DTMF events are not being reported

[designedbywill]

Testing out some new code to replace and old TAPI based system since it is no longer supported by Microsoft.
My inital code very similar to your example but the getDTMF() is not returning anything.
Wireshark is showing the RTP events during the call:
RTP EVENT 60 Payload type=RTP Event, DTMF Nine 9

    while call.state == CallState.ANSWERED:
        pressed=call.getDTMF()
        if pressed == '9':
            call.hangup()
        time.sleep(1)

This is running through a Grandstream UCM6202 and tested with both a MicroSIP on the PC running the code and cell phone being called out over a POTS line. All the other functions are running properly.

my program output:

Dialing...
TODO: Add 500 Error on Receiving SIP Response <-- still on your TODO list? ;)
Ringing/Answered
Friday May 20, 2 10 PM, ,Press 9 to hang up. <-- pyttsx and librosa to make voice prompt in correct format
Sending message
Waiting for input or hangup. <-- listening for DTMF 9
.
.
CallState.ENDED <-- finally manually hangup call
Goodbye

[Duvio]

I have the same problem, somehow this function does not work. I was already about to code my own bare-minimum library because of other problems...