Method for establishing transparent channel and SIP terminal and SIP server

Abstract

The invention discloses a method for establishing a transparent channel, and an SIP terminal and an SIP server. The method comprises the following steps of: determining a transparent channel mark whena first SIP terminal wants to establish a transparent channel with a second SIP terminal; sending a request for establishing the transparent channel to the SIP server, wherein the request carries both the transparent channel mark and a second SIP terminal mark; adopting the SIP server to transmit the request to the second SIP terminal and preserve the mapping relations between the transparent channel mark and the first SIP terminal mark and also between the transparent channel mark and the second SIP terminal mark; adopting the second SIP terminal to receive the request and return response ofestablishing the transparent channel to the SIP server; utilizing the SIP server to transmit the response to the first SIP terminal; and establishing the transparent channel between the first SIP terminal and the second SIP terminal after the first SIP terminal receives the response. The invention realizes the establishment of a point-to-point transparent channel.

Description

technical field [0001] The invention relates to the technical field of data transmission, in particular to a method for establishing a transparent channel, a SIP terminal and a SIP server. Background technique [0002] In a multimedia network constructed with Session Initiation Protocol (SIP, Session Initiation Protocol), the SIP protocol specifies session control signaling and media transmission processes. But in addition, there are some data transmission requirements other than control signaling and media in multimedia business applications. For example, it is usually necessary to transmit non- SIP signaling is non-media data. At present, the transparent channel is used to undertake the work of transmitting data through the IP network through the serial port of the front-end alarm device and the serial port of the alarm host. [0003] figure 1 A schematic diagram of the transparent channel is given, such as figure 1 As shown by the solid line in , the SIP terminal and t...

AI Technical Summary

Problems solved by technology

[0004] Although the existing technology gives the concept of transparent channel, it does not give the establishment process of transparent channel; in addition, the existing transparent channel is only limited to point-to-point transmission, and in actual networking applications, there will be In the case of multiple front-ends and multiple back-ends communicating with each other, there is currently no solution for transparent channels to achieve multipoint-to-multipoint transmission

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