DTMF Not Working On Incoming Calls

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    What is  the best way to debug DTMF on a PJSIP trunk?  I have cycled through all available options
(‘rfc4733′,’inband’,’info’,’auto’,’auto_info’) but my IVR does not recognize any options from the remote end. I have also tried changing codecs from g729 to alaw or ulaw with the same result.  Outgoing calls do not seem to have this problem, just incoming.  This is with Asterisk
13.29.2 but the problem started with 13.21 before I decided to upgrade to the latest 13.x version.  Any pointers?

One thought on - DTMF Not Working On Incoming Calls

  • Have you done a wireshark capture and then seen if the DTMF is coming in from your provider? What does the SDP show?