeated here. When the calling CAT service function control module determines that the calling user's terminal only supports P-Early-Media, it proceeds to step 3a, or to step 3a2, or to step 3a3. When the calling CAT service function control module determines that the calling user's terminal supports the Early Session, it proceeds to step 3b.

Step 3a: The calling CAT service function control module performs a high priority CAT service selection process, that is, determines whether the calling user CAT service has a high priority or the called user CAT service has a high priority. The specific selection process may be as described in the above step 2 of FIG. 1, and the description will not be repeated here. Go to step 4a.

Step 4a: The calling CAT service function control module carries a CAT service priority indication in the INVITE request according to the selected CAT service priority, and the method for carrying the CAT service priority indication is as described in step 3 of FIG. The description will not be repeated here. Go to step 5a.

Step 5a: The called CAT service function control module performs corresponding processing according to the CAT service priority indication carried in the INVITE request, and the two methods of the processing may be as described in step 4 of FIG. 1 above, and are not repeated here. Description.

Step 3a2: The calling CAT service function control module performs a high-priority CAT service selection process, that is, determines whether the calling user CAT service has a high priority or the called user CAT service has a high priority. The specific selection process may be as described in the above step 2 of FIG. 2, and the description will not be repeated here. Go to step 4a2.

Step 4a2, the calling CAT service function control module carries the CAT service priority indication in the INVITE request according to the selected CAT service priority, and the method for carrying the CAT service priority indication is as described in step 3 of FIG. 2 above. Repeat the explanation.

The calling CAT service function control module sends an INVITE request carrying the CAT service priority indication to the MGCF. MGCF obtains and judges CAT service priority in INVITE request The indication, when determining that the CAT service priority indication indicates that the calling user CAT service priority is high, may go to step 5al or to step 5a2; the MGCF determines that the CAT service priority indication indicates that the called user CAT service takes precedence. When the level is high, go to step 5a3.

Step 5al: The MGCF carries the CAT service priority indication in the IAM, and sends the IAM to the CS network. The embodiment of the present invention may enable the IAM to carry the CAT service priority indication by adding a new field in the IAM, or using the original field in the IAM, for example: Expand Optional Forward Call IndiCATors in the IAM (optional forward call indication) The usage of the G-D bit of the field, when the G bit is set to "1", indicates that the calling user's CAT service has a high priority, and when it is "0", the called user's CAT service has a higher priority. Therefore, the CS network can judge that the calling user CAT service has a high priority according to the indication information in the IAM, and does not perform an operation of providing the called user CAT service. In addition, the calling CAT service function control module normally performs the operation of providing the calling user CAT service.

Step 5a2: The MGCF sends a normal IAM to the CS network, but does not require the MGW to open the media gating. For example, the MGCF does not send an H.248 command to the MGW requesting the MGW to open the media gating. Thus, although the CS network can perform the operation of providing the called user's CAT service according to the normal operation of the IAM, since the MGW does not open the media gating, the called user CAT service media stream is not transmitted to the calling user. In addition, the calling CAT service function control module normally performs the operation of providing the calling user CAT service.

Step 5a3: The MGCF sends a normal IAM to the CS network. Thereafter, the calling CAT service function control module can act as a routing function, forward the received request or response, and not perform the operation of providing the calling user's CAT service, for example, not requesting the media resource for the calling user CAT service.

Step 3a3: After the calling CAT service function control module implements the selection of the high priority CAT service, the IAM that carries the CAT service priority indication is sent to the MGCF in the IMS network. The method of carrying the CAT service priority indication in the IAM is as described in step 4a of FIG. 2 above. The MGCF receives the IAM transmitted by the CS network, and proceeds to step 4a3 or to step 4a4. Step 4a3: The MGCF obtains the CAT service priority indication in the IAM, and carries the CAT service priority indication in the INVITE request, and sends the INVITE request. Therefore, the calling CAT service function control module can determine whether to perform the operation of providing the calling user CAT service according to the received indication information, for example, when it is determined that the called CAT service has a high priority, the calling CAT service is not performed. Operation, does not apply for media resources for the calling user CAT service.

The method for carrying the CAT service priority indication in the INVITE request may be as described in the foregoing step 2a in FIG. 3, and the description is not repeated here.

Step 4a4: The MGCF sends a normal INVITE request, and when the CAT service priority indication indicates that the calling user CAT service has a high priority, the MGW may not be required to open the media gating. For example, the MGCF does not send the MGW to request the MGW to open the media door. Controlled H.248 command. In the case that the MGW does not open the media gating, the called user CAT service media stream can be prevented from being transmitted to the calling user's terminal. Thereafter, the calling CAT service function control module normally performs the operation of providing the calling user CAT service according to the received INVITE request.

Step 3b: The calling CAT service function control module directly forwards the received INVITE request. Go to step 4b.

Step 4b: The called CAT service function control module receives the INVITE request, and forwards the INVITE request to the called party (ie, the called user terminal), to step 5b.

Step 5b, the called party receives the INVITE request, and returns a provisional response (Provisional Response), to step 6b.

Step 6b: The called CAT service function control module receives the temporary response, and then provides the called CAT service in an application server mode, and carries the SDP of the called user CAT service with the Content-Disposition as the Early Session in the message body of the temporary response. (offer) information. Go to step 7b.

Step 7b: After receiving the temporary response, the calling CAT service function control module selects the high priority CAT service. The process in which the calling CAT service function control module selects the high-priority CAT service is as described in step 7 in FIG. 4 above, and the description thereof will not be repeated here. When the calling CAT service function control module determines that the calling user's CAT service has a high priority, whether the calling user's terminal supports the Early Session or supports the Ρ-Early-Media, the process proceeds to step 8b1.

When the calling CAT service function control module determines that the called user CAT service has a high priority and the calling user's terminal supports the Early Session, the process proceeds to step 8b2.

Step 8b1, the calling CAT service function control module sets the Content-Disposition of the PRACK request to the SDP (Answer) information of the Early Session, sets the port address of all the media lines in the SDP information to 0, and then, to the called party. The CAT service function control module sends the PRACK request. After the called CAT service function control module receives the PRACK request, it does not perform the operation of providing the called user CAT service. The calling CAT service function control module normally performs the subsequent operation of providing the calling user CAT service.

Step 8b2: The calling CAT service function control module directly forwards the temporary response. Moreover, the calling CAT service function control module no longer performs the subsequent operation of providing the calling user CAT service.

The flow of the method for implementing the customized ring back tone service provided in the fourth method is as shown in FIG. 6.

In Figure 6, the first step, the calling CAT service function control module receives the INVITE request,

The INVITE request carries the SDP (Offfer) information of the normal session, to step 2.

Step 2: The calling CAT service function control module interacts with the calling media resource function module to obtain the IP address and port address of the calling media resource function module. Go to step 3 o

Step 3. The calling CAT service function control module will perform the normal session in the INVITE request.

The IP address and port address of the SDP are modified to the IP address and port address of the calling media resource function module obtained in step 2 above, and the INVITE request is forwarded. Go to step 4.

Step 4: The called CAT service function control module receives and forwards the INVITE request to the called party. Go to step 5.

Step 5: After receiving the INVITE request, the called party returns a temporary response. The called CAT service function control module receives the temporary response, and the called CAT service function control module can decide whether to adopt the The same way to provide the called user CAT service. When the called CAT service function control module decides to use the gateway mode to provide the called user CAT service, the process proceeds to step 6a. When the called CAT service function control module decides to use the application server mode to provide the called user CAT service, it proceeds to step 6b.

Step 6a: The called CAT service function control module sends a temporary response carrying the P-Early-Media header field to the calling CAT service function control module. Go to step 7.

Step 6b: The called CAT service function control module sends a temporary response of the SDP (offer) information of the called party CAT service with the Content-Disposition set to the Early Session to the calling CAT service function control module. Go to step 7.

