I've got a 2821 router with an ISDN-30 running as a H.323 gateway. I have no issues with incoming calls where the destination extension is busy - I get busy tone as expected.
But, I have a 3rd party (Call Centre) application that is registering as a CTI route point. I have a translation pattern within CM pointing to this route point. When the 3rd party app gives busy tone, calls from internal extensions correctly get busy tone. However, external callers are getting disconnected (they just hear a long continuous tone, the type you hear when you're diconnected or there is a fault etc.)
When the 3rd party app is NOT giving busy tone and accepting calls, they are connected without any problems.
The problem is, I need to ensure external callers get the busy tone. I guess this is something to do with signalling / disconnect codes but I'm assuming this is a problem with CM vs 3rd party app rather than gateway vs ISDN ?
Any ideas ?