CN101448346B - A method for copying early media information - Google Patents

Abstract

The invention discloses a method for copying early-media information. The method comprises the steps as follows: user equipment sends an early-media copying request to a first service serving device AS by a protocol independent of media connection; the request carries at least one of a copy operation instruction and early-media identification information; and the first service serving device received the early-media copying request, loads the content of early-media from a second service serving device and associates the content of the early-media as the early-media of the user equipment. The method sends the early-media copying request by the protocol independent of the media connection, thereby not requiring establishing bidirectional media connection, eliminating unsafe factors and improving reliability. In addition, the method can use a plurality of service serving devices to realize the early-media copying operation, and a calling party and a called party can be located in different operation networks, thereby overcoming the disadvantage in prior art that the calling party and the called party are required to be located in the same operation network and increasing flexibility.

Description

A method for copying early media information

technical field

The present invention relates to the communication field, more specifically, relates to the service of playing multimedia information to the calling party or the called party during the call establishment process in the IP multimedia subsystem, and a realization method for copying the early media information.

Background technique

IP (Internet Protocol, Internet Protocol) multimedia subsystem (IP Multimedia CoreNetwork Subsystem, referred to as IMS) is an IP-based network architecture proposed by the 3rd Generation Partnership Project (3GPP for short), which builds a The open and flexible service environment supports multimedia applications and can provide users with rich multimedia services.

In the IMS service system, the control layer and the service layer are separated, and the control layer does not provide specific services, but only provides necessary functions such as triggering, routing, and charging to the service layer. The service triggering and control functions in the control layer are completed by the call session control function (Call Session Control Function, referred to as CSCF). CSCF is divided into proxy Proxy (P-CSCF, Proxy Call Session Control Call Session Control Function) and Serving Serving (S-CSCF, Serving Call Session Control Function), among which the main responsibility is Serving, and the Interrogating type is optional. The business layer is composed of a series of application servers (Application Server, referred to as AS), which can provide specific business services. The control layer (S-CSCF) controls service triggering according to the user's subscription information, invokes services on the AS, and realizes service functions. The end-to-end device in the session is called UE (User Equipment), which is responsible for the interaction with the user. These functional entities communicate using the SIP (Session Initiation Protocol, Session Initiation Protocol) protocol, and the user equipment establishes a media connection for transmitting media data through SIP signaling interaction. In order to effectively control media data, the IMS network connects the user and the network through the media forwarding gateway. The media data sent by the user is forwarded through the media forwarding gateway, and the media data that the user wants to receive is also forwarded to the user through the media forwarding gateway. In the business that needs to play multimedia information, the participation of a multimedia resource function (Media Resource Function, MRF for short) is required. MRF is also called a media server, and it is divided into a control part MRFC (MRF Control) and a media processing part MRFP (MRF Process). The response is translated and interpreted as SIP signaling sent to SE, while the processing part is responsible for the sending and receiving of media streams. The border device between the IMS network and the traditional link switching network is called Media Gateway (MG for short). Similar to MRF, MG is divided into two parts: MGCF (MG Control Function) and MGW (Media GateWay). The one is the media processing part.

The SIP protocol can be used as the bearer layer of the Session Description Protocol (SDP, Session Description Protocol). The SDP is responsible for media resource information negotiation, including information such as media type, media connection address, media connection port, and bandwidth requirements. The content of the SDP protocol is divided into two types: request and response, and each request must have a response.

The service of playing multimedia information to the called party at the same time during the call establishment process is a service in IMS. This service can also be called the chromatic image service. Multimedia information, including audio, video, graphics and their combination, etc., and stop the playback of multimedia information that has not been stopped after the called party answers. The service of playing multimedia information to the caller at the same time during the call establishment process is another service in IMS. This service can also be called the ring back tone service. Multimedia information, and stop the playback of multimedia information that has not been stopped after the called party answers. All media data that occurs before the user responds is collectively referred to as early media.

Copying the CRBT media information means that when the calling user listens to the CRBT, he wants to use the CRBT as his own CRBT, so that when the user is called, he can play the copied CRBT information to the calling party; or he wants to use the CRBT as his own Color image, when the user is the calling party, the copied color image information can be played to the called party. The color image media information copy means that when the called user listens to the color image, he wishes to use the color image as his own color image or CRBT, which has the same meaning as the CRBT copy.

