[cisco-voip] Faxing over SIP Trunk

[Nick]

We are having some issues with faxing over a SIP trunk, the setup is Nortel
CS1000 > SIP Trunk > CUCM 6.1. All outbound calls from the CS1000 are routed
to go out of a gateway connected to the CUCM, phone calls are fine but faxes
are working, the calls are getting to the gateway and you hear the fax
machine answer and get fax tone for about a second then it cuts off. The
debug on the gateway shows normal call clearing and no errors.

Does anyone have any experience of this sort of set up? or any useful
troubleshooting tips.
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