WO2009124512A1

WO2009124512A1 - Implement method for controlling playback of early media

Info

Publication number: WO2009124512A1
Application number: PCT/CN2009/071229
Authority: WO
Inventors: 谢振华
Original assignee: 中兴通讯股份有限公司
Priority date: 2008-04-11
Filing date: 2009-04-10
Publication date: 2009-10-15
Also published as: CN101448203B; CN101448203A

Abstract

An implement method for controlling playback of early media is disclosed by the present invention in which: a function entity for controlling sending of early media, after receiving an early media indicating message which carries an early media identifier but does not carry media resource information, controls media process device to continue or to stop sending early media information in session which the early media indicating message belongs to based on the early media identifier. Compared to the prior art, the method of the present invention involves the following advantages: when the function entity for controlling sending of early media is notified to forbid sending color ringback media, only the early media information is forbidden so that normal media and sessions may not be influenced; when an user responds, the talking between a calling party and a called party can be realized without interacting media data by re-negotiation.

Description

Method for controlling early media playback

Technical field

The present invention relates to the field of communications, and more particularly to a method for controlling a multimedia information playing service, also referred to as an early media service, in a call setup process in an IP multimedia subsystem without a session being answered. Background technique

IP (Internet Protocol, Network Interconnection Protocol) Multimedia Subsystem (IMS) is an IP-based network architecture proposed by the 3rd Generation Partnership Project (3GPP). An open and flexible business environment that supports multimedia applications and provides users with rich multimedia services.

In the IMS service system, the control layer and the service layer are separated. The control layer does not provide specific services, and only provides the necessary triggering, routing, and accounting functions to the service layer. The service triggering and control functions in the control layer are completed by the Call Session Control Function (CSCF). The CSCF is divided into Proxy-Call Session Control Function (P-CSCF) and query call session. There are three types of control functions: Interrogating Call Session Control Function (I-CSCF) and Serving Call Session Control Function (S-CSCF). The main responsibility is S-CSCF, and I-CSCF is Optional. The service layer is composed of a series of application servers (ASs), which are used to provide specific service services. The ASs can be independent entities or exist in the S-CSCF. The S-CSCF of the control layer controls the service trigger according to the subscription information of the user, invokes the service on the AS, and implements the service function. The end-to-end device in the session is called User Equipment (UE) and is responsible for interaction with the user. These functional entities communicate using the Session Initiation Protocol (SIP) protocol. In the service that needs to play multimedia information, the multimedia resource function (MRF) is also called the participation of the media server. It is divided into the control part MRFC (Multimedia Resource Function Controller) and media processing. Part of MRFP (Multimedia Resource Function Processor, a multimedia resource function processor), wherein the control part MRFC is responsible for translating and interpreting the SIP signaling of the AS as an instruction to the MRFP, or vice versa, translating and interpreting the response signaling of the MRFP to be sent to the SE (Serving Equipment) SIP signaling; and the processing part of the MRFC is responsible for the transmission and reception of the media stream. There is also a media playback device, called a media gateway (MG). The MG is mainly responsible for transmitting media information in a traditional network (non-IMS network) to the IMS network. Similar to the MRF, the MG is also divided into a control part MGCF. And media processing part MGW.

The early media service allows the network to play multimedia information to the calling user or the called user in the case that the called party has not answered the call. The service played to the calling user is also called the CRBT service, and the service is played to the called user. Also known as the color image business.

Since the MRFC is likely to be physically an entity with the AS, in order to simplify the process representation, only the AS entity is given in the legend.

