According to Cisco documentation the cause code breaks down as follows:
The first two digits (82) mean that the message is coming from the local telco switch. The last two digits (AC) means: The remote equipment cannot provide the channel that the user requests, due to an unknown reason. This problem is usually temporary.
From the debug you posted it looks like the calling number is 507316 and the called number was 008. The number 008 is not really a number that the PSTN would be able to route so I'm not sure why someone would have dialed that number. Is the debug from an outbound call or an inbound call?
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...