Bosnia and Herzegovina

SIP DTMF Signalling

January 3, 2014

dtmfThere are 3 common ways of sending DTMF on SIP calls

  • SIP INFO packets
  • As specially marked events in the RTP stream – see: RFC 2833
  • inband as normal audio tones in the RTP stream with no special coding or markers

In sip.conf file in asterisk settings write dmtf=info and don’t forget to set this option also on your VoIP client