FIG. 1 is a basic message flow diagram of a conventional one-number service causing a colorful bell, and describes a process in which an IMS calling party UE-A calls an IMS called UE-B, and the called UE-B opens a one-number service. The UE-B and the legacy terminal C are required to be called at the same time, and both the called UE-B and the legacy terminal C are enabled with the CRBT service. In the case that both the UE-B and the legacy terminal C have not answered yet, the CR-Ren service device of the UE-B Both the AS-B and the media gateway MG-C of the legacy terminal C play the CRBT media to the calling UE-A, and the UE-A requests the MG-C to prohibit the process of playing the CRBT media. The one-number service is composed of the called S-CSCF. (ie S-CSCF-B) is executed, the steps are as follows:

In the step 101, the UE-A initiates a call request to the UE-B through the S-CSCF-B, for example, sends an INVITE message, and the message carries the normal media resource information of the UE-A, for example, carried in the message body, including the media type. , media port number and address information, and can inform the network UE-A to support early media, such as carrying the P-Early-Media field, the value is supported;

Step 102, the UE-B is activated by the CRBT service, and after receiving the INVITE message, the S-CSCF-B forwards the message to the CRBT service device AS-B of the UE-B according to the Initial Filter Criteria (iFC).

Steps 103 to 104, the AS-B forwards the call request to the UE-B via the S-CSCF-B; Steps 105 to 106, UE-B receives a call request, and responds to a temporary response message, such as a "183 Session Progress" message, and the message is sent to the color ring tone AS-B via the S-CSCF-B;

Steps 107 to 108, the CRBT AS-B forwards the temporary response message to the UE-A via the S-CSCF-B. Steps 109-110, the CRBT AS-B performs the CRBT service, allocates the CRBT media resource, and then uses the standard branch response technology. Sending a temporary response message to the UE-A, such as a "183 Session Progress" message, carrying the color ring media resource information, for example, carried in the message body, including media type, media port number and address, etc., and carrying the color ring media identifier to inform The calling media resource information is the color ring media resource information, for example, the P-Early-Media field carries a non-supported value, and the message is sent to the UE-A via the S-CSCF-B;

The step 109 has no relationship with the step 103, and can be executed at the same time.

Step 111: The AS-B plays the CRBT media information to the UE-A.

This step has no relationship with step no and must be executed after step 109.

Step 112: The S-CSCF-B performs the one-number service, and then initiates a call request to the traditional terminal C by using a standard branching technology, for example, sending an INVITE message, and carrying the obtained normal media resource information of the UE-A;

This step 112 has no relationship with step 102 and can be performed simultaneously.

Step 113: The MG-C includes the MGCF and the MGW. After receiving the call message, the traditional circuit C in the traditional network is called by the circuit switching standard process, and the traditional terminal C activates the CRBT service in the traditional network. The service service device decides to play the CRBT media information to the UE-A;

Step 114: The MG-C responds to the temporary response message, for example, responding to "183 Session Progress", because the color ring media information needs to be sent to the calling party, and the MG-C sends a temporary response message to the calling party via the S-CSCF-B, in the temporary The response message carries the media resource information, for example, carried in the message body, including the media type, the media port number, and the address, and may carry the CRBT media identifier to notify the calling media resource information as the CRBT media resource information, for example, P-Early - the Media field carries a non-"supported" value representation;

Step 115, the S-CSCF-B forwards the temporary response message to the UE-A;

Step 116: The MG-C plays the CRBT media information to the calling UE-A. This step 116 has no relationship with step 115, but must be performed after step 114. Steps 117 ~ 118, UE-A wants to stop the color ring media playing of the traditional terminal C, and then requires the traditional network of the traditional terminal C to prohibit sending media, such as sending an UPDATE (update) message or a PRACK (pre-acknowledgment) message, carrying the UE-A The media resource information is carried in the message body, for example, the attribute of each media type is set to not allow the other party to send, for example, setting the attribute line a of each media type to sendonly (send only) or inactive (deactivate), the message is S- CSCF-B arrives at MG-C; Steps 119 ~ 120, MG-C receives early media indication message, stops sending media information, and agrees to prohibit sending media, such as responding to "200 OK" message, carrying MG-C media resources The information, for example, is carried in the message body, where the attributes of each media type are set to not allow transmission, for example, setting a row value of each media type to recvonly (receive only) or inactive, and the message arrives at UE-A via S-CSCF-B. ;

