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  • What kind of DTMF types Snom phones support and how to change them

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Default type

The DTMF type is negotiated during the call setup. By default, the Snom phones use RFC 2833 out-of-band DTMF type. To do this, it sends the following message inside the INVITE message SDP body:


Depending on the abilities of the two parties, "out-of-band (OOB)" is certainly preferable and "in-band" should be used as fallback only.

Changing the DTMF type

You can change the DTMF type as follows: