CN101415249B - Method, system and apparatus for negotiating data business signaling of session initialization protocol - Google Patents

Abstract

The invention discloses a method for negotiating session initialization protocol (SIP) data service signaling, comprising: the initiator soft switch receives the data service notification from the initiator media gateway; Format message, modify the codec format of the media gateway of the initiator to the redundant codec format; send a message carrying the redundant codec format to the soft switch of the receiving party, so that the soft switch of the receiving party will convert the codec format of the media gateway of the receiving party The decoding format is modified to the redundant codec format. The invention also discloses a SIP data service signaling negotiation system and a soft switch. The invention realizes the negotiation of redundant coding and decoding formats used between gateways carrying out SIP data service transmission, thereby improving the reliability of SIP data service transmission.

Description

Method, system and device for session initiation protocol data service signaling negotiation

technical field

The present invention relates to the field of communication technology, in particular to a method, system and device for session initiation protocol (SIP, Session Initiation Protocol) data service signaling negotiation. the

Background technique

SIP is a text-based session establishment protocol, widely used in Internet, communication network, network protocol (IP, Internet Protocol) multimedia subsystem (IMS, IP Multimedia Subsystem) and other fields. The protocol can realize voice call, video and other services. the

In the 3rd Generation Partnership Project (3GPP, 3rd Generation Partnership Project) R4, when the Nc interface uses the SIP-I protocol, data services such as fax are carried on the IP network. Fax can realize real-time sharing of files and images, and is a data service widely used in existing communication networks. the

FIG. 1 is a structural diagram of a system for implementing data services in a mobile network in the prior art. As shown in Figure 1, the system includes: an initiator terminal, an initiator Media Gateway (MGW, Media Gateway), an initiator Mobile Switching Center (MSC, Mobile Switching Center) server, a receiver terminal, a receiver MGW, and a receiver MSC server. Wherein, the initiator terminal may be indirectly connected to the initiator MGW through other network devices. The initiator terminal and the receiver terminal are respectively the initiator terminal and the receiver terminal of the data service. The initiator MSC server and the initiator MGW are the MSC server and MGW that initiate signaling negotiation; the receiver MSC server and receiver MGW are the MSC server and MGW that respond to the signaling negotiation. The process of implementing data services in the prior art mobile network will be described in detail below by taking both the initiator MSC server and the receiver MSC server supporting the SIP-I protocol as an example. FIG. 2 is a flowchart of a method for signaling negotiation of SIP data services in the system shown in FIG. 1 . As shown in Figure 2, the method includes the following steps:

Step 200: The voice call between the initiator and the receiver has been established, and when the MGW of the initiator detects a data service transmission event, such as a fax event, it reports to the MSC server of the initiator. the

Steps 201 to 202: The initiator MSC server sends a codec modification (MODIFY) message to modify the codec format of the initiator MGW to the G.711 codec format; after the initiator MGW successfully modifies the codec format, it sends The MSC server replies with a codec modification response (MODIFY ACK). the

Step 203: The initiator MSC server uses the update (Update) message of the SIP-I protocol to initiate media renegotiation, and carries the codec format G.711 supported by the initiator MGW in the Session Description Protocol (SDP, Session Description Protocol) description of the Update message /T.38. the

Steps 204 to 205: Receiver's MSC server receives Update, sends MODIFY to receiver's MGW, and modifies the codec format of receiver's MGW to G.711; after receiver's MGW successfully modifies the codec format, it returns to the receiver's MSC server MODIFY ACK. the

Step 206: The receiver MSC server sends 200 OK to the initiator MSC server, wherein the SDP description carries the codec format G.711 selected by the receiver. the

So far, the codec modification of the initiator MGW and the receiver MGW is successful, and the data service is established on the IP bearer between the initiator MGW and the receiver MGW, thereby switching from the voice service to the data service. That is to say, at this time, the negotiated codec format can be used to transmit the data service through the initiator MGW and the receiver MGW. the

When one of the receiver MSC server and the originator MSC server supports the SIP-I protocol, the other does not support the SIP-I protocol, but supports the Bearer Independent Call Control Protocol (BICC, Bearer Independent Call Control Protocol), the existing The system for implementing data services in the mobile network may further include a third-party MSC server and a third-party MGW, and the third-party MSC server is connected to the initiator MSC server and the receiver MSC server to implement the agreement between the initiator MSC server and the receiver MSC server Conversion, the third-party MGW connects with the third-party MSC server, and modifies its codec format under the control of the third-party MSC server; or the system further includes a call mediation node (CMN, Call Mediation Node), wherein the CMN and the initiator MSC server Connect with the MSC server of the receiving party to realize the protocol conversion between the MSC server of the initiator and the MSC server of the receiving party. the

The above data services are carried on the IP network. When the IP network is busy or the network quality is poor, packet loss is prone to occur and the transmission reliability is low. However, data services such as fax and high-speed dial-up Internet access are sensitive to packet loss, that is to say, high transmission reliability is required to realize such data services. It can be seen from the above description that in the existing SIP data service signaling negotiation method, the data service is realized by using G.711, and G.711 is only a codec format, and the transmission service over the IP bearer cannot be improved by using this codec format. reliability, and no other methods to improve transmission reliability are adopted in this scheme. the

Contents of the invention

The embodiment of the present invention provides a method for negotiation of session initialization protocol data service signaling, which improves the reliability of SIP data service transmission. the

The embodiment of the present invention also provides a system for signaling negotiation of session initialization protocol data service, which improves the reliability of SIP data service transmission. the

The embodiment of the present invention also provides a device to improve the reliability of SIP data service transmission. the

In order to achieve the above object, the technical solution of the embodiment of the present invention is achieved in this way:

A method for negotiating session initialization protocol SIP data service signaling, comprising: the initiator soft switch receives the data service notification from the initiator media gateway; sends a message carrying redundant codec format to the initiator media gateway, and sends the initiator The codec format of the media gateway is modified to the redundant codec format; a message carrying the redundant codec format is sent to the receiving soft switch, so that the receiving soft switch modifies the codec format of the receiving media gateway to the specified The redundant codec format described above. the

A system for session initiation protocol SIP data service signaling negotiation, including an initiator soft switch, an initiator media gateway, a receiver soft switch, and a receiver media gateway,

The initiating media gateway is configured to send a data service notification to the initiating soft switch; after receiving a message carrying a redundant codec format from the initiating soft switch, modify its own codec format to the Redundant codec format;

The initiator soft switch is configured to modify the codec format of the initiator media gateway to Redundant codec format; send a message carrying the redundant codec format to the receiving softswitch;

The receiver soft switch is configured to modify the codec format of the receiver media gateway to the redundant codec format according to the message carrying the redundant codec format sent by the initiator soft switch;

The receiver media gateway is configured to modify its own codec format to the redundant codec format under the control of the receiver soft switch. the

A system for session initiation protocol SIP data service signaling negotiation, including an initiator soft switch, an initiator media gateway, a call arbitration node, a receiver soft switch, and a receiver media gateway,

The initiator media gateway is used to send a data service notification to the initiator soft switch; under the control of the initiator soft switch, modify its own codec format to a redundant codec format;

The initiator soft switch is used to modify the codec format of the initiator media gateway to a redundant codec format, and send a call control protocol BICC message that is not related to the bearer to the call arbitration node, which includes the redundant codec IPBCP description of the format;

The call arbitration node is configured to convert the IPBCP description containing the redundant codec format into an SDP description containing the redundant codec format, carry it in a SIP message, and send it to the recipient softswitch;

The receiver soft switch is configured to modify the codec format of the receiver media gateway to the redundant codec format according to the SDP description that includes the redundant codec format carried in the SIP message sent by the call arbitration node. decoding format;

