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https://www.voipmechanic.com/dtmf-issues.htm
An issue with some Asterisk versions (1.4) and DTMF. Setting rtpkeepalive enabled blocks/mutes DTMF which is caused by the transmission of comfort noise, which in effect cancels the sending of DTMF. To resolve this issue set rtpkeepalive=0.
https://sites.google.com/site/voipnotes/vop/asterisk-dtmf
Asterisk and DTMF (TouchTone) Asterisk provides support to convert signalling methods (Inband, Out-of-band) to DTMF tones. Inband In telecommunications, in-band signaling is the sending of metadata...
http://forums.asterisk.org/viewtopic.php?t=92539
Feb 23, 2015 · Asterisk doesn't FFT. Tone decoding is ONLY done for inband. For other schemes, the tones are already decoded to digits. GSM codecs are incompatible with DTMF, so DTMF tones never come from the phone in GSM networks; they come from the basestation, or a mobile switching centre.
https://www.experts-exchange.com/questions/27110045/Asterisk-DTMF-mode.html
Can't you try other settings for dtmf-relay? I would be suspicious of a value called sip-notify because the SIP protocol does include NOTIFY requests which are different to INFO requests. However, Asterisk does not support receipt of dtmf via NOTIFY messages, only via INFO messages.
https://www.asteriskguru.com/tutorials/senddtmf.html
Asterisk Guru Website. So, we have registered the users anatoliy, user1 and user2. Type=friend means that this user can make and receive calls.Host=dynamic means that the IP is not static but dynamic through a DHCP server.Allow=all means that the line which this user will use, could support all audio codecs.Context=test - this shows that this user is working with the extensions in this context ...
https://community.freepbx.org/t/dtmf-inband/5374
dtmf=inband. Anyone have any suggestions what to try? I ran across a post at one point talking about adjusting the timing that * uses for the length of the tone, but I can’t find that again, and am starting to wonder if I imagined it. 711 is the only protocol supported by the softswitch.
https://www.asterisk.org/get-started/features
Asterisk offers the advanced features that are often associated with large, high end (and high cost) proprietary PBXs. The list below includes a sample of the features available in Asterisk. See the Asterisk Glossary for a list of terms.
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