Trailfire: DTMF signaling: Disruptive Telephony: Did you know RFC 4733 had replaced/obsoleted RFC 2833 for DTMF signaling in SIP?

http://www.disruptivetelephony.com/2007/11/did-you-know-rf.html

WramblinReck's comments

In a SIP telephony integration, touch tones (DTMF) can be passed using RTP . (Note RTP carries voices and other sounds on a phone call setup with SIP.) See here for a good description.

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