Release 4.0 supports "standard" SIP trunking - releases 3.6 and 3.7 were BCM to BCM only and didn't meet true SIP standards. You could try it if you're on 3.6 or 3.7, but I think you'd be wasting time - even Nortel admitted it was a futile effort at best to do SIP on 3.6/3.7.
I think the problem is, SIP endpoints need to "see" each other directly. It works fine within the same subnet on a switched-only network. Routing between subnets causes a problem. This is a problem with SIP, not with Nortel hardware.
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