Figure 1 is the basic message flow chart of the existing CRBT copy, which describes that when the calling UE-A calls the called UE-B, the called party activates the CRBT service, so the called network plays the CRBT early media information to UE-A, The process that the called user wants to copy the ring back tone as his own ring tone, the steps are as follows:

Step 101: UE-A calls UE-B, such as sending an INVITE (invitation) message, which can carry UE-A's SDP request. Since the called UE-B has opened the CRBT service, the message passes through the CRBT service device AS, and finally arrive at UE-B;

Step 102: UE-B sends a provisional response message, such as sending a "183 Session Progress" message, which may carry the SDP response of the called UE-B, and the message passes through the CRBT service device AS;

Step 103: The CRBT service device AS calls the CRBT media server MRF, such as sending an INVITE message, the message body may carry the SDP request in step 101;

Step 104: The CRBT media server MRF answers the call, such as sending a "200 OK" message. If there is no SDP information in step 103, the CRBT SDP request is carried in the response message, otherwise the CRBT SDP response is carried, and the message reaches the CRBT service device AS;

Step 105: The CRBT service device AS sends a temporary response message to the calling party, such as sending a "183 Session Progress" message. If the CRBT SDP response is carried in step 104, the CRBT SDP response is carried in the message body of this message, otherwise The message body carries the color ring back tone SDP request in the early-session type, and the message reaches UE-A;

Step 106: UE-A, CRBT service device AS, CRBT media server MRF and UE-B execute subsequent media resource negotiation process according to the standard procedure, and finally complete the early media resource information negotiation between UE-A and CRBT media service device MRF;

Step 107: The CRBT service device AS instructs the MRF to play CRBT media information to the calling party, and UE-A plays the CRBT media information to the user;

Step 108: The calling user wishes to copy the CRBT information, so presses a key, and UE-A sends the key information to the MRF through the media connection;

Step 109: The MRF receives the button information, judges that the information is the button information for the copy operation, and then notifies the CRBT service device AS to associate the CRBT information with the calling user, for example, by sending an INFO message to notify the CRBT service device AS of related information.

The chromatic image service also adopts the same technology, so I won't repeat it here.

In the prior art, in order to realize early media copying, the calling party and the called party must belong to the same operator network, and the same CRBT/CRBT AS provides the CRBT/CRTV service. In addition, the CRBT/CRTV service often only allows one-way media transmission, which makes it impossible to send the button information in the opposite direction to the CRBT/CRTV media server through the media connection, so the existing technology requires that the CRBT/CRTV service must establish a two-way The media transmission increases the unsafe factor, for example, the caller and the called party may use such a two-way media connection to conduct a normal call without being billed.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for copying early media information. This method does not require the caller and the called party to be on the same operator network, and the process of sending the copy request does not need to establish a two-way media connection, thereby eliminating potential safety hazards. .

In order to solve the above problems, the present invention provides a method for copying early media information, comprising the following steps:

The user equipment sends an early media copy request to the first business service device AS through a protocol that does not depend on the media connection, and the request carries at least one of the copy operation instruction and the early media identification information;

The first business service device receives the early media copy request, downloads the early media content from the second business service device, and associates the early media content as the early media of the user equipment.

Further, the protocol not dependent on the media connection includes configuration access protocol XCAP or HTTP protocol.

Further, the copy operation instruction includes an instruction for copying the early media information as a ring tone or a color image; the early media identification information includes dialogue identification, media session identification, media session information, and early media business service device address one or any combination.

Further, the step of downloading the early media content from the second business service device by the first business service device includes:

The first business service device sends an early media download request to the second business service device, and the second business service device sends the identification information of the early media content to the first business service device;

The first business service device judges whether the early media content has been managed according to the identification information of the early media content, if not, the first business service device downloads the early media content from the second business service device ; If yes, go directly to the next step.

Further, the identification information of the early media content includes one or any combination of the file name, file number and file server address of the early media content.

Further, before the first business service device sends the early media download request to the second business service device, it further includes:

The first business service device sends an authentication request to the second business service device;

The second business service device authenticates the authentication request sent by the first business service device, and performs subsequent steps after the authentication is passed.

Further, before the user equipment sends the early media copy request to the first business service equipment, it also includes the steps of:

The calling user equipment sends a call request to the called user equipment through the first service service device and the second service service device;

The called user equipment sends a temporary response to the second business service device, and the second business service device sends the temporary response to the calling party after adding the identification information of the second business service device to the temporary response user equipment;

The calling user equipment, the first business service equipment, the second business service equipment and the called user equipment complete resource negotiation, and the business service equipment provides early media content for the calling user equipment or the called user equipment, and the The calling user equipment or called user equipment plays.