Step 121: The traditional terminal C answers the call, and the traditional network of the traditional terminal C stops the playing of the color ringing medium;

Steps 122 to 123, the MG-C receives the response signaling of the legacy terminal C, and sends a response message to the UE-A, for example, sending a "200 OK" message. Since the normal media and the ring back tone media use the same media resource, the message is not Carrying the media resource information, the response message is sent to the UE-A via the S-CSCF-B; Steps 124-125, the UE-A receives the response message, and requires the legacy network of the legacy terminal C to allow the transmission of the media, for example, sending relNVITE (re-invitation) The message carries the media resource information of the UE-A, for example, is carried in the message body, where the attributes of each media type are set to allow the other party to send, for example, setting the attribute line a of each media type to sendrecv (send and receive) or recvonly, the message is S-CSCF-B arrives at MG-C;

Steps 126 ~ 127, after receiving the re-invitation message, the MG-C agrees to send the media, for example, responding to the "200 OK" message, carrying the media resource information of the MG-C, for example, carrying in the message body, wherein the attributes of each media type Set to allow transmission, for example, set the a row value of each media type to sendrecv or sendonly, and send the message to UE-A via S-CSCF-B;

Step 128: The UE-A and the legacy terminal C implement the call through the media transfer of the MG-C, and the session between the UE-A and the UE-B is terminated by the S-CSCF-B according to a standard procedure. The disadvantages of the prior art are: when the function entity that controls the early media transmission is prohibited from transmitting the color ring tone media, all media including the color ring tone and the normal media are prohibited, thereby affecting the session; and, after the user answers, there is It may be irrational to require renegotiation to allow interaction of media data to enable the call of the calling and called parties.

Summary of the invention

The technical problem to be solved by the present invention is to provide an implementation method for controlling early media playback. After the user answers, the call can be realized without renegotiating the media data.

In order to solve the above problem, the present invention provides an implementation method for controlling early media playback. After receiving an early media indication message that does not carry media resource information and carries an early media identifier, the functional entity that controls early media transmission is The early media identification control media processing device continues or stops transmitting the early media information in the session to which the early media indication message belongs.

Further, the early media indication message is sent by the calling user or the application server.

UPDATE message or PRACK message.

Further, the early media identifier is carried by a P-Early-Media field in the message body, and the value of the P-Early-Media field is not "supported".

Further, when the P-Early-Media field value is sendonly or inactive, it means that the sending of the early media information is prohibited; and when the P-Early-Media field value is sendrecv or recvonly, it is allowed to continue to send the early media information.

Further, if the function entity that controls the early media transmission supports the early media identifier, after receiving the early media indication message that the P-Early-Media field value is sendonly or inactive, the device returns to agree to prohibit sending the early media information. The response message, and the early media identifier carrying the P-Early-Media field value as recvonly or inactive in the response message;

After receiving the early media indication message of the P-Early-Media field value of sendrecv or recvonly, returning a response message agreeing to allow the transmission of the early media information, and carrying in the response message

Further, if the function entity that controls the early media transmission does not support the early media identifier, the function entity that supports the early media identifier and controls the early media transmission according to the response of the early media indication message Whether the information carries the early media identifier determines whether the media processing device is controlled to continue or stop transmitting the early media information.

Further, the function entity supporting the early media identification in the path through which the early media indication message passes indicates that the function entity sent by the early media determines whether to control the media processing device to continue or stop transmitting the early media information according to the early media indication message.

Further, the function entity that controls the early media transmission is an application server, or a media gateway control function, or a proxy call session control function;

The media processing device is a multimedia resource function processor, or a media gateway, or a media processing device of an IP bearer network.