The receiver media gateway is configured to modify its own codec format to the redundant codec format under the control of the receiver soft switch. the

A system for session initiation protocol SIP data service signaling negotiation, including an initiator soft switch, an initiator media gateway, a third-party soft switch, a third-party media gateway, a receiver soft switch, and a receiver media gateway,

The initiator media gateway is used to send a data service notification to the initiator soft switch; under the control of the initiator soft switch, modify its own codec format to a redundant codec format;

The initiator soft switch is configured to modify the codec format of the initiator media gateway to a redundant codec format, and send a bearer-independent call control protocol BICC message to a third-party soft switch, which includes the redundant codec The IPBCP description of the decoded format;

The third-party soft switch is configured to convert the IPBCP description containing the redundant codec format into an SDP description containing the redundant codec format, carry it in a SIP message, and send it to the recipient soft switch ; Send a message carrying the redundant codec format to the third-party media gateway, so as to modify the codec format of the third-party media gateway to the redundant codec format;

The third-party media gateway is configured to modify its own codec format to the redundant codec format after receiving the message carrying the redundant codec format from the third-party soft switch;

The receiver soft switch is configured to modify the codec format of the receiver media gateway to the redundant codec format according to the SDP description containing the redundant codec format carried in the SIP message sent by the third-party soft switch codec format;

The receiving media gateway is configured to modify its own codec format under the control of the receiving soft switch. the

A system for session initiation protocol SIP data service signaling negotiation, including an initiator soft switch, an initiator media gateway, a call arbitration node, a receiver soft switch, and a receiver media gateway,

The initiator media gateway is used to send a data service notification to the initiator soft switch; under the control of the initiator soft switch, modify its own codec format to a redundant codec format;

The initiator soft switch is configured to modify the codec format of the initiator media gateway to a redundant codec format, and send a SIP message to the call arbitration node, which carries a session description protocol SDP description containing the redundant codec format ;

The call arbitration node is configured to convert the SDP description containing the redundant codec format into an IP Bearer Control Protocol IPBCP description containing the redundant codec format, and carry it in the bearer-independent call control protocol BICC message In, sent to the receiver soft switch;

The recipient soft switch is configured to modify the codec format of the media gateway of the recipient to the redundant codec format;

The receiver media gateway is configured to modify its own codec format to the redundant codec format under the control of the receiver soft switch. the

A system for session initiation protocol SIP data service signaling negotiation, including an initiator soft switch, an initiator media gateway, a third-party soft switch, a third-party media gateway, a receiver soft switch, and a receiver media gateway,

The initiator media gateway is used to send a data service notification to the initiator soft switch; under the control of the initiator soft switch, modify its own codec format to a redundant codec format;

The initiator soft switch is used to modify the codec format of the initiator media gateway to a redundant codec format, and send a SIP message to the third-party soft switch, which carries the session description protocol SDP containing the redundant codec format describe;

The third-party soft switch is configured to convert the SDP description containing the redundant codec format into an IP bearer control protocol IPBCP description containing the redundant codec format, and carry it in the bearer-independent call control protocol BICC In the message, send to the soft switch of the receiving party; send a message carrying the redundant codec format to the third-party media gateway, so as to modify the codec format of the third-party media gateway to the redundant codec format;

The third-party media gateway is configured to modify its own codec format to the redundant codec format after receiving the message carrying the redundant codec format from the third-party soft switch;

The receiver soft switch is configured to modify the codec format of the receiver media gateway to the redundant codec format according to the IPBCP description containing the redundant codec format carried in the BICC message sent by the third-party soft switch codec format;

The receiver media gateway is configured to modify its own codec format to the redundant codec format under the control of the receiver soft switch. the

A soft switch, including a receiving module, a modification module and a message sending module,

The receiving module is used to receive the data service notification sent by the initiator media gateway;

The modification module is used to modify the codec format of the initiator media gateway to a redundant codec format after the receiving module receives the data service notification;

The message sending module is configured to send a SIP message or BICC message carrying a redundant codec format to the receiving softswitch or a third-party softswitch. the

A soft switch, comprising: a message receiving module, a modification module and a response module,

The message receiving module is used to receive SIP messages or BICC messages carrying redundant codec formats from the initiator soft switch or third-party soft switch;

The modifying module is used to modify the codec format of the receiver's media gateway to the redundant codec format according to the SIP message or BICC message received by the message receiving module;

The response module is configured to send a response message carrying the redundant codec format to the initiating softswitch or a third-party softswitch after the modifying module successfully modifies the codec of the receiving media gateway. the

A soft switch, including a BICC receiving module, a conversion module and a SIP sending module,

The BICC receiving module is used to receive a call control protocol BICC message that has nothing to do with bearer, which carries an IP bearer control protocol IPBCP description that includes a redundant codec format;

The conversion module is used to convert the IPBCP description received by the BICC receiving module into a SIP-based session description protocol SDP description;

The SIP sending module is configured to carry the SDP description converted by the conversion module in the SIP message and send it out. the

A soft switch, including a SIP receiving module, a conversion module and a BICC sending module,

The SIP receiving module is used to receive a session initiation protocol SIP message, which carries a session description protocol SDP description including a redundant codec format;

The conversion module is used to convert the SDP description received by the SIP receiving module into an IP bearer control protocol IPBCP description based on a bearer-independent call control protocol BICC;

The BICC sending module is configured to carry the IPBCP description converted by the conversion module in a BICC message and send it out. the

Compared with the prior art, in the technical solution provided by the embodiment of the present invention, after receiving the data service notification sent by the initiator MGW, the initiator MSC server sends a message carrying a redundant codec format to the initiator MGW, and The initiator MGW modifies the codec format to the redundant codec format, and then sends a message carrying the redundant codec format to the receiver MSC server, so that the receiver MSC server can modify the codec format of the receiver MGW to the redundant codec format. decoding format, so as to realize the negotiation of the redundant codec format between the initiator MGW and the receiver MGW, so that when the SIP data service is transmitted, the redundant packet of the frame sent later contains the frame sent earlier, and the frame sent earlier When a frame is lost, it can be replaced by the corresponding frame of the redundant packet in the following frame, thereby improving the reliability of SIP data service transmission. the

Description of drawings

Fig. 1 is the system structural diagram that realizes data service in prior art mobile network;

Fig. 2 is the method flowchart of SIP data service signaling negotiation in the system shown in Fig. 1;

Fig. 3 is the flow chart of the method for SIP facsimile service signaling negotiation of embodiment one of the present invention;

Fig. 4 is the method flowchart of SIP facsimile service signaling negotiation of embodiment 2 of the present invention;

Fig. 5 is the method flowchart of SIP facsimile service signaling negotiation of embodiment 3 of the present invention;

6 is a flow chart of a method for SIP fax service signaling negotiation in Embodiment 4 of the present invention;

FIG. 7 is a flow chart of a method for SIP fax service signaling negotiation in Embodiment 5 of the present invention;

Fig. 8 is the flow chart of the method for SIP fax service signaling negotiation of the sixth embodiment of the present invention;

Fig. 9 is a kind of system structural diagram of SIP data service signaling negotiation in the embodiment of the present invention;

FIG. 10 is another system structure diagram of SIP data service signaling negotiation in the embodiment of the present invention. the

Detailed ways

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

In the method for negotiating session initialization protocol data service signaling provided by the embodiment of the present invention, after receiving the data service notification from the initiator MGW, the initiator softswitch sends a message carrying a redundant codec format to the initiator MGW to initiate Modify the codec format of the MGW of the receiving party to the redundant codec format; send a message carrying the redundant codec format to the soft switch of the receiving party, so that the soft switch of the receiving party modifies the codec format of the MGW of the receiving party to the redundant codec format codec format. the

