I have a UC-520 which has be in operation for over a year. Over the weekend the system can no longer be accessed via the vlan1 interface IP. This has resulted in not being able to access the service provider (SIP). I can connect via console and reviewed the configuration which seems to be correct. All of the phones can connect and obtain IP and configuration. I can make calls between internal phones but nothing in or out of the network.
I cannot access the system via telnet, CCA, browser, only console cable. I have attempted to access it on the default 192.168.10.1 address but no luck there either. The system has 12.4 software. There were power issues over the weekend but the UC-520 is connected to an UPS and the Catalyst switch which is in the same rack is fine.
I am at a loss as to how to troubleshoot this and would welcome any suggestions.