When accessing the auto attendant of an external organizations voice mail system, the caller input is not recognized. Tested using a a different ip phone and it works with no problem.
if it fails for PSTN calls check your DTMF settings as you might not be passing them to Unity
if this helps, please rate
WHERE/what setting would you check for DTMF? Dial Peers? DTMF Signalling method on SIP trunk? MTP Telephony Event Payload Type? Furthering your suggestion would be helpful.
first place to check is the dial-peers, or MGCP config depending on what protocol you're running
I know, this topic is old, however I did not found an aswer for this topic and I hope that my answer can help someone.
I Fix this problem using the below command under the dial-peer within the UC as destination:
=> dtmf-relay cisco-rtp rtp-nte digit-drop h245-signal h245-alphanumeric
Would be nice if someone can explain each one of the options above, anyway, this I'll fix the keypad input problem!