The redundant codec format is a codec format formed by combining an existing codec format and a redundant mode. The existing codec format can be G.711, T.38, etc., and the redundant mode can be It is RFC2198. In the following embodiments, take the facsimile service, the soft switch is the MSC server in the mobile network, and the redundant codec format G.711 redundancy formed by the combination of G.711 and redundant mode RFC2198 is an example, for the SIP data service of the present invention The signaling negotiation method will be described in detail. the

Embodiment one:

This embodiment describes in detail the scheme for realizing the SIP data service signaling negotiation under the condition that both the initiator MSC server and the receiver MSC server support the SIP protocol. the

FIG. 3 is a flowchart of a method for signaling negotiation of a SIP fax service according to Embodiment 1 of the present invention. As shown in Figure 3, the method includes the following steps:

Step 300: The voice call between the initiator and the receiver has been established, and the MGW of the initiator detects a fax event and reports it to the MSC server of the initiator. the

Steps 301 to 302: the initiator MSC server sends MODIFY to the initiator MGW to modify the codec format of the initiator MGW to the redundant codec format of G.711 Redundancy (G.711Red). the

Among them, MODIFY contains the SDP description of G.711 redundancy. In addition to the description of the codec format, it further includes the redundancy level. For example, the specific description can be:

m=audio-RTP/AVP 897 //2 payload types (PT, Payload Type), 97 and 8 respectively (8 represents the G.711 codec format)

a=rtpmap:97 red/8000/1 //PT=97 is the payload type, red means use the RFC2198 redundancy method, 8000 is the codec rate, and 1 is the redundancy level. the

a=fmtp:978/8//Indicates that the frame using the G.711 codec format, that is, the frame with PT=8 is redundant, and the redundancy level is 1. the

The codec format negotiated according to the SDP description is such that the PT of the sent RTP packet is 97, and there are multiple redundant data frames in the packet, and the PT of the data frame is 8. the

Wherein, G.711 redundancy refers to a redundant codec format obtained by combining the codec format of G.711 and the redundancy mode RFC2198. The RFC2198 redundancy method means that the first redundant packet only carries the current frame, and the redundant packets transmitted later carry the previously sent frames. The redundancy level refers to the number of previously transmitted frames carried in the redundant packets transmitted later. For example, each redundant packet carries how many frames previously transmitted, that is, the redundancy level, which is specified by the fmtp parameter, such as a=fmtp:978/8, which means that the data frame whose codec format is G.711 is redundant, The redundancy level is 1, that is, a G.711 encoded data frame sent earlier is carried in the redundant packet sent later; a=fmtp;978/8/8, indicating that the redundancy level is 2, that is, in the back The redundant packet sent carries the two previously sent G.711 encoded data frames. the

Step 303: The initiator MSC server uses Update of the SIP protocol to initiate media renegotiation, and the SDP description of Update carries parameters such as codec format G.711 redundancy (G.711Red) and redundancy level. the

In this step, the SDP description may use the SDP description in step 301 . the

Step 304～Step 306: Receiver MSC server receives Update, sends MODIFY to receiver MGW, and the codec format of receiver MGW is changed to G.711Red; Send MODIFY ACK; the receiver MSC server sends 200 OK to the initiator MSC server after receiving it, and the codec format in the SDP description carried in it is the redundant codec format G.711red. the

When the receiver MSC server modifies the codec format of the receiver MGW, it can further select the redundancy level supported by the receiver MGW; in the 200 OK SDP description returned by the receiver MSC server to the initiator MSC server, except for the codec format In addition to G.711Red, redundancy levels can also be included. the

So far, the codec modification is successful, and the fax is established on the IP bearer between the initiator MGW and the receiver MGW, thus switching from the voice service to the fax service, that is, the negotiated redundancy can be used through the initiator MGW and the receiver MGW. The other codec formats are used for the transmission of fax services. the

The method of this embodiment may further include: Step 307-Step 308: If the redundancy level replied by the receiver MGW is inconsistent with the redundancy level modified by the initiator MGW, the initiator MSC server sends MODIFY to the initiator MGW to Modify the redundancy level of the initiator MGW to a value consistent with the redundancy level replied by the receiver MGW. the

For example, after the negotiation of the codec format and redundancy level in the above SDP description is successful, when the data service is transmitted, the redundant packet of the data frame to be transmitted later will carry a data frame that has been transmitted earlier, and use G .711 codec format for transmission, thereby avoiding the loss of a data frame transmitted earlier and improving the reliability of data service transmission. the

In other embodiments of the present invention, the media renegotiation process between the initiator MSC server and the receiver MSC server can also be implemented using the Invite of the SIP protocol, that is, the initiator MSC server receives the fax reported by the initiator MGW After the event, use Invite to initiate a media renegotiation to the receiving MSC server, which at least contains the SDP description carrying the redundant codec format G.711Red; after receiving the 200 OK reply from the receiving MSC server, return to the receiving MSC server ACK to complete media renegotiation. the

This implementation adopts the G.711Red redundant codec format. After the signaling negotiation is completed, when transmitting data frames, the redundant packets of the subsequent transmitted frames include the previously transmitted frames. If the previously transmitted frames are lost, Then, redundant packets in subsequent transmitted frames can be used instead, thereby improving the transmission reliability of the data service. the

Embodiment two:

In this embodiment, for the case where both the initiator MSC server and the receiver MSC server support the SIP protocol, but the receiver MGW does not support the redundant codec format of G.711Red, the scheme for implementing data service signaling negotiation is described in detail. the

FIG. 4 is a flowchart of a method for signaling negotiation of a SIP fax service according to Embodiment 2 of the present invention. As shown in Figure 4, the method includes the following steps:

Steps 400 to 403 are the same as steps 300 to 303, and will not be repeated here. the

Step 403: The initiator MSC server initiates media renegotiation using Update of the SIP protocol. The SDP description of Update carries all codec formats supported by the initiator MGW, such as G.711Red, G.711, and T.38, and can also carry Redundancy level when using the G.711Red codec format. the

Step 404: The receiving MSC server receives the Update, queries the codec format supported by the receiving MGW saved by itself, and finds that the receiving MGW does not support G.711Red, but supports G.711 and T.38, and sends it to the receiving MGW MODIFY, modifying the codec format of the receiving MGW to G.711 or T.38. In this embodiment, G.711 is taken as an example. the

Step 405: After successfully modifying the codec format, the receiver MGW replies MODIFY ACK to the receiver MSC server. the

Step 406: After receiving the MODIFY ACK from the receiver MGW, the receiver MSC server sends 200 OK to the initiator MSC server, in which the SDP description carried includes the codec format G.711. the

Wherein, when the receiver MSC server selects the codec format supported by the receiver MGW from the codec formats of the Update sent by the initiator MSC server, it usually selects the first codec format supported by the receiver MGW. In this embodiment, among the codec formats of the Update sent by the initiator MSC server, the first one is G.711, so the G.711 codec format is selected. the

In this embodiment, when the codec format used in the voice call is the same as the codec format selected by the receiving MSC server, steps 404 to 405 can be omitted. the

Steps 407 to 408: The initiator MSC server finds that the codec format carried in the 200 OK returned by the receiver MSC server is different from the codec format modified by the initiator MGW, and then sends MODIFY to the initiator MGW to convert the initiator MGW to the initiator MGW. The codec format of MGW is modified to the codec format carried in 200 OK. the

