A media stream processing of VoIP media gateway

摘要

The converged network consisted of PSTN, IP, 2G and 3G-mobile will allow many different communications systems to interoperates so that users will be able to share data and voice services. One of the key elements is the media gateway, which provides conversion of streamed media formats such as voice and manages the transfer of information between the different networks. The VoIP media gateway supports transcodec that converts between speech codecs of each network and can improve the speech quality of intercommunication among different networks. Our VoIP media gateway adopted direct network interface to eliminate bottlenecks between host processor and DSPs and need not use packet processor because DSP is in charge of network interface. This paper described the architecture of converged network applied to VoIP media gateway, the architecture and the functions of media gateway and the DSP's media processing scheme.