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

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