There's some good MWI tech notes you should probably start with - if those don't help, let us know and provide some more details about what's not working (i.e. is it intermitent, only for some users, stops working after a while, never works etc...). There are three tech tips on MWI issues in general which you can get here:
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...
If you have 2 ISR routers, one acting as Failover, do we need to have both the same number of SRST licenses on the 2 routers?
No. You will only need the SRST licenses on the primary router. Because this feature...