hopefully someone is able to help me with mty strange issue, currently i have an asterisk server version, i can terminate a sip number, call the sip number and interact with our services(DTMF Input, outbound calls)

i am now trying to configure some internal SIP phones but asterisk does not see DTMF input and i cant even begin to think what might be causing the issue.

i can see an extension but and register phones(hard and soft) using sip but DTMF from ever doesnt work

any hints would be greatly appreciated

DTMF settings need to be the same on SIP Phone and it’s SIP account settings in sip.conf.

Play arround with the DTMF settings. You can try:

  • InBand
  • RFC2833
  • SIP Info

Usually RFC2833 works best.