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Web User Interface

Setup → Identities → SIP Settings (Section): DTMF via SIP INFO 

Phone User Interface

N/A

XML Configuration

<user_dtmf_info idx="INDEX" perm="PERMISSIONFLAG">VALIDVALUE</user_dtmf_info>

Description

Some IVR systems may need DTMF events signalled via SIP INFO messages which can be enabled here. As of firmware version 7.1.33 there are three options for providing DTMF codes. 

  • Option <off> is the default. The DTMF type is negotiated during the call setup. By default, the phone uses RFC 2833 out-of-band DTMF.
  • Option <on> enables sending DTMF codes via SIP INFO messages and in-band or out-of-band DTMF via RTP. 
  • Option <sip_info_only> enables sending DTMF codes via SIP INFO messages only.


If you want to force the use of in-band DTMF, you must remove the value telephone-event from the <codec_priority_list> of the according SIP identity. See also FAQ "What kind of DTMF types Snom phones support and how to change them" for more information.

Valid Values

  • on
  • sip_info_only
  • off

Default Value

  • off