Compared with the prior art, the implementation method for controlling early media playback of the present invention has the following advantages: When the function entity that controls the early media transmission is prohibited from transmitting the color ring tone media, only the early media information is prohibited, so that the normal media and The session has an impact; when the user answers, the call of the calling party and the called party can be realized without re-negotiating the interaction of the media data.

BRIEF abstract

1 is a basic message flow chart of a colorful bell caused by a one-number service in the prior art;

2 is a basic message flow chart of an embodiment of the present invention;

3 is a basic message flow chart of another embodiment of the present invention;

4 is a basic message flow diagram of still another embodiment of the present invention.

Preferred embodiment of the invention

The main idea of the present invention is: when it is required to control the playing of the early media, the functional entity corresponding to the control of the early media transmission is prohibited from transmitting the early media, instead of prohibiting all the media including the early media and the normal media, thereby avoiding the existing A drawback in the technology, that is, after the user answers, it is also necessary to re-negotiate the media that is allowed to be used for the media data necessary for the call.

Specifically, taking the ring back tone media in the early media service as an example, the present invention controls the early media playback. Implementation methods include:

When the calling user or the CRBT AS needs to control the function of the early media transmission (such as CRBT AS, MGCF or P-CSCF) to stop playing the CRBT media, send an UPDATE (update) or PRACK (pre-acknowledgement) message to control the early media transmission. The function entity, the message does not carry any media resource information, and carries the early media identifier, such as carrying the P-Early-Media field, the value is sendonly or inactive, requesting to stop sending the early media, and the functional entity controlling the early media sending receives the UPDATE After the PRACK message, the media processing device, such as the media processing device that controls the MRFP, the MGW, or the IP bearer network, stops sending the early media information;

When the calling user or the CRBT AS or the P-CSCF needs to control the function entity that controls the early media transmission to resume playing the CRBT media, the UPDATE or PRACK message is sent to the functional entity that controls the early media transmission, without any media resource information. And carrying the early media identifier, for example, carrying the P-Early-Media field, the value is sendrecv or recvonly, requesting to continue to send the early media, and the functional entity controlling the early media transmission receives the UPDATE or PRACK message, and then controls the MRFP, the MGW, or the IP bearer. Media processing devices such as media processing devices of the network continue to transmit early media information.

The implementation method of the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. Embodiment 1

2 is a basic message flow diagram of a multi-number service causing a colorful bell according to the present invention, and describes a process in which an IMS calling UE-A calls an IMS called UE-B, and the called UE-B opens a one-number service. It is required to simultaneously call the UE-B and the legacy terminal C, and both the called UE-B and the legacy terminal C have the CRBT service enabled. If both the UE-B and the legacy terminal C have not answered yet, the UE-B CRBT service device AS- B and the MG-C of the legacy terminal C both play the ring back tone media to the calling UE-A, and the UE-A separately requests the CRBT AS-B and the MG-C to prohibit the process of playing the CRBT media, wherein the one-number service is called by the called S -CSCF (ie S-CSCF-B) is executed. To simplify the process, the P-CSCF is omitted from the figure. As shown in Figure 2, the steps are as follows:

Steps 201 to 216 are the same as steps 101 to 116 in FIG. 1;

Steps 217 - 218, UE-A wants to stop the color ring media playing of the traditional terminal C, and then sends the early media indication message to request the traditional network of the traditional terminal c to prohibit sending the early media, such as sending An UPDATE message or a PRACK message, without any media resource information, and carrying an early media identifier, such as carrying a P-Early-Media field, the value is sendonly or inactive, and the message is sent to the MG-C via the S-CSCF-B;

Steps 219 ~ 220, after receiving the above message, the MG-C stops sending the early media information, and agrees to prohibit the sending of the early media, for example, responding to the "200 OK" message, without any media resource information, and carrying in the response message The early media identifier, for example, carrying the P-Early-Media field, the value is recvonly or inactive, and the message is sent to the UE-A via the S-CSCF-B;

