Dial Plan Unknown Dialplan %1 is not recognized by routing application Cause: Dial plan does not exist, or Microsoft Lync ...

Dial Plan Unknown

Dialplan [%1] is not recognized by routing application
Cause: Dial plan does not exist, or Microsoft Lync Server 2010 does not have permission to read the relevant Active Directory objects.
Resolution:
If the dialplan is valid, then run exchucutil.ps1 in appropriate Exchange forest to give permission to Microsoft Lync Server 2010. If the dialplan is not valid, then clean up proxyAddresses attribute for the affected users.