We do not support integration with third party call control. "No support" means TAC won't take cases, but this type of interoperability is almost certainly going to work. Cisco IOS and Nortel integration has been tested internally with positive results.
You will require CLI into the UC500 more than likely, although you could start by defining the Nortel PBX as a Generic SIP trunk using CCA. Good luck.
Yeah, I do understand that I wouldn't get any official documentation on how to setup this, just wanted to know if it had been tested somewhere and it worked. Knowing that saves me a lot of time in the case it would have been tested and found not working
In that case I will start testing things and yeah I was prepared to do some CLI tweaking.
In the long run, the client will switch to some Cisco equipment, we have already switched 3 of their 4 branch offices to UC520, but the main office will be more complicated.
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