Steps 221 ~ 222, if the UE-A also stops the CR-Rell media playback of the UE-B, the B-party is prohibited from sending the early media, for example, sending an UPDATE message or a PRACK message without any media resource information, and carrying the early media identifier. For example, carrying the P-Early-Media field, the value is sendonly or inactive, and the message is sent to the ring back tone AS-B via the S-CSCF-B;

Steps 223 ~ 224, the AS-B receives the early media indication message, instructing the media playback device to stop sending the early media information, and agrees to prohibit the sending of the early media, for example, responding to the "200 OK" message, without any media resource information, portable The early media identifier, for example, carrying the P-Early-Media field, the value is recvonly or inactive, and the message is sent to the UE-A via the S-CSCF-B;

Step 225, the traditional terminal C answers the call, and the traditional network of the traditional terminal C stops the playback of the color ring media;

Steps 226 to 227, the MG-C receives the response signaling of the legacy terminal C, and sends a response message to the UE-A, for example, sending a "200 OK" message. Since the normal media and the ring back tone media use the same media resource, the message is not Carrying the media resource information, the response message is sent to the UE-A via the S-CSCF-B; Step 228, between the UE-A and the legacy terminal C, the call is implemented by the media transfer of the MG-C, and between the UE-A and the UE-B The session is terminated by the S-CSCF-B using standard procedures.

Step 217 220 embodies the control of the MG/MGCF as a functional entity for controlling early media transmission for early media playback, and steps 221 to 224 exemplify the control of the AS as a functional entity for controlling early media transmission.

Embodiment 2

3 is a basic message flow chart of providing a unique ring back tone for the one-number service of the present invention, describing the IMS In the process of the calling UE-A calling the traditional terminal B, the traditional terminal B opens the one-number service in the IMS network and provides the one-number ring tones, requiring simultaneous calling of the traditional terminal B and the traditional terminal C, while the traditional terminal C is traditional. When the CRBT service is enabled in the network, and the traditional terminal B and the legacy terminal C have not yet answered, the one-way service service device AS prohibits the MG-C from playing the ring back tone media to the calling UE-A, and plays the number one for the UE-A. Through the process of color ring tone media, the one-number service is performed by the called AS. To simplify the process representation, the one-number ring tone service is also performed by the AS, and the P-CSCF is omitted in the figure. As shown in Figure 3, the steps are as follows:

Steps 301-302, UE-A calls the traditional terminal B, for example, sends an INVITE message, where the message carries the normal media resource information of the UE-A, for example, carried in the message body, including the media type, the media port number, and the address, and The network UE-A can be informed that the early media is supported, for example, the P-Early-Media field is carried, and the value is supported, and the message is routed to the one-way AS through the S-CSCF;

Steps 303 ~ 304, the number of the AS forwards the call request to the legacy terminal B, and the message is sent to the MG-B via the S-CSCF;

Step 305, the MG-B calls the traditional terminal B in the traditional network by using the circuit switching standard procedure; Steps 306 ~ 307, the MG-B responds to the temporary response message, such as the "183 Session Progress" message, and the message is sent to the S-CSCF. No. AS;

Steps 308 ~ 309, the number-pass AS forwards the temporary response message to the UE-A via the S-CSCF; Steps 310-311, the number-pass AS performs the one-number service, and then initiates a call to the legacy terminal C by using the standard branch technology. The request, for example, sending an INVITE message, carrying the obtained normal media resource information of the UE-A, and the message is sent to the MG-C via the S-CSCF;

This step has no relationship with step 303 and can be performed simultaneously.

