What version of Unity and what version of Exchange? Did this ever work correctly? Is Exchange installed on the Unity server also and if so is Unity pointing at that local Exchange server? Is the message delay only for external callers or internal (other Unity subscribers) callers or is it both? During the delay do all subscriber experience it or is a just a few subscribers? If it is just a few is it always the same few? Can the subscriber sign in to the mailbox OK or are they told by Unity that the Exchange server is down? Are you getting any errors in the event log?
All messages from non-Unity subscribers (outside callers) will pass through the UMR before they are delivered to Exchange. You want to check in that folder to see if messages are stacking up during the delay. It is located at \commserver\UnityMTA. From the UMR, Unity will create message in the out box of the Unity_Servername mailbox via MAPI which Exchange immediately send to the addressed party.
If the messages have been clear from the UMR and submitted to the Unity_Servername mailbox Unity is out of the picture and there might be an issue with the customers Exchange server(s). If the Unity_Servername mailbox is on a different Exchange server from the customers Exchange server they may have an issue between the two or more Exchange servers that needs to be resolved.
Messages from other Unity subscribers don't go through the UMR. Unity creates a message on behalf of the subscriber in the out box of their Exchange mailbox via MAPI which Exchange immediately sends to the addressed party.
If Unity can’t connect to an Exchange server it will log AvExchangeMonitor_MC warning messages to the event log. Messages are logged when Unity loses access and then again when Unity regains it.
Keith
Keith Chambers
Diagnostic Engineer
Voice Network Team, San Jose
Cisco Systems, Inc.
