AREA 188 ( AREA188 )

area188 rtpWhat your VoIP provider uses for RTP does not need to be part of what IOS supports. Example, let say your ISP want to receive RTP on port 6001. The router will justRTP has a broad range of ports assned 16384 - 32767 UDP. However different vendors use different ports (e.g. CUCM uses only a number 24576-32767UDP) hence