I want to write an RTP (Real-time Protocol) player in C++. The application reads in audio (RTP) packets generated by Cisco Voip phones. It then creates an audio (*.au or *.wav) file, and dump audio stream into this file.
I know the format of RTP packet header but don't understand much about RTP payload and how audio stream is encoded (in G.711 format) in RTP packets payload.
Can someone help or show me where to look for more information about RTP packet payload ?