Step 312: The MG-C uses the circuit switching standard process to call the traditional terminal C in the traditional network, and the traditional terminal C activates the CRBT service in the traditional network, so the CRBT service device of the traditional network plays the CRBT media information to the calling party;

Steps 313 ~ 314, the MG-C responds with a temporary response message, such as a response "183 Session

Progress", because the color ring media information needs to be sent to the calling party, the MG-C carries the media resource information in the temporary response message, for example, carried in the message body, including the media type, the media port number and the address, etc., and can carry the color ring media. The identifier is used to inform the calling media resource information that the color ring media resource information is For example, the P-Early-Media field carries a non-supported value, and the message is sent to the one-way AS through the S-CSCF;

Steps 315 - 316, the number-pass AS needs to provide unique ring back tone media information, to stop the early media play of the legacy terminal C, and then send the early media indication message to request the traditional network of the legacy terminal C to prohibit sending the early media, such as sending an UPDATE message or a PRACK message, without any media resource information, and carrying an early media identifier, such as carrying a P-Early-Media field, the value is sendonly or inactive, and the message is sent to the MG-C via the S-CSCF;

Steps 317 ~ 318, the MG-C receives the early media indication message, stops sending the early media information, and agrees to prohibit the sending of the early media, for example, responding to the "200 OK" message, without any media resource information, may carry the early media identifier. For example, the P-Early-Media field is carried in the response message, and the value is recvonly or inactive, and the message is sent to the No. 1 AS through the S-CSCF;

The value of the P-Early-Media field carried in the response message is set corresponding to the sendonly or inactive in the UPDATE message or the PRACK; if the early media indication message received by the MG-C is allowed to continue to send the early media, If the value in the UPDATE message or PRACK is sendrecv or recvonly, the P-Early-Media field may be carried in the response message, and the value is sendrecv or sendonly.

Steps 319-320, the number-pass AS deletes the early media identifier of the temporary response message received in step 314, and then forwards the message to the UE-A via the S-CSCF;

Steps 321 ~ 322, the number-pass AS performs the CRBT service, allocates the CRBT media resource, and then sends a temporary response message to the UE-A by using a standard branch response technology, such as a "183 Session Progress" message, carrying the number one pass ringtone media resource information. For example, it is carried in the message body, including media type, media port number and address, and may carry an early media identifier to inform the calling media resource information as early media resource information, for example, carrying a P-Early-Media field. The supported" value indicates that the message is sent to the UE-A via the S-CSCF;

Step 323, the number communication AS plays the color ring tone media information to the UE-A;

This step has no relationship with step 322 and must be performed after step 321 .

Step 324, the traditional terminal C answers the call, and the traditional network of the traditional terminal C stops. Playback of color ring media;

Steps 325 ~ 326, the MG-C receives the response signaling of the legacy terminal C, and sends a response message to the UE-A, for example, sending a "200 OK" message. Since the normal media and the ring back tone media use the same media resource, the message is not Carrying the media resource information, the response message reaches the one-way AS through the S-CSCF; Step 327, the number-pass AS stops playing the first-number ringtone media information;

Steps 328 ~ 329, the first-number AS forwards the response message to the UE-A, and the message passes through the S-CSCF. In step 330, the UE-A and the legacy terminal C implement the call through the medium transfer of the MG-C, UE-A and the traditional The session between terminals B is terminated by the one-way AS using standard procedures.

This embodiment embodies the control of the MG as a function entity for controlling the transmission of the early media. The MG is controlled according to the prohibition of sending the early media message sent by the AS. However, in other embodiments of the present invention, the MG may also be based on the UE- The indication message sent by A to prohibit or continue to send early media enables control of early media playback.

Embodiment 3

FIG. 4 is a basic message flow diagram of a multi-number service causing a colorful bell according to the present invention, and describes a process in which an IMS calling UE-A calls a legacy terminal B, and the traditional terminal B opens a one-number service in the IMS network. At the same time, the traditional terminal B and the traditional terminal C are called, and the traditional terminal B and C both open the CRBT service in the traditional network. When both the traditional terminal B and the legacy terminal C have not yet responded, both the traditional network B and the legacy network C are directed to the UE. -A plays CRBT media information, UE-A requires MG-C to prohibit the process of playing CRBT media. The one-number service can be executed by S-CSCF. The steps are as follows:

