Asterisk does not recognise DTMF tones from mobile phones
- by Eugene van der Merwe
We have an Asterisk 1.8.7.0 (the Elastix derivative) switchboard.
Every since a month ago, seemingly out of the blue, the switchboard does not recognise DTMF tones any more from mobile phones.
Testing the switchboard using 7777 works.
Testing the switchboard from a normal phones works.
Testing the switchboard from a mobile phone fails.
Looking at the log file I can't see anything. I used 'asterisk -rvvvv' and 'tail -f /var/log/asterisk/full' to see the live output and scan the logs. I guess I don't see anything because it's simply not recognising the DTMF tones.
I did brief research and found an old setting for SIP phones, 'rfc2833compensate=yes', and tried adding this to 'sip_general_custom.conf'. After that I did 'core restart when convenient' but that didn't make any difference.
Could anyone give me some additional troubleshooting steps?