Step 7. After receiving the temporary response, the calling CAT service function control module selects the high priority CAT service. The process in which the calling CAT service function control module selects the high-priority CAT service may be as described in the above FIG. 4, and the description is not repeated here.

When the calling CAT service function control module determines that the called user's CAT service has a high priority and determines that the temporary response carries the P-Early-Media header field, the process proceeds to step 8al.

When the calling CAT service function control module determines that the calling user CAT service has a high priority and determines that the temporary response carries the P-Early-Media header field, the process proceeds to step 8a2.

When the calling CAT service function control module determines that the called user CAT service has a high priority and determines that the temporary response carries the SDP (offer) information of the called party CAT service with the Content-Disposition set to the Early Session, Step 8bl.

When the calling CAT service function control module determines that the calling user CAT service has a high priority and determines that the temporary response carries the SDP (offer) information of the called party CAT service whose Content-Disposition is set to the Early Session, Step 8b2.

Step 8al: The calling CAT service function control module interacts with the calling media resource function module to obtain the IP address and port address of the calling media resource function module. Go to step 9al.

Step 9al, the calling CAT service function control module modifies the IP address and port address of the SDP in the received temporary response to the calling media resource function module obtained in step 8al The IP address and port address of the block. Go to step 10al.

Step 10al: The calling CAT service function control module interacts with the calling media resource function module to request the media resource function module to receive the media stream received from the IP address and port address determined by the negotiation in step 2. The IP address and port address determined through the negotiation of step 8al are sent to the terminal of the calling user. The calling CAT service function control module no longer performs the operation of providing the calling CAT service.

Step 8a2: The calling CAT service function control module interacts with the calling media resource function module to request the calling media resource function module to discard the media stream received by the IP address and port address determined by the negotiation in step 2. , or ask the calling media resource function module to close the IP address and port address determined in step 2. The calling CAT service function control module normally performs the operation of providing the calling CAT service.

Step 8b1, the calling CAT service function control module directly forwards the received temporary response to the calling user's terminal. The calling CAT service function control module no longer performs the operation of providing the calling CAT service.

Step 8b2, the calling CAT service function control module will request the content of the PRACk-

Disposition is set to the SDP (Answer) information of the Early Session, and the port address of all the media lines in the SDP (Answer) information of the Early Session is set to 0, and the PRACk request is sent to the called CAT service function control module. The calling CAT service function control module performs the operation of providing the calling CAT service normally.

The flow of the method for implementing the customized ring back tone service provided in the fifth mode is as shown in FIG. 7.

In Figure 7, step 1. The calling CAT service function control module receives the INVITE request, and proceeds to step 2.

Step 2: The calling CAT service function control module determines the terminal capability of the calling user. The method for the calling CAT service function control module to determine the terminal capability of the calling user may be as described in step 2 in FIG. 4 above, and the description is not repeated here.

The calling CAT service function control module determines that the calling user's terminal only supports P-Early- When you are in Media, go to step 3a. When the calling CAT service function control module determines that the calling user's terminal supports the Early Session, it proceeds to step 3b.

Step 3: The calling CAT service function control module interacts with the calling media resource function module to obtain the IP address and port address of the calling media resource function module. Go to step 4a.

Step 4a: The calling CAT service function control module modifies the IP address and port address of the SDP of the normal session in the INVITE request to the IP address and port address of the calling media resource function module obtained in the foregoing step 2, and forwards The INVITE request. Go to step 5a.

Step 5a: The called CAT service function control module receives and forwards the INVITE request to the called party. Go to step 6a.

Step 6a: After the called party receives the INVITE request, it returns a temporary response. Go to step 7a. Step 7a: The called CAT service function control module sends a temporary response carrying the P-Early-Media header field to the calling CAT service function control module. Go to step 8a.

Step 8a: After receiving the temporary response, the calling CAT service function control module selects the high priority CAT service. The process in which the calling CAT service function control module selects the high-priority CAT service may be as described in the above FIG. 4, and the description is not repeated here.

When the calling CAT service function control module determines that the called user's CAT service has a high priority and determines that the temporary response carries the P-Early-Media header field, the process proceeds to step 9al.

When the calling CAT service function control module determines that the calling user CAT service has a high priority and determines that the temporary response carries the P-Early-Media header field, the process proceeds to step 9a2.

Step 9al: The calling CAT service function control module interacts with the calling media resource function module to obtain the IP address and port address of the calling media resource function module. To l l Oal o

Step 10al: The calling CAT service function control module modifies the IP address and port address of the SDP in the received temporary response to the IP address and port address of the calling media resource function module obtained in step 9al. Go to l lal. Step l lal, the calling CAT service function control module and the calling media resource function module perform information interaction, so that the calling media resource function module requests the media received from the IP address and port address determined by the step 3a negotiation. The flow is sent to the terminal of the calling user through the IP address and port address determined by the negotiation of step 9al. The calling CAT service function control module no longer performs the operation of providing the calling CAT service.

Step 4b: The called CAT service function control module receives and forwards the INVITE request to the called party. Go to step 5b.

Step 5b: After the called party receives the INVITE request, it returns a temporary response. Go to step 6b. Step 6b: The called CAT service function control module sends a temporary response of the SDP (offer) information of the called party CAT service with the Content-Disposition set to the Early Session to the calling CAT service function control module. Go to step 7b.

Step 7b: After receiving the temporary response, the calling CAT service function control module selects the high priority CAT service. The process in which the calling CAT service function control module selects the high-priority CAT service may be as described in the above FIG. 4, and the description is not repeated here.

Step 8b2, the calling CAT service function control module will request the Content of the PRACk- Disposition is set to the SDP (Answer) information of the Early Session, and the port address of all media lines in the SDP (Answer) information of the Early Session is set to 0, and the PRACk request is sent to the called CAT service function control module. The calling CAT service function control module normally performs the operation of providing the calling CAT service.

In the above description of the figure, the calling CAT service function control module and the called CAT service function control module are taken as an example for description. The calling CAT service function control module and the called CAT service function control module may also be replaced by the called CAT service function control module and the third party CAT service function control module of the call transfer, and the calling media resource function module needs to be replaced by Called the media resource function module, the called party needs to be replaced with a third party for call forwarding, and the calling party needs to be replaced with the called party. The implementation process is basically the same, and the description will not be repeated here.

The following provides a specific application scenario as an example, and describes the embodiments provided by the present invention with reference to the accompanying drawings.

CAT business implementation method.

Embodiment 1 The calling CAT service function control module is located in the CAT AS of the calling service, and the called CAT service function control module is located in the CAT AS serving the called party. The CAT AS serving the calling party selects the caller's CAT service priority parameter based on the calling user's setting parameters stored on the CAT AS, and adds the CAT parameter in the header field Reject-Contact of the INVITE request; The CAT AS of the party service does not apply for CAT media resources after identifying the CAT parameters. In the above case, the implementation process of the CAT service is as shown in FIG. 8.

It should be noted that some message transmission processes are omitted in the flow description of FIG. 8 described below, for example, message transmission of entities such as P-CSCF, S-CSCF, I-CSCF, and MRF is omitted.

In Figure 8, step S001, UE#1 (calling party) sends an INVITE request. To step S002 o

Step S002: The CAT AS serving the calling party selects a high priority CAT service according to the stored calling user setting parameter, and the calling user CAT service has a high priority in the calling user setting parameter, therefore, the calling party The CAT AS of the party service determines that the calling user's CAT service has a high priority. Go to step S003. Step S003: The CAT AS serving the calling party adds a CAT parameter in the Reject-Contact header field of the received INVITE request, and then forwards the INVITE request to the CAT AS serving the called party. Go to step S004.

Step S004: The CAT AS serving the called party receives the INVITE request, and determines, according to the CAT parameter in the Reject-Contact header field of the INVITE request, that the calling user CAT service has a high priority, then the CAT AS serving the called party The INVITE request is forwarded directly to the UE#2 (called party), and the CAT AS serving the called party does not request the media resource of the CAT service for the called user CAT service. Go to step S005.

