I have an ICS-7750 (ver 2.5), CCM (3.2(2c)), and an MRP 300 (12.2(8)YM). The MRP is set up as an MGCP ASI81 gateway (8 Port FXS and one PRI).
The PRI is solid, but every now and then, the FXS ports return a fust busy when called . When this happens, it affects ALL FXS ports. Shut / no shut on the voice-ports has no affect. Hosts file on CCM has been edited. All FXS endpoints remain registered.
I have not been able to pinpoint the exact conditions that cause this; but when it does happen, there seems to be nothing I can do but wait for the ports to start working again (I've deleted and re-added endpoints, reloaded MRP, etc.).
MGCP debugging does show the calls arriving at the gateway so it is not a call routing issue. Please advise.