Further, the provisional response sent by the called user equipment is a Session Description Protocol SDP response.

Further, the method for the second business service device to add the identification information of the second business service device in the provisional response includes:

modifying the identification information of the called user equipment in the provisional response to the identification information of the second business service equipment;

Generate a new provisional response with a session identifier different from the provisional response, where the new provisional response carries the SDP response of the early media service; or

Add "early-session" content to the message body of the provisional response, and set this content as the SDP request of the early media service.

The present invention sends the early media copy request by using a protocol that does not depend on the media connection, so there is no need to establish a two-way media connection, which eliminates unsafe factors and improves reliability; in addition, the present invention can use multiple business service devices to realize early media copying. For media copy operation, the caller and called party can be located in different operator networks, which overcomes the disadvantage that the caller and called party must be located in the same operator network in the prior art, and increases flexibility.

Description of drawings

Fig. 1 is the basic message flowchart of the color ring copy in the prior art;

Fig. 2 is the basic message flow diagram of a color ring copy embodiment of the present invention;

Fig. 3 is a basic message flow chart of another embodiment of copying CRBT in the present invention;

Fig. 4 is the basic message flowchart of a chromatic image copy embodiment of the present invention;

Fig. 5 is a basic message flow chart of another color image copy embodiment of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

In the accompanying drawings (Fig. 2-Fig. 5) of the present invention, in order to simplify the process description, the color ring service service equipment AS2 and MRF are drawn as an entity, and the color video service equipment AS2 and MRF are drawn as an entity, they The standard SIP protocol process interaction is adopted between them.

As shown in Figure 2, it is a basic message flow chart of a color ring copy embodiment of the present invention, which describes that when the calling user equipment UE-A calls the called user equipment UE-B, the called party activates the color ring service, and the called user equipment UE-A calls the called user equipment UE-B. Call the network to play the CRBT early media information to UE-A, and the calling user wants to copy the CRBT as his own CRBT or color image, the steps are as follows:

Step 201: UE-A calls UE-B, such as sending an INVITE (invite) message, which may carry UE-A's SDP request, and the message is routed to the first business service device AS1 and the second business service device (called in this embodiment CRBT media service device) AS2, finally arrives at UE-B;

Step 202: UE-B sends a provisional response message to the calling party, such as sending a "183 SessionProgress" message starting with "1", and the response message passes through the CRBT service device AS2;

Step 203: The CRBT service device AS2 obtains the SDP information of the CRBT service from the MRF through a standard procedure, and then modifies the owner address in the SDP information to the address of the CRBT service device AS2: for example, modify the "o" line in the SDP information address content, then add the modified SDP information of the CRBT service in the message body and forward it to the calling party; or, if the received provisional response message contains the SDP response of UE-B, modify it to CRBT After the SDP response of the service is forwarded; or, both the temporary response message is forwarded and a new temporary response message is generated with a session identifier different from the temporary response message, and the SDP response of the ring back tone service is carried and sent to the calling party; or, after receiving The content of "early-session" is added to the message body of the provisional response message, and this content is set as the SDP request of the ring back tone service. The message passes through the business service device AS1, and is forwarded to UE-A by AS1; in this step, the response is sent The way is the standard process;

Step 204: UE-A, the first service service device AS1, the CRBT service device AS2 and UE-B execute the subsequent media resource negotiation process according to the standard procedure, and finally complete the early media resource information negotiation between UE-A and MRF;

Step 205: The CRBT service device AS2 instructs the MRF to play CRBT media information to the calling party, and UE-A plays the CRBT media information to the user;

Step 206: The user wants to copy the CRBT as his own CRBT or CRTV, so he sends a copy request to the first business service device AS1 through the user equipment UE-A, for example, through the configuration access protocol (XCAP) to the first business service device AS1 sends an HTTP request, which carries early media identification information, and may also carry a copy service instruction, such as whether you want to copy it as a ring tone or a color image; the early media identification information is one or more of dialogue identification, media session information, and media session identification. random combination;

