VICIPanel
Troubleshooting/DTMF keypresses not registering
MediumNetwork

DTMF keypresses not registering

Callers pressing phone keys don't trigger IVR actions, menus get stuck.

Symptoms

  • •IVR waits for keypress, timeout expires, callback never branches
  • •Different callers (different carriers) have different experiences
  • •Works on some routes, fails on others

Common causes

  • •DTMF mode mismatch between carrier and Asterisk (info vs rfc2833 vs inband)
  • •Audio codec stripping DTMF (some codecs don't support inband tones)
  • •Network packet loss disrupting DTMF transmission

How to fix it

  1. 1
    Check carrier's supported DTMF mode; match it in sip.conf or trunk definition
  2. 2
    Prefer rfc2833 (out-of-band) for reliability
  3. 3
    Test with known-good phone to isolate carrier vs dialplan issue
Network health and operational view in VICIPanel
How VICIPanel helps

VICIPanel's carrier dashboard shows detected DTMF mode per trunk and flags mismatches between configured and actual behavior.

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