Method and device for establishing SIP (Session Initiation Protocol) session

Abstract

The invention aims to provide a method and a device for establishing an SIP (Session Initiation Protocol) session; the method comprises the following steps: after an application server receives a session establishment request from CSCF (Call Session Control Function), sending the session establishment request to the CSCF, wherein an unsatisfied caller media type set and a replied called terminal set are included; when receiving a reply message from the CSCF, updating the unsatisfied caller media type set and the replied called terminal set; and repeating above process till the unsatisfied caller media type set is empty or the application server receives an indication message from the CSCF, wherein the indication message is used for indicating that all called terminals are replied. By adopting the method and the device disclosed by the invention, one SIP terminal can establish the SIP session with multiple SIP terminals, so that the success rate of establishing the SIP session is improved; and meanwhile, the media type of the SIP session can be increased, and the user experience is obviously improved.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a technology for establishing a SIP session. Background technique [0002] A SIP (Session Initial Protocol, Session Initiation Protocol) message is a signaling message used to establish an end-to-end session (Session). Usually, SDP (SessionDescriptionProtocol, Session Description Protocol) information is encapsulated in the message body part of the SIP message. These SDP information indicate the media type supported by one end of the session. These media types include but are not limited to audio, video, message, FTP, etc. (FileTransferProtocol, file transfer protocol), etc. Since the SIP message is an end-to-end session message, the current SIP session can only be established between one terminal and another terminal, but not between one terminal and multiple terminals. Moreover, the media type specified in SDP It is for a certain terminal. [0003] With the rapid devel...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is: when each called terminal cannot meet the media type specified by the calling terminal, even if the media types of all called terminals together can meet the calling terminal, but because the calling terminal requires When all the specified media types are satisfied, the call cannot be established

For example, in the above example, if the media type specified by the SDP in the SIP call request initiated by the calling terminal A1 is audio and FTP, and the called terminal B1 answers first, the called terminal B1 is connected to the session, and the calling terminal A1 can only establish an audio connection with the called terminal B1, but the FTP required by the calling terminal A1 cannot be satisfied

[0007] It can be seen that there are problems in the prior art that a SIP call cannot be established successfully or can only partially meet user needs. The main reason for these problems is that in a SIP session in the prior art, one terminal can only be connected to another terminal , but cannot connect with multiple terminals

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