Steps 401-402, UE-A calls the traditional terminal B, for example, sends an INVITE message, where the message carries the normal media resource information of the UE-A, for example, carried in the message body, including the media type, the media port number, and the address, and The network UE-A can be informed that the early media is supported, for example, carrying the P-Early-Media field, the value is supported, and the message is sent to the S-CSCF via the P-CSCF;

Step 403, the S-CSCF forwards the call request to the legacy terminal B;

Step 404: The call message passes through the MG-B, and the MG-B uses the circuit switching standard process to call the traditional terminal B in the traditional network, and the traditional terminal B opens the CRBT service in the traditional network, so the traditional The CRBT service device of the network plays the CRBT media information to the calling party;

Step 405: The MG-B responds to the temporary response message, for example, responding to "183 Session Progress", because the color ring media information needs to be sent to the calling party, and the MG-B carries the media resource information in the temporary response message, for example, carried in the message body. The media type, the media port number, and the address are included, and the color ring media identifier can be carried to notify the calling media resource information to be the color ring media resource information, for example, the P-Early-Media field carries a non-supported value;

Step 406 407, the temporary response message is sent to the UE-A via the S-CSCF, and the S-CSCF forwards the temporary response message to the UE-A via the P-CSCF;

Step 408: The MG-B sends the CRBT media information to the calling UE-A.

This step has no relationship with step 407, but must be performed after step 406.

Step 409: The S-CSCF performs a one-number service, and then initiates a call request to the traditional terminal C by using a standard branching technology, for example, sending an INVITE message, and carrying the obtained normal media resource information of the UE-A;

This step has no relationship with step 403 and can be performed simultaneously.

Step 410: The call message passes through the MG-C, and the MG-C uses the circuit switching standard process to call the traditional terminal C in the traditional network, and the traditional terminal C activates the CRBT service in the traditional network, so the CRBT service device of the traditional network is directed to the main Calling the party to play the ringtone media information;

Step 411: The MG-C responds to the temporary response message, for example, responding to "183 Session Progress", because the color ring media information needs to be sent to the calling party, and the MG-C carries the media resource information in the temporary response message, for example, carried in the message body. The media type, the media port number, and the address are included, and the color ring media identifier can be carried to notify the calling media resource information to be the color ring media resource information, for example,

The P-Early-Media field carries a non-supported value representation;

Steps 412 ~ 413, the temporary response message is sent to the UE-A via the S-CSCF, and the S-CSCF forwards the temporary response message to the UE-A via the P-CSCF;

Step 414: The MG-C sends the ring back tone media information to the calling UE-A.

This step has no relationship with step 413 and must be executed after step 412.

Steps 415 - 417, UE-A wants to stop the color ring media playing of the traditional terminal C, and then sends the early media indication message to request the traditional network of the traditional terminal c to prohibit sending the early media, such as sending UPDATE (update) message or PRACK (pre-acknowledgment) message, without any media resource information, and carrying an early media identifier, such as carrying a P-Early-Media field, value is sendonly or inactive, message via P-CSCF and S-CSCF Send to MG-C;

Steps 418 ~ 420, the MG-C receives the early media indication message, but the MG-C is the old device, does not support the P-Early-Media field, and then ignores the message, still does not stop sending the early media data, and sends the response according to the standard. The message, for example, responds to the "200 OK" message, does not carry any media resource information, and the message arrives at the UE-A via the S-CSCF and the P-CSCF;

Step 421: The P-CSCF can identify the message in step 415, and can directly decide to perform the media control function, or control whether the media processing device located in the IP bearer network does not forward the MG according to whether the response message in step 419 carries the early media identifier. The early media information sent by the C to the UE-A, wherein the process in which the P-CSCF controls the bearer network media processing device to stop sending the media is a standard process;

