DTMF problems
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DTMF digits are skipped
DTMF is handled by Asterisk. If some digits are missing - that means that your Provider is not delivering DTMF codes correctly.
Possible steps to fix situation:
1. Change DTMF type to RFC2833 (if it is other type) 2. in /etc/asterisk/sip.conf set relaxdtmf=yes and reload Asterisk 3. Change Provider