We have a Cisco CM 4.2 set up in a test enviroment. The Definity V10 is our production system. I can call between the 2 systems extension to exstension, but I get no audio at either end. The calls connect and I get CLID, but no audio. They appear to be using the same codec. I know very little about the Cisco. I followed a procedure to connect to an Avaya S8500 via H.323 from the Cisco website. Any help would be aprreciated. Thanks.