I have a client using a SIP Fax machine (Ricoh MFD) registered with CUCM 10.5 and the machine/extension is able to receive external calls/faxes fine. It is when he tries to make and outbound call that they fail.
If the the MFD is powered off and the extension/account registered with on a 3CX softphone, the outbound calls work fine without any issues.
I collected the debugs on GW and in the SDP noticed that for the working call, both PCMA and PCMU were being negotiated, while for the non-working call, only PCMU was being negotiated:-
o=CiscoSystemsCCM-SIP 179406599 1 IN IP4 10.252.128.130
c=IN IP4 10.107.228.147
m=audio 40016 RTP/AVP 0 8 3 101
a=rtpmap:8 PCMA/8000 >>>>>>>>>> working in this case
o=CiscoSystemsCCM-SIP 179319315 1 IN IP4 10.252.128.130
c=IN IP4 10.252.255.162
m=audio 30002 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000 >>>>>>>>>> not working in this case
The configurations on CUCM also appear fine and the fact that calls for the same settings via a softphone work but not for the Ricoh MFD, makes me suspect whether it is the Ricoh MFD which supports PCMA or not.
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