套件： rtpproxy (1.2.1-2.2ubuntu1)

Relay for Real-time Transport Protocol (RTP) media streams

A high-performance media relay for RTP streams that can work together with SIP Express Router, OpenSER or Sippy B2BUA. Its main use is to support SIP user agents behind NAT, but it can also act as a generic media relay.

The main purpose of RTPproxy is to make the communication between SIP user agents behind NAT(s) (Network Address Translator) possible. Several cases exists when direct end-to-end communication is not possible and RTP streams have to be relayed through another host. The RTPproxy can be used to setup such a relaying host.

Originally created for handling NAT scenarious it can also act as a generic media relay as well as gateway RTP sessions between IPv4 and IPv6 networks. It can also perform number of additional functions, including call recording, playing pre-encoded announcements, real-time stream copying and RTP payload reframing.