An administrator is asked to implement toll fraud prevention in Cisco UCM, specifically to restrict off-net to off-net call transfers How is this implemented?

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An administrator is asked to implement toll fraud prevention in Cisco UCM, specifically to restrict off-net to off-net call transfers How is this implemented?
A . Implement time-of-day routing.
B . Use the correct route filters.
C . Set the appropriate service parameter
D . Enforce ad-hoc conference restrictions

Answer: C