If missed calls are not connecting to Exchange Unified Messaging, you can troubleshoot the issue as follows:
- Verify that Exchange users are enabled for Unified Messaging
and are assigned to a SIP Uniform Resource Identifier (URI) dial
plan that is configured for use with Office Communications Server.
For details, see
How to Enable a User for Unified Messagingat Microsoft
- Verify that the Exchange administrator has installed a
certificate from a certification authority (CA) that is trusted by
both the Exchange Server 2007 servers and the Office Communications
Server 2007 R2 servers.
- Verify that the Exchange administrator has run the
ExchUCutil.ps1utility on Exchange to grant Office
Communications Server permission to read the Exchange directory
attributes in every forest where Exchange Unified Messaging is