You can troubleshoot such an issue by following the below cases/examples. But there may be cases where you find the PBX not detecting the DTMF digits. The default Vodia PBX installation takes care of most of the DTMF detection cases. Note that the actual payload type and the format specific parameters can be different from above a=rtpmap:101 telephone-event/8000 line in the incoming SDP.Support for such feature is indicated by. Generally, this feature is negotiated in the SDP as part of the SIP signaling. Most of the modern VoIP systems/devices support RFC4733(obsoletes RFC2833) RTP events. When an incoming call arrives at the Vodia PBX, caller may be prompted to press some digits to reach the final destination.
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