Step 207: The first business service device AS1 receives the copy request. Since AS1 is in the dialog signaling path, it can indirectly know the address information of the CRBT service device AS2 according to the early media identification information, and sends the copy request to the CRBT service device AS2. A copy request, such as forwarding an HTTP request to the CRBT service device AS2 through the configuration access protocol (XCAP), the copy request sent may not carry a copy service instruction, and before sending the request, the first service service device AS1 may need to pass the XCAP protocol first to the The CRBT service device AS2 requests authentication and authorization, and forwards the request after obtaining the permission of the CRBT service device AS2;

Step 208: The CRBT service device AS2 finds the early media content information according to the early media identification information, and sends the content information to the first business service device AS1;

Step 209: After the morning media content is downloaded, the early media business service device AS2 sends a download success message to the first business service device AS1, such as sending a "200 OK" message of the HTTP protocol;

Step 210: The first business service device AS1 associates the downloaded early media content as UE-A's CRBT or CRTV content according to the service instruction in the early media copy request sent by UE-A;

Step 211: The business service device AS1 returns a message of successful download to UE-A, for example, sending a "200 OK" message of the XCAP protocol.

This embodiment uses the configuration access protocol instead of transmitting control information through the media connection, which overcomes the limited content of the control information transmitted through the media connection, which can only be numbers, so that the called AS cannot know the address of the calling AS, thereby The disadvantage of not being able to download content to the calling AS.

In other embodiments, the first business service device AS1 and the CRBT service device AS2 may be the same device. At this time, in step 206, the user equipment UE-A directly sends the early media copy request to the CRBT service device AS2, and AS2 may not perform the step 207-209 copy or download operation. In addition, the first service service device AS1 may not be in the dialogue signaling path, that is, the message in step 201 is not routed to the first service service device AS1, and the temporary response message in step 203 will not be routed to the first service service Equipment AS1, now the early media identification information in the early media copy request message in the step 206 will also include the address of the color ring service service device AS2 (UE-A obtains from the color ring SDP information received), so in step 207, AS1 will directly obtain the address information of the CRBT service device AS2 through the early media identification information.

As shown in Figure 3, it is a basic message flow chart of another embodiment of the CRBT copy in the present invention, which describes that when the calling UE-A calls the called UE-B, the called party activates the CRBT service, and the called network sends a message to the UE. -A plays the color ring early media information, and the calling user wishes to copy the color ring as his own color ring or color image, the steps are as follows:

Steps 301-307 are the same as steps 201-207 in the embodiment shown in FIG. 2;

Step 308: the ring back tone business service device AS2 finds the identification information of the early media content according to the early media identification information, and returns the identification information to the first business service device AS1 through the "200OK" message of the HTTP protocol, and the identification information can be the early media content The file name or serial number, can also include the management device address of the early media content, in this example set as the color ring business service device AS2;

Step 309: The first business service device AS1 judges whether the early media content corresponding to the returned early media content identification information has been managed by it, if yes, skip steps 310-311, and directly execute 312; otherwise, execute step 310;

Step 310: the first business service device AS1 requests the early media content management device AS2 to download the corresponding early media content, such as sending the request through the HTTP protocol or the FTP protocol;

Step 311: the early media content management device AS2 downloads the corresponding early media content from the business service device AS1;

Step 312: The first business service device AS1 associates the early media content as UE-A's CRBT or CRTV content according to the service instruction in the early media copy request sent by the user equipment UE-A;

Step 313: the first business service device AS1 returns a message of successful download to UE-A, for example, sending a "200 OK" message of the XCAP protocol.

In other embodiments, the first service service device AS1 and the CRBT service device AS2 may be one device. At this time, in step 306, UE-A directly sends the early media copy request to the CRBT service device AS2, and AS2 may not perform the steps. 307-311 copy or download operation. In addition, the first business service device AS1 may not be in the dialog signaling path, that is, in step 301, the early media copy request message is not routed to the first business service device AS1, and the temporary response message in step 303 will not be routed either. For the first business service device AS1, the early media identification information in the early media request message sent by UE-A in step 306 will also include the address of the color ring business service device AS2 (UE-A obtains from the color ring SDP information received) obtained), so that in step 307, AS1 will directly obtain the address information of the CRBT service device AS2 through the early media identification information.

