Is it possible to upgrade CallManager Express software to newer version?
We have router 2811 (2811, 256MB RAM, 64MB FLASH) with old CallManager Express 3.3 (IOS version: c2800nm-spservicesk9-mz.124-3g.bin), and needing to connect unsupported new types of phones Cisco 7911, Cisco 7961.
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...