- You upgrade to or install Microsoft Skype for Business Server 2015.
- Your Exchange Unified Messaging (UM) Auto Attendant (AA) contact is hosted on a Skype for Business Enterprise Edition Pool or Standard Edition server.
- An incoming PSTN (external caller) call reaches the UM Auto Attendant and is blind transferred to a Skype for Business user or to an RGS that does not have a dedicated DID number.
Additionally, you may observe the following errors logged in the event log on your Exchange UM server:
To move your Exchange UM contact objects, run the following Move-CsExUmContact cmdlet: