Observing MATE_UNAVAIL Errors on the PGW2200 for the CICs (Circuit Identification code) E1s connected to the Media Gateway AS5400 series. PGW2200 is configured in Nailed Mode and Interconnected with the Voice Media Gateway for PSTN call routing.
MATE_UNAVAIL - Locally blocked on a nailed-up system due to a media gateway event (for example, a group service message received from the media gateway or the media gateway is out of service). If the associated switch is not responding to group unblock messages, the CICs stay in the MATE_UNAVAIL circuit block state. Your CICs will be in this state when you bring up the Cisco MGC or media gateway. Once the associated switch acknowledges the unblock message, the CICs are taken out of this