The issue would be that the feature that is used to do this is TSP Dial. After upgrading to CM 5.1(2), you need to upgrade the version of TSP Dail as well. Please download and install TSP Dial from https://:8443/plugins/CiscoTSP.exe and install it on the client machines.
Please check the following link for information on configuring TSP
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...