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