Description

Some IVR systems may need DTMF events signalled via SIP INFO messages which can be enabled here.

  • 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.


Web User Interface

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


Phone User Interface

N/A


Auto-provisioning

ParameterValid value
<user_dtmf_info idx="INDEX" perm="PERMISSIONFLAG">VALIDVALUE</user_dtmf_info>
  • on
  • sip_info_only
  • off