I made an app. so that two proxy can exchange msg between them using SIP methods like INVITE, MESSAGE and BYE. Now I wanna exchange audio instead of text msg. It requires RTP but I have no coding concept about RTP. If anyone help me with any kind of link or code or tutorial so that I can code RTP with in SIP. I know the audio recording part with "Player" class, just I need RTP. Thanks in advance.