Hi J,
Perhaps this doc may help (the basic concepts should carry over);
Nortel Communication Server 1000M Release 4.0 using H.323
Trunk to Cisco Unified CallManager Release 4.1(2)
http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/pbx/interop/notes/445274no.pdf
I wish that I had some "first-hand" knowledge for you, but we use DMS100 PRI's
between the Nortel and CUCM
Hope this helps!
Rob