System, apparatus and method of media negotiation in network telephone call

Abstract

The invention discloses a media negotiation process in an internet telephone call, the device and the system. The process comprises the first step is that a double party media gateway builds up the calling connection through an internet telephone signaling, chooses voice coding and encoding way through the process of media negotiation, and establishes the bidirectional media stream on the basis of real-time transmission protocol PTR, the second step is that the double party media gateway monitors the network conditions in the call process after established the call, the third step is that whether needed to change coding and decoding is judged according to the network conditions, and the second media negotiation is initiated through the internet telephone signaling and the media negotiation process when the coding and decoding is needed to changed, the opposite terminal media gateway is informed to switch into the coding and encoding format which is chosen for changing the coding and encoding, the home media gateway can also be switched into the coding and encoding format which is chosen after the opposite terminal is switched successfully, and the fourth step is that double parties build up new bidirectional media stream according to the new coding and encoding format to communicate continuously.

Description

technical field [0001] The invention relates to the negotiation of voice media codec schemes between media gateways in Internet telephony (VOIP), in particular to a method for secondary voice media codec negotiation based on a network real-time environment. Background technique [0002] With the development of the Internet, VOIP technology has also been used more and more. Voice codec technology, as the most basic technology in VOIP, has also derived various standards with the development of time to adapt to various network environments of different rates in which the VOIP system is located. In this case, it is necessary to conduct codec negotiation between voice media gateways to select the best coding scheme, which can not only guarantee a certain call quality, but also save network bandwidth as much as possible. [0003] At present, most VOIP systems have the function of negotiating the codec of the media gateway when the call is established. Although this method can se...

AI Technical Summary

Problems solved by technology

During a long call, if the network is congested, packet loss and other damage occurs, if you continue to use the higher-speed voice codec format determined at the beginning of the call, the call quality will be affected in the slightest, and the call will fail in severe cases. continue

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