The Intercom Calls services is not a corporate directory. It is a call log similar to the Placed Calls and Received Calls services.
Setting the Enterprise Subscription parameter to true is uncommon as this would subscribe every phone in the cluster to it. I would recommend you subscribe the service from the Device Configuration page using the Subscribe/Unsubscribe Services Related Tasks link.
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...