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Private network access system based on SIP soft phone and method thereof

A soft terminal and private network technology, applied in the field of private network traversal systems, can solve the problems of increasing packet delay and packet loss, and achieve the effect of improving efficiency and ensuring real-time performance.

Inactive Publication Date: 2010-10-13
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The STUN protocol itself does not support symmetric NAT traversal, while the TURN protocol supports symmetric NAT traversal, but its packets need to be forwarded by the TURN server, which will increase the packet delay and the possibility of packet loss

Method used

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  • Private network access system based on SIP soft phone and method thereof
  • Private network access system based on SIP soft phone and method thereof
  • Private network access system based on SIP soft phone and method thereof

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Embodiment Construction

[0039] The method of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments of the present invention.

[0040] The basic idea of ​​the present invention is that because the network environment is extremely complex, simply using a traversal method cannot make SIP signaling and media streams perfectly and effectively traversal. If the combination of STUN protocol and SIP signaling is used alone, SIP signaling and media streams can only penetrate asymmetrical networks. When encountering a symmetric network, a normal connection cannot be established; if the TURN protocol and SIP signaling are used alone In combination, although any type of NAT network can be penetrated, SIP signaling and media streams need to be transferred through the TURN server, which greatly increases the delay of the message and the possibility of packet loss, thus reducing the real-time performance of audio and video. Therefore, in view o...

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Abstract

The invention discloses a private network access system based on a session initiation protocol (SIP) soft phone and a method thereof. The system comprises a private network access module, an SIP user agent module, a Java media framework module and an audio and video codec module. The method comprises the following steps that: SIP signaling is organically blended with an SIP extension protocol, an STUN message and a TURN message; and the SIP signaling adopts the extension protocol to coordinate with an SIP application server for communication, so that the SIP signaling without SDP can access without transmission of the STUN message and the TURN message, and only the SIP signaling with the SDP needs transmission of the STUN message and the TURN message for extraction of effective information in response. The invention can be used for communication when the public network and the private network are maintained accessible, thereby greatly improving the efficiency of communicating parties, ensuring the real-time communication, and realizing the access to the multi-level serial NAT.

Description

technical field [0001] The invention relates to Internet and multimedia communication technology, in particular to a private network traversal system and method based on a session initiation protocol (SIP) soft terminal. Background technique [0002] With the further development and maturity of the next-generation network (NGN) technology, multimedia and data communication services centered on audio and video have shown huge room for growth in the commercial and personal fields. The new multimedia value-added services that provide audio and video have become the fusion point of telecommunication services and Internet applications, so VoIP (VOIP) technology has become a hot research topic. VOIP technology realizes the real-time transmission of multimedia services such as voice, video and data on the IP network [0003] At present, there are two main technical specifications applied to VOIP - the H.323 protocol of the International Telecommunication Union (ITU) and the SIP pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06H04L29/12
Inventor 章洋程渤刘传昌陈俊亮王月
Owner BEIJING UNIV OF POSTS & TELECOMM
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