Step S005, UE#2 rings, and returns 180 temporary response. Go to step S006. It should be noted that the 180 temporary response in step S005 may also be a temporary response of 183.

Step S006: The CAT AS serving the called party receives and forwards the 180 temporary response. Go to step S007.

Step S007: The CAT AS serving the calling party receives the 180 temporary response, and provides the calling user CAT service to the UE#1 in the gateway mode or the application server mode.

It should be noted that, before step S002 of FIG. 8, the CAT AS serving the calling party can perform the judgment operation of the terminal capability of the calling user, and it is determined that the terminal of the calling user only supports P-Early- In the case of Media, the subsequent steps S002 to S007 are performed. When it is determined that the calling user's terminal supports the application server mode, the INVITE request is directly forwarded.

Embodiment 2: The calling CAT service function control module is located in the CAT AS of the calling service. The CAT AS serving the calling party selects the caller's CAT service priority parameter based on the calling user's setting parameter stored on the CAT AS, and adds the CAT parameter in the header field Reject-Contact of the INVITE request; the MGCF identifies the After the CAT parameter, the CAT parameter is carried in the Optional Forward Call IndiCATors field in the IAM and sent to the PSTN. In the above case, the implementation process of the CAT service is as shown in FIG.

It should be noted that some message transmission processes are omitted in the process description of FIG. 9 described below, for example, Message transmission by entities such as P-CSCF, S-CSCF, and BGCF is omitted.

Figure 9. Step S101, UE#1 (calling party) sends an INVITE request. Go to step S102. Step S102, the CAT AS serving the calling party selects the high priority CAT service according to the stored calling user setting parameter, and the calling user CAT service has a high priority in the calling user setting parameter, therefore, the calling party The CAT AS of the party service determines that the calling user's CAT service has a high priority. Go to step S103.

Step S103: The CAT AS serving the calling party adds a CAT parameter in the Reject-Contact header field of the received INVITE request, and then forwards the INVITE request to the MGCF. Go to step S104 o

Step S104, the MGCF receives the INVITE request, and according to the Reject- request of the INVITE

The CAT parameter in the Contact header field determines that the calling user CAT service has a high priority, and the ij MGCF sets the G bit of the Optional Forward Call Indicators field in the IAM to "1" to indicate the primary. Call the user CAT service with high priority. The MGCF sends the IAM to the PSTN. Go to step S105.

Step S105: After receiving the IAM, the PSTN returns an Address Complete Message (ACM). Go to step S106.

Step S106: After receiving the ACM, the MGCF sends a 180 temporary response to the CAT AS serving the calling party. Go to step S107.

Step S107: The CAT AS serving the calling party receives the 180 temporary response, and provides the calling user CAT service to the UE#1 in the gateway mode or the application server mode.

Embodiment 3: The called CAT service function control module is located in the CAT AS serving the called party. The IAM sent by the PSTN to the MGCF carries the CAT priority indication information indicating that the calling user CAT service has a high priority in the PSTN, and the MGCF identifies the CAT priority indication information, determines that the calling user CAT service has a high priority, and sends the header field. Reject-Contact carries an INVITE request with a CAT parameter. In the above case, the implementation process of the CAT service is as shown in FIG.

It should be noted that some message transmission processes are omitted in the process description of FIG. 10 described below. The message transmission of entities such as P-CSCF and S-CSCF is omitted.

In Figure 10, step S201, PSTN will use IAM Optional Forward Call Indicators

The G bit of the (optional forward call indication) field is set to "1" to indicate that the calling subscriber's CAT service in the PSTN has a high priority, and the PSTN sends the IAM to the MGCF. Go to step S202.

Step S202: The MGCF receives the IAM, and according to the Optional Forward Call of the IAM

The G bit of the Indicators field indicates that the calling party CAT service in the PSTN has a high priority. Then, the MGCF adds a CAT parameter to the Reject-Contact header field in the INVITE request to indicate the PSTN caller. The user CAT service has a high priority. The MFCF sends an INVITE request to the CAT AS serving the called party. Go to step S203.

Step S203, receiving, by the CAT AS of the called service, an INVITE request, and determining, according to the CAT parameter in the Reject-Contact header field of the INVITE request, that the calling user CAT service has a high priority, and thereafter, directly serving the CAT AS of the called service. The INVITE request is forwarded to UE#2 (the called party), and the operation of requesting the media resource for the called user CAT service is not performed.

Embodiment 4: The calling CAT service function control module is located in the CAT AS of the calling service, and the called CAT service function control module is located in the CAT AS serving the called party. The CAT AS serving the calling party selects the caller's CAT service priority based on the calling user setting parameters or local policies stored on the CAT AS. After the CAT AS of the calling service determines that the terminal of the calling user does not support the Early Session, the Early Session is added in the Support header field of the INVITE request. In the above case, the implementation process of the CAT service is as shown in FIG.

It should be noted that some message transmission processes are omitted in the flow description of FIG. 11 described below, for example, message transmission of entities such as P-CSCF, S-CSCF, I-CSCF, and MRF is omitted.

In Figure 11, step S301, UE#1 sends an INVITE request to the CAT AS served by the calling party, and the message body of the INVITE request carries the SDP (offer) information of the normal session. Go to step S302.

Step S302, the CAT AS serving the calling party receives the INVITE request, and determines the

Whether the Early Session parameter is carried in the Supported header field of the INVITE request, After the Early Session parameter is not carried, it is determined that the calling user's terminal does not support the Early Session. Go to step S303.

Step S303: The CAT AS of the calling service adds an Early Session parameter in the Supported header field of the INVITE request, and then sends the INVITE request to the CAT AS serving the called party. Go to step S304.

Step S304: After receiving the INVITE request, the CAT AS serving the called party forwards the INVITE request to UE#2. Go to step S305.

Step S305, UE#2 rings, and returns 180 temporary response, wherein the Content-Disposition in the 180 temporary response is set to the SDP (answer) information of the normal session of the session, and the to tag parameter of the TO header field is set to tag=31415286. . It should be noted that the 180 temporary response here can also be a temporary response of 183. Go to step S306.

Step S306, since the CAT AS serving the called party receives the Early Session parameter in the Supported header field of the INVITE request received in step 304, the CAT AS serving the called party adopts the application server mode to provide the called party. The user CAT service, that is, the CAT AS serving the called party adds the SDP (offer) information of the called party CAT service whose Content-Disposition is the Early Session in the 180 response, and then forwards the 180 to the calling party's CAT AS. Temporary response. Go to step S307.

Step S307: The CAT AS serving the calling party determines that the called user CAT service has a high priority according to the calling user setting parameter stored on the CAT AS or the operator's policy. Go to step S308 o

Step S308, because the called user CAT service has a high priority, the calling user's terminal only supports the P-Early-Media header field, and the 180 temporary response carries the CAT service of the called party whose Content-Disposition is the Early Session. The SDP information and the Content-Disposition are the SDP information of the normal session returned by the called party of the session. Therefore, the CAT AS of the calling party stores the SDP information of the normal session returned by the called party of the session by the Content-Disposition. This part of the message in the 180 temporary response is deleted, and the Content-Disposition is Early. The Content-Disposition of the CAT service SDP information of the called party of the Session is changed to session, and the header field Ρ-Early-Media is added in the 180 temporary response. The parameter of the header field is set to "sendrecv", and then the temporary response is 180. The to tag parameter of the TO header field is modified to be the locally generated tag=583558 of the CAT AS served by the calling party, and the CAT AS served by the calling party forwards the 180 temporary response to UE#1. Go to step S309.

Step S309, UE#1 receives 180 a temporary response and sends a PRACK request. Go to step S310 o

Step S310: The CAT AS serving the calling party receives and forwards the PRACK request, and the content of the PRACK request uses the Content-Disposition as the Early Session to carry the SDP information of the ordinary session in step S301. Go to step S311.

