My current setup is:
2851 Gateway with a 4 fxo card installed
PBX phone line plugged into port 0/0/0
CCM v 5.1
I can call any internal office number and any off site local or long distance number from my IP Phone through the PBX with no problems but when I try to call an IP Phone say DN 3000 I get one ring then a busy signal.
I tried adding the PLAR 3000 command to voice-port 0/0/0 and that did not help.
I have all my route patterns running on the CCM
I am using MGCP