So far, the codec modification is successful, and the fax is established on the IP bearer between the initiator MGW and the receiver MGW, thus switching from the voice service to the fax service, that is, the negotiated codec can be used through the initiator MGW and the receiver MGW. The decoding format is used for the transmission of fax services. the

In this implementation, when the receiver network does not support the redundant codec format of G.711Red, the initiator MSC server can send all the codec formats supported by the initiator MGW to the receiver MSC server for selection by the receiver MSC server , which improves compatibility with networks that do not support redundant codecs. the

Embodiment three:

In this embodiment, when the initiator MSC server supports the BICC protocol, and the receiver MSC server supports the SIP protocol, the SIP data service participated by the third-party MSC server, that is, the MSC server used for protocol conversion, and the third-party MGW The signaling negotiation scheme is described in detail. the

FIG. 5 is a flowchart of a method for signaling negotiation of a SIP fax service in Embodiment 3 of the present invention. As shown in Figure 5, the method includes the following steps:

Steps 500 to 502 are the same as steps 300 to 302, and will not be repeated here. the

Step 503: The initiator MSC server carries the redundant codec format G.711Red in the description of the IP Bearer Control Protocol (IPBCP, IP Bearer Control Protocol) through the Application Transport Mechanism (APM, Application Transport Mechanism) message of the BICC, and sends it to the first Three-party MSC server. the

In this step, the IPBCP description may further include redundancy levels. the

The IPBCP description in the prior art does not carry information about redundancy, and the IPBCP description in the embodiment of the present invention borrows the description method of SDP description for media to carry information about redundancy. The description of the media in the IPBCP description in this step may be the same as the description of the media in the SDP description in Embodiment 1. the

Steps 504 to 505: After receiving the APM message, the third-party MSC server converts the IPBCP description in the APM message into an SDP description, and modifies the codec format of the third-party MGW to G.711Red, and the third-party MGW successfully modifies the codec format After that, reply MODIFY ACK to the receiving MSC server. the

Steps 506 to 509: The third-party MSC server initiates media renegotiation, including: the third-party MSC server sends an Invite of the SIP protocol to the receiving MSC server, which carries the SDP description containing the redundant codec format G.711Red; the receiving party After the MSC server modifies the codec format of the receiver MGW to G.711Red, it replies 200 OK to the third-party MSC server, and the SDP description carries the redundant codec format G.711Red. the

If the message transmitted in the media renegotiation further carries the redundancy level adopted by the redundant codec format, the method for signaling negotiation of the fax service in this embodiment may further include: Step 510-Step 511: If the receiving party The redundancy level described by the SDP in the 200 OK returned by the MSC server is different from the redundancy level of the codec format modified by the third-party MGW, so the third-party MSC server needs to use MODIFY to notify the third-party MGW to modify the redundancy level of the communication with the receiver . Of course, since the redundancy levels used by the MGWs for data transmission may be different, when the redundancy level is carried in the message transmitted during media renegotiation, steps 510 to 511 may not be performed. the

Step 512: The third-party MSC server replies an ACK to the recipient MSC server. the

The method in this embodiment may further include step 513: notify the initiator using the BICC to modify the codec format successfully, that is, send a BICC-based APM message to the initiator MSC server, indicating that the codec format is successfully modified. the

So far, the codec modification is successful, and the fax is established on the IP bearer between the initiator MGW and the receiver MGW, thus switching from the voice service to the fax service, that is, the negotiated redundancy can be used through the initiator MGW and the receiver MGW. The other codec formats are used for the transmission of fax services. the

In other embodiments of the present invention, the media renegotiation process between the third-party MSC server and the receiver MSC server can also be implemented using Update of the SIP protocol, that is, after the initiator MSC server receives the fax event reported by the initiator MGW, it uses Update initiates media renegotiation, which includes the SDP description carrying the redundant codec format G.711Red and redundancy level; after receiving the 200 OK reply from the receiving MSC server, the media renegotiation is completed. the

In this implementation, during the SIP data service signaling negotiation between the initiator network and the receiver network using different protocols, a third-party MSC server is used to convert the BICC-based IPBCP description into the SIP-based SDP description, realizing the use of different protocols Signaling negotiation of data services between networks, so that both the initiator MGW and the receiver MGW can use the G.711Red redundant codec format. After the signaling negotiation is completed, when data frames are transmitted between the initiator MGW, the third-party MGW, and the receiver MGW, the redundant packets of the later transmitted frames contain the previously transmitted frames, so the previously transmitted frames When it is lost, it can be replaced by the corresponding frame in the redundant packet transmitted later, thereby improving the transmission reliability of the data service. the

Embodiment four:

This embodiment supports the BICC protocol for the initiator MSC server, and under the situation that the receiver MSC server supports the SIP protocol, only the third-party MSC server, that is, the CMN, participates in the scheme of realizing the data service signaling negotiation in detail. the

FIG. 6 is a flowchart of a method for SIP fax service signaling negotiation according to Embodiment 4 of the present invention. Since the interaction process between the initiator MSC server and the initiator MGW in this embodiment and the interaction process between the receiver MSC server and the receiver MGW are the same as those in Embodiment 1, they are omitted in the description of this embodiment. the

As shown in Figure 6, the method for SIP fax service signaling negotiation in the present embodiment includes the following steps:

Step 600: The initiator MSC server sends an APM message to the BICC side of the CMN, in which the IPBCP description carries the redundant codec format G.711Red, for example, the IPBCP description described in Embodiment 3 can be used. the

In this step, the IPBCP description may further carry a redundancy level. the

Steps 601 to 603: CMN converts the IPBCP description carried in the APM message into an SDP description; and initiates a media renegotiation process, including: CMN sends an Invite to the MSC server of the receiving party, wherein the redundant codec format carried in the SDP description is G.711Red; the receiving MSC server replies 200 OK to the CMN, and the SDP description carries the redundant codec format G.711 Red; after receiving the 200 OK, the CMN replies ACK to the receiving MSC server. the

Step 604: The CMN sends a BICC-based APM message to the initiating MSC server, indicating that the modification of the codec format is successful. the

If the message sent in step 604 indicates that the receiver MSC server accepts a different level of redundancy than the initiator MSC server's request, then steps 307 to 308 may be further executed. the

So far, the codec modification is successful, and the fax is established on the IP bearer between the initiator MGW and the receiver MGW, thus switching from the voice service to the fax service, that is, the negotiated codec can be used through the initiator MGW and the receiver MGW. The decoding format is used for the transmission of fax services. the

In other embodiments of the present invention, the media renegotiation process initiated by the CMN can also be implemented using Update of the SIP protocol. the

In this embodiment, when using different protocols for the SIP data service signaling negotiation between the initiator MSC server and the receiver MSC server, the CMN is used to convert the BICC-based IPBCP description into a SIP-based SDP description, realizing the use of different protocols. Signaling negotiation of data services between networks, so that both the initiator MGW and the receiver MGW can use the G.711Red redundant codec format. After the signaling negotiation is completed, when data frames are transmitted between the initiator MGW, CMN, and receiver MGW, the MGW includes the previously transmitted frames in the redundant packets of the later transmitted frames, so when the previously transmitted frames are lost , can be replaced by the corresponding frame in the redundant packet transmitted later, thereby improving the transmission reliability of the data service. the

Embodiment five:

In this embodiment, when the initiator MSC server supports the SIP protocol, and the recipient MSC server supports the BICC protocol, the SIP data service signal that the third-party MSC server, that is, the MSC server used for protocol conversion, and the third-party MGW participates in The negotiated plan will be described in detail. the

FIG. 7 is a flowchart of a method for SIP fax service signaling negotiation according to Embodiment 5 of the present invention. As shown in Figure 7, the method includes the following steps:

Steps 700 to 702 are the same as steps 500 to 502, and will not be repeated here. the

Step 703: The initiator MSC server sends the redundant codec format G.711Red in the SDP description through the SIP message Invite, and sends it to the third-party MSC server. the

In this step, the SDP description can use the SDP description method described in step 301 . Redundancy levels can be further included in the SDP description. the

Steps 704 to 705: After receiving the Invite message, the third-party MSC server converts the SDP description in the message into an IPBCP description, and modifies the codec format of the third-party MGW to G.711Red, and the third-party MGW successfully modifies the codec After formatting, reply MODIFY ACK to the receiving MSC server. the

Steps 706 to 709: The third-party MSC server initiates media renegotiation, including: the third-party MSC server sends an APM message of BICC to the receiving MSC server, which carries an IPBCP description containing redundant codec format G.711Red; the receiving party After modifying the codec format of the receiver MGW to G.711Red, the MSC server replies to the third-party MSC server with an APM message carrying the codec format, indicating that the codec format of the receiver side has been modified successfully. the

If the message transmitted in the media renegotiation further carries the redundancy level adopted by the redundant codec format, the method for signaling negotiation of the fax service in this embodiment may further include: Step 710-Step 711: the receiver MSC The server uses MODIFY to notify the third-party MGW to modify the redundancy level of communication with the receiver. the

Step 712-Step 713: The third-party MSC server sends OK to the initiator MSC server 200, and the initiator MSC server replies ACK to the third-party MSC server. the

So far, the codec modification is successful, and the fax is established on the IP bearer between the initiator MGW and the receiver MGW, thus switching from the voice service to the fax service, that is, the negotiated redundancy can be used through the initiator MGW and the receiver MGW. The other codec formats are used for the transmission of fax services. the

In other embodiments of the present invention, the interaction between the originator MSC server and the third-party MSC can also be implemented using the Update of the SIP protocol, that is, after the originator MSC server receives the fax event reported by the originator MGW, it sends a message to the third-party MSC server Send an Update message, which contains the SDP description carrying the redundant codec format G.711Red and redundancy level; the third-party MSC server will reply 200 OK to the initiator MSC server after receiving the APM message replied by the receiving MSC server. the

In this implementation, when negotiating SIP data service signaling between the initiator network and the receiver network using different protocols, a third-party MSC server is used to convert SIP-based SDP descriptions into BICC-based IPBCP descriptions, realizing the use of different protocols Signaling negotiation of data services between networks, so that both the initiator MGW and the receiver MGW can use the redundant codec format of G.711Red. After the signaling negotiation is completed, the initiator MGW, the third-party MGW, and the receiver When data frames are transmitted between the MGWs, the redundant packets of the later transmitted frames contain the previously transmitted frames, so when the previously transmitted frames are lost, the corresponding frames in the later transmitted redundant packets can be used instead. Therefore, the transmission reliability of the data service is improved. the

Embodiment six:

In this embodiment, when the originating MSC server supports the SIP protocol and the receiving MSC server supports the BICC protocol, only the third-party MSC server, that is, the CMN, participates in a solution for implementing data service signaling negotiation in detail. the

FIG. 8 is a flowchart of a method for signaling negotiation of a SIP fax service according to Embodiment 6 of the present invention. Since the interaction process between the initiator MSC server and the initiator MGW in this embodiment and the interaction process between the receiver MSC server and the receiver MGW are the same as those in Embodiment 1, they are omitted in the description of this embodiment. the

As shown in Figure 8, the method for SIP fax service signaling negotiation in this embodiment includes the following steps:

Step 800: The initiator MSC server sends an Invite to the CMN, in which the redundant codec format carried in the SDP description is G.711Red. the

In this step, the SDP description may further carry a redundancy level. the

Steps 801 to 802: CMN converts the SDP description carried in the Invite message into an IPBCP description; and initiates a media renegotiation process, including: CMN sends an APM message to the receiving MSC server, in which the IPBCP description carries redundant codec formats ; The receiver's MSC server replies to the CMN with an APM message, indicating that the modification of the codec format is successful. the

Steps 803 to 804: CMN replies 200 OK to the initiator MSC server, in which the SDP description carries redundant codec format G.711Red; after receiving 200 OK, CMN replies ACK to the initiator MSC server. the

If the message sent in step 803 indicates that the receiver MSC server accepts a different level of redundancy than the request from the initiator MSC server, then steps 307 to 308 may be further performed. the

So far, the codec modification is successful, and the fax is established on the IP bearer between the initiator MGW and the receiver MGW, thus switching from the voice service to the fax service, that is, the negotiated codec can be used through the initiator MGW and the receiver MGW. The decoding format is used for the transmission of fax services. the

In other embodiments of the present invention, the message exchange between the initiator MSC server and the CMN can also be implemented by using the Update message of the SIP protocol. the

In this embodiment, when using different protocols for the SIP data service signaling negotiation between the initiator MSC server and the receiver MSC server, the CMN is used to convert the SIP-based SDP description into the BICC-based IPBCP description, realizing the use of different protocols Signaling negotiation of data services between networks, so that both the initiator MGW and the receiver MGW can use the redundant codec format of G.711Red. After the signaling negotiation is completed, the initiator MGW, CMN, and receiver MGW When transmitting data frames, the MGW includes the previously transmitted frame in the redundant packet of the later transmitted frame, so when the previously transmitted frame is lost, it can be replaced by the corresponding frame in the later transmitted redundant packet, thereby improving The transmission reliability of data services is improved. the

The embodiment of the invention also provides a system for implementing data services. FIG. 9 is a system structure diagram of SIP data service signaling negotiation in an embodiment of the present invention. As shown in FIG. 9 , the system includes: an initiator soft switch, an initiator media gateway, a receiver soft switch, and a receiver media gateway. the

Among them, the initiator media gateway is used to send data service notifications to the initiator soft switch; after receiving the message carrying the redundant codec format from the initiator soft switch, modify its own codec format to redundant codec Format. the

The initiator soft switch is used to modify the codec format of the initiator media gateway to redundant by sending a message carrying the redundant codec format to the initiator media gateway after receiving the data service notification sent by the initiator media gateway codec format; and send a message carrying redundant codec format to the receiving softswitch. the

The receiver soft switch is configured to modify the codec format of the receiver media gateway to the redundant codec format according to the message carrying the redundant codec format sent by the initiator soft switch. the

The receiver media gateway is configured to modify its own codec format to a redundant codec format under the control of the receiver soft switch. the

When the initiator soft switch further carries other codec formats supported by the initiator media gateway in the message carrying the redundant codec format sent to the receiver soft switch, the receiver soft switch further determines whether the receiver media gateway supports redundant codec formats. If yes, modify the codec format of the media gateway of the receiving party to the redundant codec format according to the message sent by the initiating softswitch to itself; otherwise, select the codec format supported by the media gateway of the receiving party in the message, and convert The codec format of the receiving media gateway is changed to the selected codec format. the

Specifically, the initiator soft switch includes a receiving module, a modifying module and a message sending module. Wherein, the receiving module is used to receive the data service notification sent by the media gateway of the initiator; the modification module is used to modify the codec format of the media gateway of the initiator to a redundant codec format after the receiving module receives the data service notification; The message sending module is used to send the SIP message carrying the redundant codec format to the receiving soft switch. In other embodiments, the message sending module may also send the BICC message carrying the redundant codec format to the third-party soft switch. the

The modification module is also used to receive a response message carrying a redundant codec format and a redundancy level from the receiver soft switch, and when the redundancy level is different from the codec format modified by the media gateway of the initiator, modify the media gateway of the initiator codec format. the

