What happens if all CTI ports for the configured Cisco Unified Communications Manager Telephony Group are busy when a new call arrives?

A.
The caller will receive network busy treatment.

B.
The caller will receive ringing treatment.

C.
Cisco Unified Communications Manager will forward the call to the directory number configured for forward-on busy for this CTI Route Point in Cisco Unified Communications Manager.

D.
An exception is raised, but the call is accepted and processed.

E.
Cisco Unified Communications Manager will forward the caller to the directory number configured in Cisco Unified CCX for overflow.

Explanation: