Have a module WS-X6608-E1 which install in C6509 with CatOS version 7.3(1). Been confugyre with CUCM 7.1.3 and it work fine, which IP Phone can make in/out call. Question here is how to do debug in CatOS to verify isdn dial in/out number ? or have any similar command like "debug isdn Q931" to verify ? Pls advice. Thanks.