You can set the DivaDTMFMode parameter: DTMF Mode Description DivaDtmfModeAuto Uses the automatic negotiation of the DTMF mode. The options RFC 2833 and inband are enabled. Based on the negotiation with the peer, RFC2833 or inband is used. If DTMF cannot be sent via RFC2833 or inband, then SIP info messages are used. Received DTMF are signaled to the application independent from the way they are received. DivaDtmfModeRFC2833 Use RFC2833 if supported by the remote peer. An implicit fallback to inband DTMF mode is done if RFC2833 is not supported by the remote peer. DivaDtmfModeSIPInfo Only valid for transmitted DTMF tones. If this mode is set, DTMF chars are sent via SIP info messages. RFC2833 is not enabled. DivaDtmfModeRFC2833SIPInfo Use RFC2833 if supported by the remote peer. If DTMF tones cannot be transmitted via RFC2833, SIP Info messages are used. Incoming DTMF tones may be signaled as RFC2833, inband, or SIP Info, depending on the remote peer. Refer to the SDK documentation for additional information.
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