Step S311: The CAT AS serving the called party receives the PRACK request, deletes the SDP message body carried in the PRACK request, and forwards the PRACK request to UE#2. Go to step S312 o

Step S312: After receiving the PRACK request, UE#2 returns a 200 OK response. Go to step S313 o

Step S313, receiving and forwarding a 200 OK response for the CAT AS served by the called party, to step S314 o

Step S314, the CAT AS serving the calling party receives the 200 OK response, and forwards the 200 OK response to UE#1. Go to step S315.

Step S315: The CAT AS serving the called party provides the CAT service to the calling user.

It should be noted that, in step S302, if the CAT AS served by the calling party determines that the terminal of the calling user supports the Early Session, then in step S303, the CAT AS serving as the calling service can directly forward and receive the CAT AS. The INVITE request is received, and, in step S308, the CAT AS serving the calling party does not need to perform a modification operation, and directly forwards the 180 temporary response it received in step S306.

Embodiment 5: The calling CAT service function control module is located in the CAT AS of the calling service. The called CAT service function control module is located in the CAT AS serving the called party. The CAT AS serving the calling party selects to determine the calling subscriber CAT service priority according to the calling user setting parameters or the local policy stored on the CAT AS. The CAT AS of the calling service determines that the calling party's terminal supports the Early Session. In the above case, the implementation process of the CAT service is as shown in FIG.

It should be noted that some message transmission processes are omitted in the flow description of FIG. 12 described below, for example, message transmission of entities such as P-CSCF, S-CSCF, I-CSCF, and MRF is omitted.

In FIG. 12, in step S401, UE#1 sends an INVITE request to the CAT AS served by the calling party. Since UE#1 supports the Early Session, the Supported header field of the INVITE request includes the Early Session parameter. Go to step S402.

Step S402: The CAT AS serving the calling party receives the INVITE request, and determines, according to the Early Session parameter included in the Supported header field of the INVITE request, that the calling user's terminal supports the Early Session. Go to step S403.

Step S403: The CAT AS serving the calling party directly forwards the received INVITE request to the CAT AS serving the called party, to step S404.

Step S404: After receiving the INVITE request, the CAT AS serving the called party forwards the INVITE request to UE#2. Go to step S405.

Step S405, UE#2 rings, and returns 180 temporary response, wherein the Content-Disposition in the 180 temporary response is set to the SDP (answer) information of the normal session of the session, and the to tag parameter of the TO header field is set to tag=31415286 . It should be noted that the 180 temporary response here can also be a temporary response of 183. Go to step S406.

Step S406, since the CAT AS serving the called party receives the Early Session parameter in the Supported header field of the INVITE request received in step 304, the CAT AS serving the called party adopts the application server mode to provide the called party. The user CAT service, that is, the CAT AS serving the called party, adds the SDP (offer) information of the called party CAT service whose Content-Disposition is the Early Session to the 180 response, and then forwards the information to the calling party's CAT AS. The 180 temporary response. Go to step S407.

Step S407: The CAT AS serving the calling party determines that the calling user CAT service has a high priority according to the calling user setting parameter stored on the CAT AS or the operator's policy. Go to step S408 o

Step S408, sending a Content-Disposition to the CAT AS serving the calling party as Early

The PRACK request for the SDP (Answer) message of the session, in which the port address of all the media lines in the SDP (Answer) message is set to 0, to indicate the called user CAT service provided by the CAT AS serving the called party. Go to step S409.

Step S409, the CAT AS serving the called party receives the PRACK request, and according to the Content-Disposition in the PRACK request, the port address of all the media lines of the SDP information of the Early Session is set to 0, and the calling party refuses to receive the called party. The CAT service of the user, therefore, the CAT AS serving the called party does not apply for the media resource for the called user CAT service, and the CAT AS serving the called party deletes the SDP message body of the PRACK request, and then, to the UE# 2 Forward the PRACK request. Go to step S410.

Step S410: After receiving the PRACK request, UE#2 returns a 200 OK response. To the step

S41 1 o

Step S411: Receive and forward a 200 OK response to the CAT AS served by the called party, to step S412 o

Step S412: The CAT AS serving the calling party receives the 200 OK response, and provides the calling user CAT service to the calling user by using the application server mode.

It should be noted that, in step S402, if the CAT AS served by the calling party determines that the terminal of the calling user does not support the Early Session, then in step S403, the CAT AS served by the calling party is in the INVITE. The Supported header field of the request adds the Early Session parameter, and then forwards the INVITE request. In addition, if, in step S407, the CAT AS of the calling party service selects the called user CAT service priority, the CAT AS served by the calling party does not perform step S408, but directly forwards it in the step The temporary response received in S406, then, The CAT AS serving the called party adopts the application server mode to provide the called user CAT service to the calling user.

Embodiment 6: The calling CAT service function control module is located in the CAT AS of the calling service, the called CAT service function control module is located in the CAT AS serving the called party, and the calling media resource function module is located in the calling party service. In the MRF. The CAT AS serving the calling party selects to determine the high priority of the called subscriber CAT service based on the calling subscriber setting parameters or local policies stored on the CAT AS. The CAT AS serving the calling party modifies the IP address and port address of the SDP in the INVITE request to the IP address and port address of the MRF served by the calling party. The CAT AS serving the called party uses the gateway mode to provide the called user with the CAT service of the called party. In the above case, the implementation process of the CAT service is as shown in Figure 13.

It should be noted that some message transmission processes are omitted in the flow description of FIG. 13 described below, for example, message transmission of entities such as P-CSCF, S-CSCF, and I-CSCF is omitted.

Figure 13, step S501, UE#1 sends an INVITE request carrying the SDP (offer) information of the normal session in the message body. Go to step S502.

Step S502: The CAT AS serving the calling party receives the INVITE request, and negotiates and obtains the IP address and port address of the MRF served by the calling party by interacting with the information of the MRF serving the calling party. Go to step S503.

Step S503, the CAT AS serving the calling party changes the IP address and port address of the SDP information in the message body of the INVITE request to the IP address and port address negotiated in step S502, and then, the calling party The CAT AS of the party service forwards the INVITE request. Go to step S504 o

Step S504: Receive and forward an INVITE request for the CAT AS served by the called party. Go to step S505.

Step S505, UE#2 rings after receiving the INVITE request, and returns 180 temporary response. Go to step S506. It should be noted that the 180 temporary response here can also be a 183 temporary response. Step S506, the CAT AS serving the called party receives the 180 temporary response, and provides the called user CAT service to the calling user in the gateway mode, and the CAT AS serving the called party carries the P-Early- in the 180 temporary response. The Media header field, and then forwards the 180 temporary response to the CAT AS serving the calling party, to step S507.

Step S507: The CAT AS serving the calling party selects the called user CAT service priority according to the calling user setting parameter or the local policy stored on the CAT AS. Go to step S508.

Step S508: The CAT AS serving the calling party exchanges the information of the MRF served by the calling party to obtain the IP address and port address of the MRF served by the calling party. To step S509 o

Step S509, because the called user CAT service has a high priority, therefore, the calling party services

The CAT AS changes the IP address and port address of the SDP in the 180 temporary response to the IP address and port address negotiated in step S508, and then the CAT AS serving the calling party forwards the 180 temporary to UE#1. response. Go to step S510.

Step S510, the CAT AS served by the calling party performs information interaction with the MRF served by the calling party, so that the MRF that requests the calling party service receives the media from the IP address and port address negotiated in step S502. The flow is sent to the calling user through the IP address and port address negotiated in step S508. Go to step S511.

Step S511, the CAT AS serving the called party provides the called user with the called user CAT industry. In step S506, if the CAT AS serving the called party adopts the application server mode to provide the CAT service, That is, the Content-Disposition in the 180 temporary response carries the SDP (offer) information of the CAT service of the called user in the Early Session mode, and the CAT AS serving the calling party may not perform step S508 and step S510, but After step S507, directly executing step S509 forwards the 180 temporary response to the UE #1, and then directly executes step S511 to directly provide the called party CAT service to the calling party by the CAT AS serving the called party.