The receiver soft switch specifically includes a message receiving module, a modification module and a response module. Wherein, the message receiving module is used to receive a SIP message carrying a redundant codec format from the initiator soft switch; or in other embodiments, receive a SIP message or a BICC message from a third-party soft switch, which carries a redundant codec format decode format. The modification module is configured to modify the codec format of the media gateway of the receiver to the redundant codec format according to the SIP message received by the message receiving module (in other embodiments, it may be a BICC message carrying a redundant codec format). The response module is configured to send a response message carrying a redundant codec format to the initiating softswitch (or a third-party softswitch in other embodiments) after the modifying module successfully modifies the codec of the receiving media gateway. The response message may further carry a redundancy level. the

FIG. 10 is another system structure diagram of SIP data service signaling negotiation in the embodiment of the present invention. As shown in FIG. 10 , the system includes an initiator soft switch, an initiator media gateway, a third-party soft switch, a third-party media gateway, a receiver soft switch, and a receiver media gateway. the

When the initiator softswitch supports BICC and the receiver softswitch supports SIP, the initiator media gateway is used to send data service notifications to the initiator softswitch; under the control of the initiator softswitch, modify its codec format to Redundant codec format. The initiator soft switch is used to modify the codec format of the initiator media gateway to a redundant codec format, and send a BICC message to the third-party soft switch, which carries the IPBCP description including the redundant codec format. The third-party soft switch is used to convert the IPBCP description containing the redundant codec format into the SDP description containing the redundant codec format, carry it in the SIP message, and send it to the receiving soft switch; send the carried message to the third-party media gateway Redundant codec format message to modify the codec format of the third-party media gateway to redundant codec format. The third-party media gateway is used to modify its own codec format to a redundant codec format after receiving the message carrying the redundant codec format from the third-party soft switch. The receiver soft switch is configured to modify the codec format of the receiver media gateway to the redundant codec format according to the SDP description including the redundant codec format carried in the SIP message sent by the third-party soft switch. The receiver media gateway is configured to modify its own codec format to a redundant codec format under the control of the receiver soft switch. the

Specifically, the third-party soft switch includes a BICC receiving module, a conversion module, a modification module and a SIP sending module, wherein the BICC receiving module is used to receive BICC messages, which carry IPBCP descriptions containing redundant codec formats; the conversion module , used to convert the IP bearer control protocol IPBCP description received by the BICC receiving module into a SIP-based session description protocol SDP description; the modification module is used to convert the codec of the third-party media gateway according to the redundant codec format obtained by the conversion module The format is modified to a redundant codec format; the SIP sending module is used to carry the SDP description converted by the conversion module in the SIP message and send it out. the

When the initiator soft switch supports SIP and the receiver soft switch supports BICC, the initiator media gateway is used to send data service notifications to the initiator soft switch; under the control of the initiator soft switch, modify its codec format It is a redundant codec format. The initiator soft switch is configured to modify the codec format of the initiator media gateway to a redundant codec format, and send a SIP message to the third-party soft switch, which carries the SDP description including the redundant codec format. The third-party soft switch is used to convert the SDP description containing the redundant codec format into the IPBCP description containing the redundant codec format, carry it in the BICC message, and send it to the receiving soft switch; send the carried message to the third-party media gateway Redundant codec format message to modify the codec format of the third-party media gateway to redundant codec format. The third-party media gateway is configured to modify its own codec format to a redundant codec format after receiving the message carrying the redundant codec format from the third-party soft switch. The receiver soft switch is configured to modify the codec format of the receiver media gateway to the redundant codec format according to the IPBCP description including the redundant codec format carried in the BICC message sent by the third-party soft switch. The receiver media gateway is configured to modify its own codec format to a redundant codec format under the control of the receiver soft switch. the

Specifically, the third-party soft switch includes a SIP receiving module, a converting module, a modifying module and a BICC sending module. Wherein, the SIP receiving module is used to receive the SIP message, which carries the SDP description including the redundant codec format. The conversion module is used to convert the SDP description received by the SIP receiving module into the PBCP description of the BICC. The modification module is configured to modify the codec format of the third-party media gateway to a redundant codec format according to the redundant codec format obtained by the conversion module. The BICC sending module is used to carry the IPBCP description converted by the conversion module in the BICC message and send it out. the

Another SIP data service signaling negotiation system of the present invention includes an initiator soft switch, an initiator media gateway, a call arbitration node, a receiver soft switch, and a receiver media gateway. the

When the initiator soft switch supports BICC and the receiver soft switch supports SIP, the initiator media gateway is used to send data service notifications to the initiator soft switch; under the control of the initiator soft switch, modify its codec format It is a redundant codec format. The initiator soft switch is used to modify the codec format of the initiator media gateway to the redundant codec format, and send the BICC message to the call arbitration node, which carries the IPBCP description including the redundant codec format. The call arbitration node is used to convert the IPBCP description containing the redundant codec format into an SDP description containing the redundant codec format, carry it in the SIP message, and send it to the receiving softswitch. The receiver soft switch is configured to modify the codec format of the receiver media gateway to a redundant codec format according to the SDP description including the redundant codec format carried in the SIP message sent by the call arbitration node. The receiver media gateway is configured to modify its own codec format to a redundant codec format under the control of the receiver soft switch. the

Specifically, the call arbitration node includes a BICC receiving module, a converting module and a SIP sending module. Among them, the BICC receiving module is used to receive and BICC message, which carries the IPBCP description including redundant codec format; the conversion module is used to convert the IPBCP description received by the BICC receiving module into a SIP-based SDP description; the SIP sending module, It is used to carry the SDP description converted by the conversion module in the SIP message and send it out. the

When the initiator soft switch supports SIP and the receiver soft switch supports BICC, the initiator media gateway is used to send data service notifications to the initiator soft switch; under the control of the initiator soft switch, modify its codec format It is a redundant codec format. The initiator soft switch is used to modify the codec format of the initiator media gateway to a redundant codec format, and send a SIP message to the call arbitration node, which carries the SDP description containing the redundant codec format. The call arbitration node is used to convert the SDP description containing the redundant codec format into the IPBCP description containing the redundant codec format, carry it in the BICC message, and send it to the receiving softswitch. The receiver soft switch is configured to modify the codec format of the receiver media gateway to the redundant codec format according to the IPBCP description including the redundant codec format carried in the BICC message sent by the call arbitration node. The receiver media gateway is configured to modify its own codec format to a redundant codec format under the control of the receiver soft switch. the

Specifically, the call arbitration node includes a SIP receiving module, a converting module and a BICC sending module. Among them, the SIP receiving module is used to receive SIP messages, which carry the SDP description that contains redundant codec formats; the conversion module is used to convert the SDP description received by the SIP receiving module into an IPBCP description based on BICC; the BICC sending module uses To carry the IPBCP description converted by the conversion module in the BICC message and send it out. the

It can be seen from the above that the technical solution provided by the embodiment of the present invention realizes the negotiation of the redundant codec format between the initiator MGW and the receiver MGW, so that when the SIP data service is transmitted, the frames sent later The redundant packet of the SIP includes the previously sent frame, and when the previously sent frame is lost, it can be replaced by the corresponding frame in the redundant packet of the following frame, thereby improving the reliability of SIP data service transmission. the