Steps 422 ~ 424, the user wants to hear the CRBT of the traditional terminal C. At this time, the UE-A wants to continue the CRBT media playback of the legacy terminal C, so that the traditional network of the legacy terminal C is required to allow the early media to be sent, for example, sending an UPDATE (update) Message or PRACK (pre-acknowledgment) message, without any media resource information, and carrying an early media identifier, such as carrying a P-Early-Media field with a value of sendrecv or recvonly, the message is sent to the MG via the P-CSCF and the S-CSCF -C;

Steps 425 ~ 427, the MG-C receives the early media indication message, but the MG-C is the old device, does not support the message, and then ignores the message, still does not stop sending the early media data, and sends the response message according to the standard, such as responding "200 OK" message, does not carry any media resource information, the message is sent to the UE-A via the P-CSCF and the S-CSCF;

Step 428, the P-CSCF can identify the message of step 422, and decide to perform the media control function, and continue to forward the early media information sent by the MG-C to the UE-A;

Step 429, the traditional terminal C answers the call, and the traditional network of the traditional terminal C stops the playing of the color ringing medium;

Steps 430 ~ 431, the MG-C receives the response signaling of the legacy terminal C, and sends a response message to

UE-A, for example, sends a "200 OK" message. Since the normal media and the ringback media use the same media resource, the message does not carry the media resource information, and the response message is sent to the P-CSCF via the S-CSCF; Step 432, P- The CSCF receives the response message, performs the media control function, and forwards the MG-C to send Media information for UE-A and media information sent by UE-A to MG-C;

Step 433: The UE-A and the legacy terminal C implement the call through the media transfer of the MG-C, and the session between the UE-A and the legacy terminal B is terminated by the S-CSCF using a standard procedure.

This embodiment embodies the P-CSCF as a functional entity for controlling early media transmission to implement control of early media playback.

It is a matter of course that the invention may be embodied in various other forms and modifications without departing from the spirit and scope of the invention. For example, the method of the present invention can also be applied to the control of early media playback in a non-one-number service, and the method of the present invention is equally applicable to the color picture service in the early media service.

Claims

Claim

1. An implementation method for controlling early media playback, wherein

After receiving the early media indication message that does not carry the media resource information and carries the early media identifier, the function entity that controls the early media transmission controls the media processing device to continue or stop sending the early media indication message according to the early media identifier. Early media information in the conversation.

2. The implementation method according to claim 1, wherein

The early media indication message is an UPDATE message or a PRACK message sent by the calling user or the application server.

3. The implementation method according to claim 1 or 2, wherein

The early media identifier is carried by a P-Early-Media field in the message body, and the

The value of the P-Early-Media field is not "supported".

4. The implementation method according to claim 3, wherein

When the P-Early-Media field value is sendonly or inactive, it means that the transmission of the early media information is prohibited; when the P-Early-Media field value is sendrecv or recvonly, it is allowed to continue to send the early media information.

5. The method according to claim 4, wherein

The functional entity that controls early media transmission, if supporting early media identification,

After receiving the early media indication message that the P-Early-Media field value is sendonly or inactive, returning a response message agreeing to prohibit the transmission of the early media information, and carrying the P-Early-Media field value in the response message is recvonly Or inactive early media identification;

After receiving the early media indication message of the P-Early-Media field value of sendrecv or recvonly, returning a response message agreeing to allow the transmission of the early media information, and carrying the P- in the response message.

6. The implementation method according to claim 4, wherein

Supporting early media if the functional entity controlling the early media transmission does not support early media identification The function entity of the identified early media transmission determines whether to control the media processing device to continue or stop transmitting the early media information according to whether the response message of the early media indication message carries the early media identifier.

7. The implementation method according to claim 5, wherein

The function entity supporting the early media identification in the path through which the early media indication message passes is determined by the early media indication message whether to control the media processing device to continue or stop transmitting the early media information.

8. The implementation method according to claim 5, wherein

The function entity for controlling early media transmission is an application server, or a media gateway control function, or a proxy call session control function;