I am trying to figure out how to connect these two so extensions can call each other from side to side. Our company runs a dialer called VICIdial that dials through Asterisk for outbound calls and has an Avaya ip406 for all the other phones in the office. We would like to be able to transfer back and forth between asterisk and ip office extensions rather than having to call through to external numbers to get calls from one phone system to the other. I have found walk throughs on how to do this on Avaya systems but I have not seen any specific to the IP406. The one thing that concerns me though is that our ip office uses pots lines on the back and our asterisk server uses an SIP provided. I do think there should be a way to send the traffic through the lan ports on the front of the ip406 though. Anyone done this yet or know how to?