Further, in the technical solution provided in the embodiment of the present invention, when the initiator MSC server supports BICC and the recipient MSC server supports SIP, the IPBCP description in the BICC message can be converted into an SDP description through a third-party MSC server or CMN, Then carry it in the SIP message and send it to the receiver; when the initiator MSC server supports SIP and the receiver MSC server supports BICC, the SDP description in the SIP message can be converted into an IPBCP message through a third-party MSC server or CMN, and then carried Sent to the recipient MSC server in a BICC message. Therefore, the negotiation of the redundant codec mode is realized between the initiator and the receiver using different protocols, and the reliability of SIP data service transmission is improved. the

The initiator MSC server can send all codec formats supported by the initiator MGW to the receiver MSC server for selection by the receiver MSC server. When the receiver MGW does not support the redundant codec format of G.711Red, it can choose to receive Both the source MGW and the initiator MGW support the codec format, thereby improving compatibility with networks that do not support redundant codec formats. the

The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments. The word "step" described in the above embodiments of the present invention does not represent the order in which the methods are executed in the embodiments. the

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. the

Claims (21)

1. a Session initiation protocol SIP data service signaling negotiation method is characterized in that, this method comprises:

Initiator's SoftSwitch receives from the data service of initiator's media gateway and notifies;

By sending the message carry redundant code/decode format to initiator's media gateway, the code/decode format of initiator's media gateway is revised as described redundant code/decode format;

Send the message of carrying described redundant code/decode format to recipient's SoftSwitch, make recipient's SoftSwitch that the code/decode format of receiving method, medium gateway is revised as described redundant code/decode format.

2. the method for claim 1 is characterized in that, described redundant code/decode format is: the G.711 redundant code/decode format that is used in combination with redundant fashion RFC2198 of code/decode format G.711.

3. the method for claim 1, it is characterized in that, described initiator's SoftSwitch is Invite message or Update message to the message of carrying described redundant code/decode format that recipient's SoftSwitch sends, and SDP wherein comprises redundant code/decode format in describing.

4. method as claimed in claim 3 is characterized in that, described SDP further comprises redundant rank in describing.

5. method as claimed in claim 4 is characterized in that, this method further comprises:

Recipient's SoftSwitch is replied the response of revising the code/decode format success to initiator's SoftSwitch, wherein carries the amended redundant rank of receiving method, medium gateway;

When initiator's SoftSwitch determines that the amended redundant rank of described receiving method, medium gateway and the described SDP redundant rank in describing is inconsistent, the redundant rank of initiator's media gateway is revised as the amended redundant rank of described receiving method, medium gateway.

6. the method for claim 1 is characterized in that, described initiator's SoftSwitch is a Update message to the message of carrying described redundant code/decode format that initiator's media gateway sends, and SDP wherein comprises described redundant code/decode format in describing.

7. the method for claim 1 is characterized in that, described initiator's SoftSwitch sends to recipient's SoftSwitch and further carries other code/decode format that initiator's media gateway is supported in the sip message that carries described redundant code/decode format;

Described initiator's SoftSwitch is after the sip message of described redundant code/decode format is carried in the transmission of recipient's SoftSwitch, and this method further comprises:

Recipient's SoftSwitch determines that the receiving method, medium gateway do not support described redundant code/decode format, and the code/decode format of receiving method, medium gateway is revised as the code/decode format that initiator's media gateway and receiving method, medium gateway are all supported; And return the message of carrying the code/decode format of being revised to initiator's SoftSwitch;

Initiator's SoftSwitch is revised as the amended code/decode format of described receiving method, medium gateway with the code/decode format of initiator's media gateway.

8. the method for claim 1 is characterized in that, described initiator's SoftSwitch is supported the call control protocol BICC with bearer independent, and described recipient's SoftSwitch is supported SIP;

Described initiator's SoftSwitch sends the message of carrying described redundant code/decode format to recipient's SoftSwitch and comprises:

Initiator's SoftSwitch sends BICC message to third party's SoftSwitch, wherein carries the IP Bearer Control Protocol IPBCP that comprises described redundant code/decode format and describes;

Third party's SoftSwitch with described IPBCP describe be converted to SDP and describe after, the code/decode format of third party's media gateway is revised as described redundant code/decode format, and described SDP described is carried in the sip message, be sent to recipient's SoftSwitch.

9. the method for claim 1 is characterized in that, described initiator's SoftSwitch is supported BICC, and described recipient's SoftSwitch is supported SIP;

Described initiator's SoftSwitch sends the message of carrying described redundant code/decode format to recipient's SoftSwitch and comprises:

Described initiator's SoftSwitch sends BICC message to Call Mediation Node, wherein carries the IPBCP that comprises described redundant code/decode format and describes;

Call Mediation Node is carried at described SDP description in the sip message after described IPBCP description is converted to the SDP description, is sent to recipient's SoftSwitch.

10. the method for claim 1 is characterized in that, described initiator's SoftSwitch is supported SIP, and described recipient's SoftSwitch is supported BICC,

Described initiator's SoftSwitch sends the message of carrying described redundant code/decode format to recipient's SoftSwitch and comprises:

Initiator's SoftSwitch sends sip message to third party's SoftSwitch, wherein carries the SDP that comprises described redundant code/decode format and describes;

Third party's SoftSwitch with described SDP describe be converted to IPBCP and describe after, the code/decode format of third party's media gateway is revised as described redundant code/decode format, and described IPBCP described is carried in the BICC message, be sent to recipient's SoftSwitch.

11. the method for claim 1 is characterized in that, described initiator's SoftSwitch is supported SIP, and described recipient's SoftSwitch is supported BICC;

Described initiator's SoftSwitch sends the message of carrying described redundant code/decode format to recipient's SoftSwitch and comprises:

Described initiator's SoftSwitch sends sip message to Call Mediation Node, wherein carries the SDP that comprises described redundant code/decode format and describes;

Call Mediation Node is carried at described IPBCP description in the BICC message after described SDP description is converted to the IPBCP description, is sent to recipient's SoftSwitch.

12. a Session initiation protocol SIP data service signaling negotiation system is characterized in that, this system comprises initiator's SoftSwitch, initiator's media gateway, recipient's SoftSwitch and receiving method, medium gateway,

Described initiator's media gateway is used for sending the data service notice to initiator's SoftSwitch; After the message of carrying redundant code/decode format that receives from described initiator's SoftSwitch, self code/decode format is revised as described redundant code/decode format;

Described initiator's SoftSwitch, be used for after receiving the data service notice of initiator's media gateway transmission, by sending the message carry redundant code/decode format to initiator's media gateway, the code/decode format of initiator's media gateway is revised as redundant code/decode format; Send the message of carrying described redundant code/decode format to recipient's SoftSwitch;

Described recipient's SoftSwitch is used for the message of carrying described redundant code/decode format that sends according to described initiator's SoftSwitch, and the code/decode format of receiving method, medium gateway is revised as described redundant code/decode format;

Described receiving method, medium gateway is used under the control of described recipient's SoftSwitch, and self code/decode format is revised as described redundant code/decode format.

13. system as claimed in claim 12 is characterized in that, described initiator's SoftSwitch further carries other code/decode format that described initiator's media gateway is supported in sending to the message of carrying described redundant code/decode format of recipient's SoftSwitch,

Described recipient's SoftSwitch judges further whether the receiving method, medium gateway supports described redundant code/decode format, be the message that then sends to self, the code/decode format of receiving method, medium gateway is revised as described redundant code/decode format according to initiator's SoftSwitch; Otherwise the code/decode format that selective reception side's media gateway is supported in this message is revised as the code/decode format of described receiving method, medium gateway the code/decode format of described selection.

