APPENDIX D. Supported DTMF methods

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PortaSIP supports the following DTMF methods:

  • Inband (as normal audio tones in the RTP stream with no special coding or markers).
  • RFC 2833 (as named telephone events in the RTP stream).
  • SIP INFO method – this is the preferred DTMF method.

Please note that to use these DTMF methods they must be enabled on the Configuration server web interface.

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