What happens if Session Manager cannot find a matching SIP Communication Profile for a user...

The call is sent to Communication Manager to check if the number dialed exists in CM’s call routing tables.

The caller receives a busy tone.

Network Routing Policy (NRP) is consulted for further routing instructions.

The call is routed to voicemail to check if the extension is associated with a mailbox.

Session Manager attempts to create a new SIP Communication Profile for the user.