Which value should be entered into the “Source” field to prevent toll fraud regardless of origin of the call?

Refer to the exhibit

An ISDN gateway is registered to Expressway-C with a prefix of 9 and/or it has a neighbor zone specified that routes calls starting with a 9

Which value should be entered into the “Source” field to prevent toll fraud regardless of origin of the call?
A . Any
B . Traversal Zone
C . All
D . Neighbor Zone

View Answer

Answer: C