As shown in Figure 4, it is a basic message flow chart of a chromatic image copy embodiment of the present invention, which describes that when the calling UE-A calls the called UE-B, the calling party opens the chromatic image service, so the calling network sends UE-B plays the color picture early media information, and the called user wishes to copy the color picture as his own color ring tone or color picture, and the steps are as follows:

Step 401: UE-A calls UE-B, such as sending an INVITE (invitation) message, which can carry UE-A's SDP request. Since UE-A or UE-B has opened the chromatic image service, the message is routed to the second business service Equipment (called chromatic image business service equipment in this embodiment) AS2;

Step 402: The CRBT service device AS2 obtains the SDP information of the chromatic image service from the MRF through a standard process, and then modifies the owner address in the SDP information to the address of the chromatic image service device AS2: for example, revise the "o" in the SDP information " line address content, then add the SDP information of the modified color ring service in the message body and forward it to the called party; or, modify the SDP request in the call message to the SDP request of the color video service and forward it; or, in Add "early-session" content to the message body of the call message, and set this content as the SDP request for the chromatic image service. The message passes through the first business service device AS1, and is forwarded to UE-B by AS1;

Step 403: UE-B sends a provisional response message to the calling party, such as sending a "183 SessionProgress" message starting with "1", the message body carries UE-B's SDP response, and the response message passes through the first business service device AS1 and chromatic image service equipment AS2 finally arrive at UE-A;

Step 404: UE-A, chromatic image service device AS2, first service service device AS1, and UE-B execute the subsequent media resource negotiation process according to the standard procedure, and finally complete the early media resource information negotiation between MRF and UE-B;

Step 405: The chromatic image service device AS2 instructs the MRF to play chromatic image media information to the called party, and UE-B plays the chromatic image media information to the user;

Step 406: The user wants to copy the chromatic image as his own CRBT or color image, so the user equipment UE-B sends a copy request to the first business service device AS1, for example, through the configuration access protocol (XCAP) to the first business service device AS1. Device AS1 sends an HTTP request, which carries early media identification information, and can also carry copy service instructions, such as whether to copy as a ring tone or a color image; the early media identification information is one of dialogue identification, media session information, and media session identification or any combination;

Step 407: The first business service device AS1 receives the copy request, because AS1 is in the dialogue signaling path, it can indirectly know the address information of the color video business service device AS2 according to the early media identification information, and send the copy request to the color video business service device AS2 sends a copy request, such as forwarding an HTTP request to the chromatic image business service device AS2 through the Configuration Access Protocol (XCAP). The copy request sent may not carry a copy business instruction. Before sending the request, the first business service device AS1 may need to pass the XCAP The protocol first requests authentication and authorization from the CRBT service device AS2, and then forwards the request after obtaining the permission of the CRBT service device AS2;

Step 408: The chromatic image business service device AS2 finds early media content information according to the early media identification information, and downloads the content information to the first business service device AS1.

Step 409: After the morning media content is downloaded, the chromatic image business service device AS2 sends a download success message to the first business service device AS1, such as sending a "200 OK" message of the HTTP protocol;

Step 410: The first business service device AS1 associates the downloaded early media content as the CRBT or CRTV content of UE-B according to the service instruction in the early media copy request sent by the user equipment UE-B;

Step 411: the first business service device AS1 returns a message of successful download to UE-B, for example, sending a "200 OK" message of the XCAP protocol.

In other embodiments, the first business service device AS1 and the chromatic image service device AS2 may be the same device. At this time, in step 406, the user equipment UE-B sends the early media copy request directly to the chromatic image service device AS2, and AS2 may not Execute the copy or download operations in steps 407-409. In addition, the first business service device AS1 may not be in the dialogue signaling path, that is, the message in step 402 is not routed to the first business service device AS1, and the temporary response message in step 403 will not be routed to the business service device AS1 either. , this moment, the early media identification information in the early media copy request message of step 406 will also include the address of color image business service equipment AS2 (UE-A obtains from the color ring back tone SDP information that receives), and in step 407 like this, AS1 will The address information of the chromatic image service device AS2 is obtained directly through the early media identification information.

As shown in Figure 5, it is a basic message flow chart of another chromatic image copy embodiment of the present invention, which describes that when the calling UE-A calls the called UE-B, the calling party opens the chromatic image service, so the calling network The process of playing the chromatic image early media information to UE-B, and the called user wishes to copy the chromatic image as his own CRBT or color image, the steps are as follows:

Steps 501-507 are the same as steps 401-407 of the embodiment shown in FIG. 4;

Step 508: The chromatic image business service device AS2 finds the identification information of the early media content according to the early media identification information, and returns the identification information to the first business service device AS1 through the "200 OK" message of the HTTP protocol. The identification information may be the early media content The file name or serial number of the early media content may also include the address of the management device of the early media content, which is set as the chromatic image service device AS2 in this example.

