I'm very interested to hear what others have done to filter out and reject incoming SPAM calls. For us, this is a very tricky thing to do considering most of these calls have spoofed numbers & Caller ID info. Simply rejecting certain numbers either at the H323 GW, or CUCM does nothing as they can instantly change the calling number. Rejecting unknown callers is also not an option, as Caller ID is often spoofed or left blank with legitimate callers. I am currently looking into a way to possibly reject multiple call attempts from/to the same number, but not sure if this is possible. Has anyone else had any success in preventing these SPAM calls from reaching their users? Our setup is PRI --> H323 GW --> CUCM --> End User Extension.
