Asterisk does not recognise DTMF tones from mobile phones

Posted by Eugene van der Merwe on Server Fault See other posts from Server Fault or by Eugene van der Merwe
Published on 2012-07-06T07:44:25Z Indexed on 2012/07/06 9:17 UTC
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asterisk

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?

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