DTMF-Method

Depending on the requirements, it may not be sufficient to transmit "inband" DTMF tones if a SIP receiver cannot recognize these. In this case, it is possible to configure an alternative method of DTMF transmission for All-IP connections.

SNMP ID:
2.33.4.1.1.27 
Console path:
Setup > Voice-Call-Manager > Lines > SIP-Provider > Line
Possible values:
Inband
The tones are transmitted as DTMF tones (G.711) in the RTP (voice) stream.
SIP-INFO
The DTMF tones are transmitted "out-of-band" as a SIP-info message with the parameters Signal and Duration (as per RFC 2976). There is no parallel transmission of G.711 tones.
RTP-Event
The DTMF tones are transmitted as specially marked events within the RTP stream (as per RFC 4733). There is no parallel transmission of G.711 tones. If the call-initialization SDP message does not include telephone-event signaling, negotiations fallback to inband transfer as per G.711.
RTP-Event/SIP-Info
The DTMF tones are transmitted as specially marked events within the RTP stream (as per RFC 4733). There is no parallel transmission of G.711 tones. If the call-initialization SDP message does not include telephone-event signaling, negotiations fallback to transfer as per SIP-Info message.
Default:
RTP-Event

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