From what I have read when setting up IP trunking between two Avaya’s you require a C-LAN card for the signalling and a MedPro for the trunks (Bearers), thus two IP addresses are required for each node. With most other vendors only one IP address is used for a Gateway when setting up IP trunking. The question is can you use IP trunking between an Avaya and another Vendor. If any one has set this up any advice would be appreciated on how to set up the AVAYA.