Step 509: whether the early media content corresponding to the early media content identification information returned by the first business service device AS1 has been managed by it, if yes, skip steps 510～511, and directly execute step 512; otherwise, execute step 510;

Step 510: the first business service device AS1 requests the early media content management device AS2 to download the corresponding early media content, such as sending the request through the HTTP protocol or the FTP protocol;

Step 511: the early media content management device AS2 downloads the corresponding early media content to the first business service device AS1;

Step 512: The first business service device AS1 associates the early media content as the color ring or color video content of UE-B according to the service instruction in the early media copy request sent by the user equipment UE-B;

Step 513: the first business service device AS1 returns a message of successful download to UE-B, for example, sending a "200 OK" message of the XCAP protocol.

In other embodiments, the first business service device AS1 and the color image service device AS2 may be the same device. At this time, in step 506, UE-B directly sends the early media copy request to the color image service device AS2, and AS2 may not perform the step 507-511 copy or download operation. In addition, the first business service device AS1 may not be in the dialog signaling path, that is, the message in step 502 is not routed to the first business service device AS1, and the temporary response message in step 503 will not be routed to the first business service device AS1. Equipment AS1, now in step 506, the early media identification information in the early media request message sent by UE-B will also include the address of color image service service device AS2 (UE-A obtains from the color ring back tone SDP information received), like this In step 507, the first business service device AS1 will directly obtain the address information of the chromatic image business service device AS2 through the early media identification information.

The above-mentioned embodiments are all described with a single CRBT service or a single CRBT service, but even with multiple CRBT and multiple CRTV services, this solution is still applicable, because the early media identification information can uniquely determine the early media to be controlled.

The above-mentioned embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention shall be determined by the claims.

Claims (9)

1. a copy method of early media information, is characterized in that, comprises the following steps: The user equipment sends an early media copy request to the first business service device AS through a protocol that does not depend on the media connection, and the request carries at least one of the copy operation instruction and the early media identification information; The first business service device receives the early media copy request, downloads the early media content from the second business service device, and associates the early media content as the early media of the user equipment. the 2. The method according to claim 1, wherein the protocol not dependent on the media connection comprises configuration access protocol XCAP or HTTP protocol. the 3. The method according to claim 1, wherein the copy operation instruction includes an instruction that the early media information is copied as a ring tone or a color image; the early media identification information includes a dialogue identification, a media session identification, One or any combination of media session information, early media service device address. the 4. The method according to claim 1, 2 or 3, wherein the step of downloading the early media content from the second business service device by the first business service device comprises: The first business service device sends an early media download request to the second business service device, and the second business service device sends the identification information of the early media content to the first business service device; The first business service device judges whether the early media content has been managed according to the identification information of the early media content, if not, the first business service device downloads the early media content from the second business service device; If yes, proceed directly to the next steps. the 5. The method according to claim 4, wherein the identification information of the early media content includes one or any combination of a file name, a file number and a file server address of the early media content. the 6. The method according to claim 1, wherein, before the first business service device sends an early media download request to the second business service device, it further includes: The first business service device sends an authentication request to the second business service device; The second business service device authenticates the authentication request sent by the first business service device, and performs subsequent steps after the authentication is passed. the 7. The method according to claim 1, characterized in that, before the user equipment sends the early media copy request to the first business service equipment, it further comprises the steps of: The calling user equipment sends a call request to the called user equipment through the first service service device and the second service service device; The called user equipment sends a temporary response to the second business service device, and the second business service device sends the temporary response to the calling party after adding the identification information of the second business service device to the temporary response user equipment; The calling user equipment, the first business service equipment, the second business service equipment and the called user equipment complete resource negotiation, and the second business service equipment provides early media content for the calling user equipment or the called user equipment , played by the calling user equipment or the called user equipment. 8. The method according to claim 7, wherein the provisional response sent by the called user equipment is a Session Description Protocol (SDP) response. 9. The method according to claim 7 or 8, wherein the method for the second business service device to add the identification information of the second business service device in the provisional response comprises: modifying the identification information of the called user equipment in the provisional response to the identification information of the second service service equipment; or Generate a new provisional response with a session identifier different from the provisional response, where the new provisional response carries the SDP response of the early media service; or Add "early-session" content to the message body of the provisional response, and set this content as the SDP request of the early media service. the

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