In addition, in step S507, if the CAT AS served by the calling party selects the calling user The CAT service has a high priority, and in step S509, the CAT AS serving the calling party may provide the calling user CAT service to the calling user in the gateway mode or the application server mode; and in step S510, the calling party The CAT AS of the party service interacts with the MRF served by the calling party to request that the MRF served by the calling party discard the media stream received from the IP address and port address negotiated in step S502.

Further, before step S502, the CAT AS serving the calling party may first determine the terminal capability of the calling user, and after determining that the terminal of the calling user only supports P-Early-Media, perform the subsequent process.

Embodiment 7: The calling CAT service function control module is located in the CAT AS of the calling service, the called CAT service function control module is located in the CAT AS serving the called party, and the calling media resource function module is located in the calling party service. In the MRF. The CAT AS serving the calling party selects to determine the priority of the calling subscriber CAT service based on the calling subscriber setting parameters or local policies stored on the CAT AS. The CAT AS serving the calling party modifies the IP address and port address of the SDP in the INVITE request to the IP address and port address of the MRF served by the calling party. The CAT AS serving the called party uses the application server mode to provide the called user with the called user CAT service. In the above case, the implementation process of the CAT service is as shown in FIG.

It should be noted that some message transmission processes are omitted in the flow description of FIG. 14 described below, for example, message transmission of entities such as P-CSCF, S-CSCF, and I-CSCF is omitted.

Figure 14. Step S601: UE#1 sends an INVITE request carrying the SDP (offer) information of the normal session in the message body. Go to step S602.

Step S602: The CAT AS serving the calling party receives the INVITE request, and obtains an IP address and a port address of the MRF served by the calling party by interacting with the information of the MRF serving the calling party. Go to step S603.

Step S603, the CAT AS serving the calling party changes the IP address and port address of the SDP information in the message body of the INVITE request to the IP address and port address negotiated in step S602, and then, the calling party The CAT AS of the party service forwards the INVITE request. To the step S604 o

Step S604: Receive and forward an INVITE request for the CAT AS served by the called party. Go to step S605.

Step S605: UE#2 rings after receiving the INVITE request, and returns 180 temporary response. Go to step S606. It should be noted that the 180 temporary response here can also be 183 temporary response.

Step S606, the CAT AS serving the called party receives the 180 temporary response, and the CAT AS serving the called party adopts the application server mode to provide the called user CAT service to the UE#1, and the CAT AS serving the called party as the Content -Disposition is the Early Session mode carrying the SDP (offer) information of the called user's CAT service in the 180 temporary response. Go to step S607.

Step S607: The CAT AS serving the calling party selects the calling user CAT service priority according to the calling user setting parameter or the local policy stored on the CAT AS. Go to step S608.

Step S608, the CAT AS serving the calling party sets the Content-Disposition in the PRACK request to the SDP (Answer) information of the Early Session, and the port address of all the media lines in the SDP information is set to 0 to indicate the rejection. The called user CAT service provided by the CAT AS serving the called party. The PRACK request is sent by the CAT AS serving the calling party. Go to step S609.

Step S609, the CAT AS serving the called party receives the PRACK request, and after determining that the Content-Disposition in the PRACK request is the port address of the SDP of the Early Session is set to 0, determining that the calling user refuses to receive the called user CAT Service, therefore, the CAT AS serving the called party does not request the CAT service media resource for the called user CAT service, and deletes the SDP message body in the PRACK request, and then forwards the PRACK request to UE#2. To step S610 o

Step S610: The CAT AS serving the calling party provides the calling user CAT service to the calling user by using a gateway mode or an application server mode.

As can be seen from the above description, the embodiments of the present invention pass through the situation in which there are multiple customized ring back tone services. In this case, the high-priority customized ring back tone service is selected, and the corresponding operation is triggered, which can allow the selected ring back tone service, prohibit the unselected customized ring back tone service, and thus can subscribe in multiple parties.

In the case of the CAT service, the problem that the calling party receives a plurality of mixed ring back tones is avoided, the flexibility of the customized ring back tone service is improved, and the user experience of the CAT service is improved. The embodiments of the present invention provide various technical solutions for implementing a customized ring back tone service, which can be applied to a variety of different application scenarios to meet various network requirements.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary hardware platform, and of course, all can be implemented by hardware, but in many cases, the former is better. Implementation. Based on such understanding, all or part of the technical solution of the present invention contributing to the background art may be embodied in the form of a software product, which may be stored in a storage medium such as a ROM/RAM, a magnetic disk, an optical disk, or the like. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.

The device for implementing the customized ring back tone service provided by the embodiment of the present invention will be described below with reference to FIG.

The device for implementing the customized ringback tone service provided by the embodiment of the present invention may be located in the CAT AS in the IMS domain, or in the MSC in the CS domain, or in the MGCF. Of course, it can also be located in other network devices on the network side. The customized ring back tone service implementation device in Figure 15 includes: a selection module and an execution module.

During the call, the selection module may select a custom ringback tone service with a high priority from at least two custom ringback tone services of the call after receiving the request (eg, an INVITE request, etc.). For example, the selection module selects a high priority CAT service from the calling CAT service, the called CAT service, and the call transfer third party CAT service; or selects a high priority CAT service from the called CAT service and the called CAT service. Or choose a high priority CAT service from the called CAT service and the call transfer third party CAT service. Selecting a module can take multiple strategies To choose a high priority custom ring back tone service. For example, the selection module may select a high priority custom ring back tone service according to any of the eight policies described in the above embodiments. Embodiments of the present invention do not limit the specific manifestation of a policy for selecting a high priority custom ring back tone service. The specific implementation manner of the selection module to select the high-priority CAT service is as described in the foregoing method implementation manner, and the description is not repeated here.

After the selection module selects the high priority CAT service, the execution module obtains the selection result information of the selection module, and triggers the permission to play the selected customized ring back tone service for the calling user according to the selection result information, prohibiting the calling party The user plays the operation of the customized ring back tone service that is not selected. By triggering this operation, the media stream of the selected CAT service can be transmitted to the terminal of the calling user, and the media stream of the unselected CAT service is not transmitted to the terminal of the calling user.

The triggering performed by the execution module can take many forms. For example, when the priority of the user's customized ringback tone service is high, the execution module notifies the opposite network node that the customized ringback tone service is not provided, and the execution module performs the operation of providing the user's customized ringback tone service on the opposite side; When the priority of the user's custom ringback tone service is high, the execution module notifies the peer network node to provide a customized ring back tone service, and the execution module does not perform the operation of providing the user's customized ring back tone service. For example, when the priority of the user's customized ringback tone service is high, the execution module instructs the media resource function module to discard the received media stream of the customized user's ringback tone service, and the execution module performs the customization of the user on the local side. Operation of the ring tone service; when the priority of the user's customized ring back tone service is high, the execution module allows the media resource function module to normally transmit the media stream of the received user's customized ring back tone service, and the execution module does not execute. Provides operations for custom ringback tone services on the local side. The execution module instructs the media gateway control function entity not to perform the media gating operation for opening the customized ringback tone service media stream to the opposite user, and the execution module performs the provisioning when the priority of the user's customized ringback tone service is high. The operation of the user to customize the ring back tone service is performed. When the priority of the ringback tone service is high, the execution module instructs the media gateway control function entity to perform media gate control for opening the customized ringback tone service media stream for the opposite user. Operation, and the execution module does not perform the operation of providing the user's customized ring back tone service, etc. The above-mentioned side and the opposite side are for the call. For example, when calling a call between the calling user and the called user, the selecting module and the executing module may be located on the network side corresponding to the calling user, that is, the side is Refers to the calling user side and the opposite side refers to the called user side. For example, when the call is a call between the called user and the third party user of the call transfer, the selection module and the execution module may be located on the network side corresponding to the called user, that is, the current side refers to the called user side, and the opposite side is The third-party user in the embodiment of the present invention is the first execution sub-module, the second execution sub-module, the third execution sub-module, the fourth execution sub-module, the fifth execution sub-module, and the sixth executive. The module, the seventh execution sub-module, the eighth execution sub-module, the ninth execution sub-module, the tenth execution sub-module, and the eleventh execution sub-module are at least one sub-module; in addition, the execution module may optionally include Determining at least one of the submodule and the address acquisition submodule.

