I have looked on the wiki and only found passing reference
to RFC 4733 in the SRTP section.
RFC4733 = RTP Payload for DTMF Digits, Telephony Tones, and
Telephony Signals.
This obsoletes RFC2833.
http://www.ietf.org/rfc/rfc4733.txt
Richard Lamkin
Mettoni Group UK
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