What is the first step to configure this feature?

AN engineer is implementing toll fraud prevention for incoming calls cluster-wide on cisco UCM.

What is the first step to configure this feature?
A . Set service parameter ‘Block OffNet to OffNet Transfer’ to False
B . Configure blocking for inbound calls based on caller I
D . Set service parameter "System Remote Access Blocked Numbers’ to True
E . Set service parameter ‘Block OffNet To OffNet Transfer’ to True

View Answer

Answer: A