The first execution sub-module indicates whether the opposite-side network node provides a customized ring-back tone service according to the selection result of the selection module. For example, when the first execution sub-module determines that the user-defined ringback tone service priority is high, the first execution sub-module performs the operation of providing the local user customized ring-back tone service, and directly sends the selected customized back to the opposite-side network node. The information of the ring tone service is used to indicate that the peer network node does not apply for the ring back tone service for the opposite user to apply for the media resource; for example, when the first execution submodule determines that the opposite user has a customized ring back tone service priority, The operation of providing the local user's customized ring back tone service is not performed, and the information of the selected customized ring back tone service is directly sent to the opposite side network node, so as to instruct the opposite side network node to customize the ring back tone service request for the opposite user. For example, the first execution sub-module performs the operation of providing the local user's customized ring back tone service when determining that the user's customized ring back tone service has a high priority, and controls the function entity to the opposite side through the media gateway. The network node sends the information of the selected customized ring back tone service to indicate that the opposite network node does not customize the ring back tone service request for the opposite user. The first execution sub-module does not perform the operation of providing the local user's customized ring back tone service when the priority of the user's customized ring back tone service is high, and the function is controlled by the media gateway control function entity. The side network node sends the information of the selected customized ring back tone service to instruct the peer network node to apply for a ringback tone service for the opposite party. The first execution sub-module may carry the information of the selected customized ring-back tone service in the INVITE message, and the MGCF may carry the information of the selected customized ring-back tone service in the IAM. The specific carrying mode, the message interaction process, and the operations performed after the peer network node receives the message are as described in the foregoing method embodiments, and the description is not repeated here.

In the case that the execution module includes the judgment sub-module, the determination sub-module determines whether the calling user terminal supports the application server mode, and outputs the notification information when the calling user terminal does not support the application server mode, the first executable After receiving the notification of the judgment sub-module, the module performs the above operation according to the selection result of the selection module. The method for judging the sub-module to determine that the calling user terminal releases the support application server mode is as described in the foregoing method embodiment, and the description thereof will not be repeated here.

The second execution sub-module indicates, according to the selection result of the selection module, whether the media gateway control function entity opens the media gating. For example, when the priority of the user-defined ringback tone service is high, the second execution sub-module performs an operation of providing the user-side customized ring-back tone service, and directly sends the selected customization to the media gateway control function entity. The information of the ring back tone service, to indicate that the media gateway control function entity does not perform the media gating operation of opening the media gateway; for example, when the second execution sub-module determines that the opposite user's customized ring back tone service has a high priority The operation of providing the user's customized ring back tone service is not performed, and the information is directly sent to the media gateway control function entity to instruct the media gateway control function entity to perform the media gating operation of opening the media gateway.

The second execution sub-module may carry the information of the selected customized ring back tone service in the INVITE message. The manner in which the information of the selected ring back tone service is carried in the INVITE message, and the operation performed by the media gateway control function entity are as described in the foregoing method embodiments.

In the case that the execution module includes the determination sub-module, the determination sub-module determines whether the calling user terminal supports the application server mode, and outputs the notification information when the calling user terminal does not support the application server mode, and the second executable After receiving the notification of the judgment sub-module, the module performs the above operation according to the selection result of the selection module. The method for determining that the calling user terminal releases the support application server mode is as described in the foregoing method implementation manner, and is not repeated here. Bright.

a third execution sub-module, configured to indicate, according to the selection result of the selection module, whether the media resource function module discards the customized ring back tone service media stream; for example, when the user has customized the ring back tone service priority, the media resource function module is indicated Discarding the received media stream of the user's customized ringback tone service, and the third execution sub-module performs the operation of providing the local user's customized ringback tone service; when the opposite user customizes the ringback tone service with a high priority, The third execution sub-module allows the media resource function module to normally transmit the media stream of the user's customized ringback tone service, and the third execution sub-module does not perform the operation of providing the user-side custom ringback tone service.

In the case that the execution module includes the determination sub-module, the determination sub-module determines whether the calling user terminal supports the application server mode, and outputs the notification information when the calling user terminal does not support the application server mode, and the third executable After receiving the notification of the judgment sub-module, the module performs the above operation according to the selection result of the selection module. The method for judging the sub-module to determine that the calling user terminal releases the support application server mode is as described in the foregoing method embodiment, and the description thereof will not be repeated here.

The fourth execution submodule indicates, according to the selection result of the selection module, whether the media resource function module turns off the receiving address of the customized ring back tone service media stream. For example, when the priority of the user's customized ringback tone service is high, the media resource function module is instructed to close the receiving address of the media stream that receives the customized ringback tone service of the opposite user, and the fourth execution submodule performs the provision of the local user customization. The operation of the ring back tone service. The fourth execution sub-module allows the media resource function module to normally transmit the media stream of the received user-backed ringback tone service, and the fourth execution sub-module does not execute, when the priority of the user-defined ringback tone service is high. Provides operations for custom ringback tone services on the local side.

In the case that the execution module includes the determination sub-module, the determination sub-module determines whether the calling user terminal supports the application server mode, and outputs the notification information when the calling user terminal does not support the application server mode, and the fourth executive After receiving the notification of the judgment sub-module, the module performs the above operation according to the selection result of the selection module. The method for determining that the calling user terminal releases the support application server mode is as described in the foregoing method implementation manner, and is not repeated here. Bright.

When the selection module determines that the user-defined ringback tone service priority is high, the selection module sends a media stream rejecting the customized ringback tone service to the opposite network node regardless of whether the terminal of the calling user supports the application server mode. The information indicates that the media stream that does not send the customized ring back tone service to the peer network node indicates that the customized ring back tone service provided by the called party's network node is rejected.

The sixth execution sub-module performs a normal message forwarding process by using the application server mode when the selection module determines that the opposite user has a high priority of the customized ringback tone service and determines that the calling user terminal supports the application server mode, and does not The network node on the called side sends the rejection information, and does not provide the calling user with the customized ringback tone service of the calling user. For example, the sixth execution submodule forwards the response message forwarded by the opposite network node to the INVITE request to allow the pair. The side network node sends a media stream of the customized ring back tone service. The specific implementation process is as described in the foregoing method embodiment, and the description is not repeated here.

The seventh execution sub-module needs to forward to the calling user when the selection module determines that the opposite-side user customizes the ring-back tone service has a high priority and determines that the calling user terminal does not support the application server mode. The message is converted into a gateway mode-based message and forwarded, and the application server mode is used to send the permission information to the network node on the called side to indicate the customized ringback tone service of the called user provided by the network node on the called side, and not Providing the calling user with a customized ring back tone service of the calling user, etc.; for example, the seventh executing submodule converts the response message for the INVITE request forwarded by the opposite side network node into a response message for the INVITE request based on the gateway mode. And forwarding the converted response message, and sending, to the opposite network node, the application server mode to send the permission information to the network node on the called side, to instruct the opposite network node to send the media of the customized ring back tone service by using the application server mode. flow. The specific implementation process is as described in the foregoing method embodiment, and the description is not repeated here.

