Good day.
We connect a PRI line through a Patton 4960 which trunks to PBXnSIP. For the fax to mail we enable unified messaging on our exchange 2007, with the client's telephone number on PBXnSIP.
Normally the fax will come in and be delivered to the corresponding mailbox. This stopped working about two days ago. I can see the call coming in and connecting to the patton, and it does reach the pbx server. When checking the sip trace I can see it comes in on G711u but then switches’ to G729, which is causing the fax to fail. Both the trunk and extension is configured to use G711U.
We also use the same PRI line to register accounts on Audiocodes MP202's and send and receive faxes through that without any problems, so the PRI line is working fine.
Attached is a copy of the sip trace.
Any idea's
Thanks
siptrace.txt