'CallManager' won't run on a router - it will use the services of a router.
'CallManager Express' on the other hand, runs only on routers. Anything from a 1761 up to a 3845 can run it for varying numbers of phones. Aside from common hardware components, protocols and purpose the two are very different products.
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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...