The eighth execution sub-module, in the case that the opposite-side network node adopts the gateway mode to provide the customized ring-back tone service, and the selection module determines that the opposite-side user customizes the ring-back tone service has a high priority, the eighth execution sub-module and the local-side media resource The function module exchanges information to obtain the function mode of the media resource on the local side. The block outputs the address information (second address information) of the media stream of the customized ring back tone service, and then informs the terminal of the user of the local side of the second address information, and indicates that the media resource function module of the local side is received from the first address. The media stream of the customized ring back tone service is sent to the calling user through the second address, and the eighth execution submodule does not perform the operation of providing the customized ring back tone service of the user on the side. The gateway mode of the peer network node may be that the peer network node actively adopts the gateway mode, or may adopt the gateway mode passively according to the message sent by the eighth execution submodule. In this implementation, the predetermined address may be provided by the address acquisition submodule to the eighth execution submodule. For example, the address obtaining sub-module negotiates and acquires the first address information by performing information exchange with the local media resource function module when the device that the device is in the INVITE request and the calling user terminal does not support the application server mode. The first address information may be an IP address and port address information. After the first address information is obtained by negotiation, the eighth execution submodule may notify the network node of the opposite side of the first address information. The manner of the notification may be: after receiving the INVITE message, the eighth execution sub-module carries the first address information in the INVITE message and sends the message to the network node on the called side. The embodiment of the present invention does not exclude the eighth execution sub-module from using other messages to notify the network node on the called side of the implementation of the first address information. The specific implementation process is as described in the foregoing method implementation manner, and the description is not repeated here.

The ninth execution sub-module indicates that the media resource function module discards the reception from the predetermined address when the opposite-side network node provides the customized ring-back tone service in the gateway mode, and the selection module determines that the user-defined ring-back tone service priority is high. The customized media stream of the ring back tone service, and the ninth execution submodule does not perform the operation of providing the customized ring back tone service of the user on the side. The gateway mode of the peer network node may be that the peer network node actively adopts the gateway mode, or may adopt the gateway mode passively according to the message sent by the ninth execution submodule. In this implementation, the predetermined address may also be provided by the address acquisition submodule. For example, the address obtaining sub-module negotiates and acquires the first address information by performing information exchange with the local media resource function module when the device that the device is in the INVITE request and the calling user terminal does not support the application server mode. The first address information may be an IP address and port address information. After the negotiation obtains the first address information, the ninth execution The submodule may notify the network node of the opposite side of the first address information. Specifically, as described in the above embodiments, the description will not be repeated here.

a tenth execution sub-module, configured to: when the opposite-side network node adopts an application server mode to provide a customized ring-back tone service, and the selection module determines that the opposite-side user customizes the ring-back tone service has a high priority, the forwarding peer network node sends the packet The response information for the INVITE request is not performed, and the operation of providing the user's customized ring back tone service is not performed. The application server mode of the peer network node may be that the peer network node actively adopts the application server mode, or may adopt the application server mode passively according to the message sent by the tenth execution submodule. Specifically, as described in the above embodiment, the description will not be repeated here.

The eleventh execution sub-module sends a custom ringback tone service to the opposite-side network node when the opposite-side network node provides the customized ring-back tone service in the application server mode, and the selection module determines that the user-defined ring-back tone service priority is high. The information of the ring tone service media stream is used to indicate that the opposite network node does not send the media stream of the customized ring back tone service, and the eleventh execution submodule performs the operation of providing the caller user customized ring back tone service. The application server mode of the peer network node may be that the peer network node actively adopts the application server mode, or may adopt the application server mode passively according to the message sent by the eleventh execution submodule. Specifically, as described in the above embodiment, the description is not repeated here.

While the invention has been described by the embodiments of the present invention, it will be understood that

Claims

Claim

A method for implementing a custom ringback tone service in an IMS domain, comprising: during a call, a network node having a customized ring back tone service control function on a first CAT service side receives a first CAT service from the call Selecting a customized ring back tone service from the first CAT service provided by the side and the second CAT service provided by the second CAT service side;

2. The method according to claim 1, wherein the selecting a customized ring back tone service can be selected according to at least one of the following conditions:

Selecting a high-priority customized ring back tone service according to a customized ring back tone service setting parameter; selecting a high priority customized ring back tone service according to a preset local policy;

Selecting a high priority customized ring back tone service according to the recorded custom ring back tone service selection result;

In the case of call forwarding, select the customized ring back tone service of the called user or the call transfer third party user;

In the case that the called user is concealed, the customized ring back tone service of the calling user is selected; in the case where the call forwarding third party user is hidden, the customized ring back tone service of the calling user or the called user is selected;

Selecting a high-priority custom ringback tone service according to the media format requested by both users of the call;

The customized ring back tone service matched by the media format is selected according to the media format supported by the terminal of the calling user and the media format of multiple customized ring back tone services.

The method according to claim 1, wherein when the first CAT service side selects the first CAT service, the first CAT service is provided to the calling user, and at least one of the following methods is selected to prohibit the second The CAT service side provides the second CAT service to the calling user:

Sending, by the network node, the selected customized ring back tone service information to the second CAT service side Message to indicate that the second CAT service side does not provide CAT services;

The network node discards the second CAT media stream sent by the second CAT service side.

The method of claim 3, wherein the network node sends a message carrying the selected customized ring back tone service information to the second CAT service side, to indicate that the second CAT service side does not provide the CAT service specific. For:

The network node notifies the second CAT service side that the CAT service is provided by the first Cat service side, and the second CAT service side does not provide the second CAT service after receiving the message carrying the selected customized ring back tone service information.

The method of claim 3, wherein before the sending, by the network node, the message carrying the selected customized ring back tone service information to the second CAT service side, the method further includes:

The network node receives the CAT service request sent by the second CAT service side.

The method according to claim 3, wherein the network node discards the second CAT media stream sent by the second CAT service side in a specific manner of at least one of the following:

When one CAT service side is located in the IMS domain and another CAT service side is located in the CS domain, the network node instructs the media gateway control function entity not to open the media gating;

The network node instructs the media resource function module to close the receiving address of the customized ring back tone service media stream.

The method according to claim 6, wherein the network node instructs the media resource function module to close the receiving address of the customized ring back tone service media stream:

The network node instructs the media resource function module to discard the media stream of the customized ringback tone service received from the predetermined address.

8. The method according to claim 1, wherein when the first CAT service side selects the second CAT service, the first CAT service is not provided to the calling user, and at least one of the following methods is selected to the calling party. The terminal provides the second CAT service:

The network node sends a message carrying the selected customized ring back tone service information to the second CAT service side, where the message carrying the selected customized ring back tone service information is used to notify the second CAT industry. Provide CAT business on the service side;

The message carrying the selected customized ring back tone service information is not sent to the second CAT service side, and the CAT service is provided by the second CAT service side;

After receiving the CAT service request sent by the second CAT service side, the network node forwards the CAT service request to the calling user, and the second CAT service side provides the CAT service;

The network node forwards the CAT media stream sent by the second CAT service side to the calling user.

The method of claim 8, wherein the network node sends a message carrying the selected customized ring back tone service information to the second CAT service side, where the selected customized ring back tone service information is carried. The message is used to notify the second CAT service side to provide the CAT service specifically as follows:

Notifying that the first CAT service side is not provided by the network node to the second CAT service side

The CAT service, after receiving the message carrying the selected customized ring back tone service information, the second CAT service side provides the second CAT service to the calling user.

The method according to claim 8, wherein the method is specifically: the network node receives the m _V1 te message, and determines whether the calling user terminal supports the application server mode, and the calling user terminal supports the application. In the server mode, when the second CAT service is selected, the network node does not provide the first CAT service, and the network node forwards the CAT service to the calling user after receiving the CAT service request sent by the second CAT service side. Requesting, the second CAT service side provides the CAT service to the calling terminal,

After receiving the CAT service request sent by the second CAT service side, the network node forwards the CAT service request to the calling user, and the CAT service is provided by the second CAT service side, where the network node receives the second CAT service side. Sending a response message for the INVITE message, and forwarding the response message for the INVITE message sent by the second CAT service side to the calling side, to allow the second CAT service side to send the media stream of the customized ring back tone service.

