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AT&T is the SIP trunk provider.

It is a local server. The issue appears to be for external calls since I am able to call internal extension and make external calls without an issue. The SIP trunk provider is AT&T with 16 simultaneous calls. IVR is used extensively to route calls. As mentioned IVR recognizes options/DTMF on...

We upgraded from V14 to V15.5, now IVR responses / DTMF are not being recognized by the system!

Craig, It works internally without an issue!

Craig, Please pardon my ignorance, but how does one call the IVR internally? I have always accessed it from the main number?

Hi Craig, Yes, all routers have been restarted since reinstatement of the services! Believe me, I have been in this situation for over a week now! I can use all the help I can get!

Hi Craig, YES I have rebooted the application and the server many many time to no avail! No changes have been made to 3CX or anything on our side of the AT&T's router. Last week, AT&T had disconnected the circuits due to a financial dispute. All issues started once the reinstated the SIP...

Here is the screenshot from wireshark with rtpevent filter. It appears that most of the transmission carried Inband DTMF are being ignored! What's the next step?

I ran wireshark on the PBX with rtpevent filter. I did not see any DTFMs in the captured log! Am I looking at it correctly? Would you be able to take a look at the log for me?

We have AT&T IPFLEX running on 3CX V14 Service Pack 3. Since last week incoming calls are answered by IVR but intermittently the IVR inputs/options are not recognized. Any idea what is going on?