out of the blue - when someone dials into a POTS FXO port on a 3660 gateway they get 2 rings and a fast busy. Plugging a phone into the telco line and it works fine. The FXO module was replaced and the router rebooted to no avail. When looking at the dial peer it seems to send the call onto callmanager using the connection PLAR but seems to be rejected by the Callmanager for some reason. This has always worked in the past.