This unit has COR & Multicast.  This is the standard unit we sell to all public safety agencies.

COR: Carrier detect circuit for crossbanding function. The option causes the RPT Function to be controlled by a digital busy signal from each radio. Highly recommended for significant improvement in quality of crossbanding. VOX detection comes standard.
 

Multi-Cast (Simulcast): Provides the ability to broadcast on multiple radios simultaneously. This feature may be enabled or disabled by the user.

(Note: Unit is special order)