14. a Session initiation protocol SIP data service signaling negotiation system is characterized in that, this system comprises initiator's SoftSwitch, initiator's media gateway, Call Mediation Node, recipient's SoftSwitch and receiving method, medium gateway,

Described initiator's media gateway is used for sending the data service notice to initiator's SoftSwitch; Under the control of described initiator's SoftSwitch, self code/decode format is revised as redundant code/decode format;

Described initiator's SoftSwitch, be used for the code/decode format of initiator's media gateway is revised as redundant code/decode format, to the call control protocol BICC message of Call Mediation Node transmission, wherein carry the IPBCP that comprises described redundant code/decode format and describe with bearer independent;

Described Call Mediation Node, be used for will comprise the IPBCP of described redundant code/decode format describe be converted to the SDP that comprises described redundant code/decode format and describe after, be carried in the sip message, be sent to described recipient's SoftSwitch;

Described recipient's SoftSwitch is used for describing according to the SDP that comprises described redundant code/decode format that the sip message that described Call Mediation Node sends carries, and the code/decode format of receiving method, medium gateway is revised as described redundant code/decode format;

Described receiving method, medium gateway is used under the control of described recipient's SoftSwitch, and self code/decode format is revised as described redundant code/decode format.

15. Session initiation protocol SIP data service signaling negotiation system, it is characterized in that, this system comprises initiator's SoftSwitch, initiator's media gateway, third party's SoftSwitch, third party's media gateway, recipient's SoftSwitch and receiving method, medium gateway

Described initiator's media gateway is used for sending the data service notice to initiator's SoftSwitch; Under the control of described initiator's SoftSwitch, self code/decode format is revised as redundant code/decode format;

Described initiator's SoftSwitch, be used for the code/decode format of initiator's media gateway is revised as redundant code/decode format, to the call control protocol BICC message of third party's SoftSwitch transmission, wherein carry the IPBCP that comprises described redundant code/decode format and describe with bearer independent;

Described third party's SoftSwitch, be used for will comprise the IPBCP of described redundant code/decode format describe be converted to the SDP that comprises described redundant code/decode format and describe after, be carried in the sip message, be sent to described recipient's SoftSwitch; Send the message of carrying described redundant code/decode format to third party's media gateway, be revised as described redundant code/decode format with code/decode format with third party's media gateway;

Described third party's media gateway is used for after the message of carrying described redundant code/decode format that receives from described third party's SoftSwitch, and self code/decode format is revised as described redundant code/decode format;

Described recipient's SoftSwitch is used for describing according to the SDP that comprises described redundant code/decode format that the sip message that described third party's SoftSwitch sends carries, and the code/decode format of receiving method, medium gateway is revised as described redundant code/decode format;

Described receiving method, medium gateway is used under the control of described recipient's SoftSwitch revising self code/decode format.

16. a Session initiation protocol SIP data service signaling negotiation system is characterized in that, this system comprises initiator's SoftSwitch, initiator's media gateway, Call Mediation Node, recipient's SoftSwitch and receiving method, medium gateway,

Described initiator's media gateway is used for sending the data service notice to initiator's SoftSwitch; Under the control of described initiator's SoftSwitch, self code/decode format is revised as redundant code/decode format;

Described initiator's SoftSwitch is used for the code/decode format of initiator's media gateway is revised as redundant code/decode format, sends sip message to Call Mediation Node, wherein carries the Session Description Protocol SDP that comprises described redundant code/decode format and describes;

Described Call Mediation Node, after the SDP that is used for comprising described redundant code/decode format describes and is converted to the IP Bearer Control Protocol IPBCP that comprises described redundant code/decode format and describes, be carried in the call control protocol BICC message with bearer independent, be sent to described recipient's SoftSwitch;

Described recipient's SoftSwitch is used for describing according to the IPBCP that comprises described redundant code/decode format that the BICC message that described Call Mediation Node sends is carried, and the code/decode format of receiving method, medium gateway is revised as described redundant code/decode format;

Described receiving method, medium gateway is used under the control of described recipient's SoftSwitch, and self code/decode format is revised as described redundant code/decode format.

17. Session initiation protocol SIP data service signaling negotiation system, it is characterized in that, this system comprises initiator's SoftSwitch, initiator's media gateway, third party's SoftSwitch, third party's media gateway, recipient's SoftSwitch and receiving method, medium gateway

Described initiator's media gateway is used for sending the data service notice to initiator's SoftSwitch; Under the control of described initiator's SoftSwitch, self code/decode format is revised as redundant code/decode format;

Described initiator's SoftSwitch is used for the code/decode format of initiator's media gateway is revised as redundant code/decode format, sends sip message to third party's SoftSwitch, wherein carries the Session Description Protocol SDP that comprises described redundant code/decode format and describes;

Described third party's SoftSwitch, after the SDP that is used for comprising described redundant code/decode format describes and is converted to the IP Bearer Control Protocol IPBCP that comprises described redundant code/decode format and describes, be carried in the call control protocol BICC message with bearer independent, be sent to described recipient's SoftSwitch; Send the message of carrying described redundant code/decode format to third party's media gateway, be revised as described redundant code/decode format with code/decode format with third party's media gateway;

Described third party's media gateway is used for after the message of carrying described redundant code/decode format that receives from described third party's SoftSwitch, and self code/decode format is revised as described redundant code/decode format;

Described recipient's SoftSwitch is used for describing according to the IPBCP that comprises described redundant code/decode format that the BICC message that described third party's SoftSwitch sends is carried, and the code/decode format of receiving method, medium gateway is revised as described redundant code/decode format;

Described receiving method, medium gateway is used under the control of described recipient's SoftSwitch, and self code/decode format is revised as described redundant code/decode format.

18. a SoftSwitch is characterized in that this SoftSwitch comprises receiver module, modified module and message transmission module,

Described receiver module is used to receive the data service notice that initiator's media gateway sends;

Described modified module is used for after described receiver module receives data service notice, and the code/decode format of initiator's media gateway is revised as redundant code/decode format;

Described message transmission module is used for sending the sip message or the BICC message of carrying redundant code/decode format to recipient's SoftSwitch or third party's SoftSwitch.

19. a SoftSwitch is characterized in that, this SoftSwitch comprises: message sink module, modified module and respond module,

Described message sink module is used to receive sip message that carries redundant code/decode format or BICC message from initiator's SoftSwitch or third party's SoftSwitch;

Described modified module is used for the sip message or the BICC message that receive according to described message sink module, and the code/decode format of receiving method, medium gateway is revised as described redundant code/decode format;

Described respond module is used for sending the response message that carries described redundant code/decode format to initiator's SoftSwitch or third party's SoftSwitch after described modified module is revised the encoding and decoding success of receiving method, medium gateway.

20. a SoftSwitch is characterized in that, this SoftSwitch comprises BICC receiver module, modular converter and SIP sending module,

Described BICC receiver module is used to receive the call control protocol BICC message with bearer independent, wherein carries the IP Bearer Control Protocol IPBCP that comprises redundant code/decode format and describes;

Described modular converter, the IPBCP that is used for that described BICC receiver module is received describes the Session Description Protocol SDP that is converted to based on SIP and describes;

Described SIP sending module, the SDP that is used for that modular converter is converted to describes and is carried at sip message, sends.

21. a SoftSwitch is characterized in that, this SoftSwitch comprises SIP receiver module, modular converter and BICC sending module,

Described SIP receiver module is used to receive Session initiation protocol SIP message, wherein carries the Session Description Protocol SDP that comprises redundant code/decode format and describes;

Described modular converter, the SDP that is used for that described SIP receiver module is received are described the IP Bearer Control Protocol IPBCP that is converted to based on the call control protocol BICC of bearer independent and are described;

Described BICC sending module, the IPBCP that is used for that described modular converter is converted to describes and is carried at BICC message, sends.

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