The programming is basically the same as the SV8100/SV9100 systems - so do some searching as it's probably been covered in previous threads.
It's really easy to do if you're familiar with both systems. Setup the trunks with IP authentication and use F-Routes (NEC side) and shortcodes (IP Office side) to enable direct extension calling between the systems.
I have SIP trunks between my IP Office and NEC SV9100 systems and it works just fine.
I have already programmed for the AVAYA (IP Office side), calls are going through already. However, calls from NEC to IP Office does not go through. I only get a busy tone from NEC side. I have programmed already SIP on the NEC Side.
Here is the list of programming for the SIP on NEC based on this link
You need to run system monitor to see what is coming into the IP Office on the SIP trunk. That may show why the IP Office isn't accepting and routing the calls.
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