The Microsoft Exchange Unified Messaging Service on the Mailbox server has been configured to use the Lync Server A/V Edge ...

The Microsoft Exchange Unified Messaging Service on the Mailbox server has been configured to use the Lync Server A/V Edge server resources associated with '%1'. Inbound and outbound calls involving users not connected to the internal network might be failing using the current Lync Server A/V Edge server resources. Please contact the appropriate administrator and verify that the Lync Server A/V Authentication Service is configured correctly and operational.