3 Protocol Details
The RTP/RTCP: DTMF Digits, Telephony Tones, and Telephony Signals Extensions protocol conforms more to the "sender-receiver" paradigm than the classic "client-server" paradigm. More specifically, it is appropriate to discuss in terms of the receiver of the telephony signals and the sender of the telephony signals.
This specification covers the common details between the sender and receiver. It then provides the specifics of the sender and receiver details.