When doing H.323 linking between an Aastra (BusinessPhone) and Nortel (BCM50), both PABX's need to be setup for the same kind of Network Numbering Plan. The Nortel refers to the NPI/TON plans as the Alias. In the Aastra, it is setup on the Trunk Gateway as it's NPI Alias. Below is the corresponding table, Aastra in black and Nortel in blue:
Unknown/Unknown TEL
Public/Unknown PUB
Private/Unknown PRI
Private/Regional Level 1 UDP
Private/Regional Level 0 (local) CDP