The method according to claim 8, wherein the method is specifically: the network node receives the m _V1 te message, and determines whether the calling user terminal supports the application server mode, and the calling user terminal does not support In the application server mode, and when the second CAT service is selected, the The network node does not provide the first CAT service, and does not send the message carrying the selected customized ring back tone service information to the second CAT service side, and the second CAT service side provides the CAT service to the calling terminal, wherein, the second CAT is not provided. The service side sends a message carrying the selected customized ring back tone service information, and the CAT service provided by the second CAT service side is specifically: sending the message carrying the selected customized ring back tone service information to the second CAT service side, to the second The CAT service side sends the information in the application server mode to force the second CAT service side to respond to the INVITE message by using the application server mode, and converts the response message for the INVITE message sent by the second CAT service side to the gateway-based mode. Responding to the response message of the INVITE message, forwarding the converted response message to the calling user, and transmitting the permission information to the second CAT service side by using the application server mode, to instruct the second CAT service side to send the customized back in the application server mode. The media stream of the ring tone service.

The method of claim 11, wherein the transmitting the information in the application server mode is specifically:

A support Supported header field carrying an early session Early Session parameter is added to the INVITE message.

The method according to claim 8, wherein the network node forwards the CAT media stream sent by the second CAT service side to the calling user, where the network node obtains the media stream of the customized ring back tone service. And outputting the address information of the media resource function module, and instructing the media resource function module to send the media stream of the customized ring back tone service received from the predetermined address to the calling user by using the address information.

The method according to claim 7 or 13, wherein the predetermined address is: the address information obtained by the network node from the media resource function module after receiving the INVITE message, In addition, the network node updates the address information of the normal session carried in the INVITE message to the acquired address information, so that the second CAT service side sends the CAT service media stream to the acquired address information.

The method according to claim 7 or 13, wherein the predetermined address is: When the network node receives the INVITE message and determines that the calling user terminal does not support the application server mode, and obtains the address information obtained from the media resource function module, the method further includes: the network node: The address information of the normal session carried in the INVITE message is updated to the acquired address information, so that the second CAT service side sends the CAT service media stream to the acquired address information.

The method according to claim 8, wherein the method is specifically: when the second CAT service side provides a customized ring back tone service by using a gateway mode, and the network node selects a second side CAT to provide a service, The network node does not provide the first CAT service, and the network node forwards the CAT media stream sent by the second CAT service side to the calling user to provide the second CAT service to the calling terminal.

The network node forwards the CAT media stream sent by the second CAT service side to the calling user, specifically: acquiring the address information of the media stream output media resource function module of the customized ring back tone service, and indicating that the media resource function module is to be scheduled The media stream of the customized ring back tone service received by the address is sent to the calling user through the address information.

The method according to claim 3 or 8, wherein the information of the selected customized ring back tone service is carried by the header field or the message body of the message carrying the selected customized ring back tone service information. .

The method according to claim 3 or 8, wherein when a CAT service side is located in the IMS domain and another CAT service side is located in the CS domain, the selected custom ringback tone is transmitted to the second CAT service side. The details of the message of the business information are as follows:

And the network node sends the message carrying the selected customized ring back tone service information to the second CAT service side by using the media gateway control function entity.

The method according to claim 18, wherein the information of the selected address ringback tone service sent by the media gateway control function entity to the second CAT service side is carried in the IAM of the initial address message. in.

20. The method of claim 1, wherein the first CAT service side is called The second CAT service side is the called party, or the first CAT service side is the called party, and the second CAT service side is the forward party.

The method according to claim 1, wherein the network node having a customized ring back tone service control function is a mobile switching center in an AS or CS domain.

The method according to claim 1, wherein the network node provides the selected customized ring back tone service to the calling user, and prohibits the calling user from providing the selected customized ring back tone service. The operation further includes: the network node determining whether the calling terminal user supports the application server mode, and when the calling user terminal does not support the application server mode, performing the customized ring back tone service provided to the calling user, prohibiting The caller is provided with an operation of the unselected custom ringback tone service.

The method according to claim 10 or 11, wherein the process of determining, by the network node, the mode of supporting the calling user terminal comprises:

The network node determines the Supported header field in the received INVITE message. When determining that the Supported header field carries the Early Session parameter, it determines that the calling user terminal supports the application server mode. Otherwise, the application server mode is not supported.

24 . A device for implementing a customized ring back tone service, which is characterized by comprising:

a selection module, configured to select a customized ring back tone service with a high priority from at least two customized ring back tone services of the call during a call;

The apparatus according to claim 24, wherein the execution module comprises at least one of the following:

a first execution submodule, configured to indicate, according to a selection result of the selection module, whether the opposite network node provides a customized ring back tone service;

a second execution submodule, configured to indicate a media gateway control function according to a selection result of the selection module Whether the entity opens the media gate;

a third execution submodule, configured to indicate, according to the selection result of the selection module, whether the media resource function module discards the customized ring back tone service media stream;

And a fourth execution submodule, configured to indicate, according to the selection result of the selection module, whether the media resource function module closes the receiving address of the customized ring back tone service media stream.

The device of claim 25, wherein the execution module further comprises: a determining sub-module, configured to determine whether the calling user terminal supports the application server mode, and determine that the calling user terminal does not support the application In the case of the server mode, each submodule is notified to perform an operation.

27. The apparatus of claim 24, wherein the execution module comprises at least one of:

And a fifth execution sub-module, configured to: when the selecting module determines that the user-defined ringback tone service priority is high, sending, to the opposite-side network node, information that denies the custom ringback tone service media stream, to indicate that the opposite-side network node does not send Customizing the media stream of the ring back tone service;

a sixth execution sub-module, configured to: when the selection module determines that the user-side ringback tone service has a high priority, and determines that the calling user terminal supports the application server mode, the user does not provide the user-side customized ringback tone service. And forwarding a response message for the INVITE message forwarded by the opposite network node, to allow the opposite network node to send the media stream of the customized ring back tone service;

a seventh execution sub-module, configured to: when the selection module determines that the opposite user has a high priority of the ringback tone service, and determines that the calling user terminal does not support the application server mode, the user does not perform the custom ringback tone provided by the user. The operation of the service, the response message for the INVITE message forwarded by the opposite network node is converted into a response message for the INVITE message based on the gateway mode, the converted response message is forwarded, and the application server is sent to the opposite network node. The mode sends permission information to the network node on the called side to instruct the opposite network node to send the media stream of the customized ring back tone service in the application server mode.

28. The apparatus of claim 24, wherein the execution module comprises the following at least one:

The eighth execution sub-module is configured to: when the opposite-side network node adopts a gateway mode to provide a customized ring-back tone service, and the selection module determines that the opposite-side user customizes the ring-back tone service has a high priority, the user of the local side is not executed. Customizing the operation of the ring back tone service, obtaining the address information of the media stream output media resource function module of the customized ring back tone service, and instructing the media resource function module to pass the media stream of the customized ring back tone service received from the predetermined address The address information is sent to the calling user;

a ninth execution sub-module, configured to: when the opposite-side network node adopts a gateway mode to provide a customized ring-back tone service, and the selection module determines that the user-defined ring-back tone service has a high priority, the media resource function module is discarded. a media stream of the customized ring back tone service received from the predetermined address; a tenth execution submodule, configured to provide a customized ring back tone service in the application server mode on the opposite side network node, and the selection module determines the opposite user to customize the ring back tone If the service priority is high, the operation of providing the user's customized ring back tone service is not performed, and the forwarding is performed by the peer network node.

Response information of the INVITE message;

The eleventh execution sub-module is configured to: when the opposite-side network node adopts the application server mode to provide a customized ring-back tone service, and the selection module determines that the user-side customized ring-back tone service has a high priority, send the packet to the opposite-side network node. The information of the ringback tone service media stream is refused to be instructed to indicate that the peer network node does not send the media stream of the customized ringback tone service.

The device of claim 28, wherein the execution module further comprises: an address acquisition submodule, configured to receive an INVITE message at the device, and determine that the calling user terminal does not support the application server mode The predetermined address information is obtained from the media resource function module and provided to the eighth execution submodule or the ninth execution submodule.