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 correct answer is B. Any. When configuring search rules or call policy on Cisco Expressway to prevent toll fraud for an ISDN gateway, setting the Source field to 'Any' ensures the rule applies regardless of where the call originates - whether from a traversal zone, neighbor zone, default zone, or any…

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Question

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?

Exhibit

Options

ATraversal Zone
BAny
CNeighbor Zone
DAll

How the community answered

(17 responses)

A
6% (1)
B
94% (16)

Explanation

When configuring search rules or call policy on Cisco Expressway to prevent toll fraud for an ISDN gateway, setting the Source field to 'Any' ensures the rule applies regardless of where the call originates - whether from a traversal zone, neighbor zone, default zone, or any other source. This is critical because toll fraud often exploits rules that only restrict calls from specific zones, allowing attackers to spoof or route calls through unexpected paths. Using 'Any' closes all such loopholes by applying the restriction universally. Options A, C, and D (Traversal Zone, Neighbor Zone, All) are either zone-specific or are not valid Expressway source field values that achieve universal coverage.

Topics

#Expressway Security#Toll Fraud#Call Routing Rules#Source Matching

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