300-820 · Question #119
Cisco Collaboration deployment has video endpoints that can do B2B calls over the internet, but they also can make audio calls through a gateway. This ability means that someone from the internet…
The correct answer is B. Avoid using any wild card in the source settings in the search rules. In Cisco Expressway, search rules include a 'Source' field that restricts which zone a call must come from to trigger that rule. If a wildcard is used in the source field, calls from ANY zone-including untrusted external zones-can match the rule and be routed to the PSTN…
Question
Cisco Collaboration deployment has video endpoints that can do B2B calls over the internet, but they also can make audio calls through a gateway. This ability means that someone from the internet can make fraud calls through the system. Which action must an engineer take to set up the search rules for calls that are being headed to the PSTN gateway?
Options
- AEnsure that only requests that are authenticated are allowed to make a PSTN call.
- BAvoid using any wild card in the source settings in the search rules.
- CAdd registered devices only in the search rule for the PSTN gateway.
- DAdd registered devices only in the zone for the PSTN gateway.
How the community answered
(50 responses)- A12% (6)
- B78% (39)
- C8% (4)
- D2% (1)
Explanation
In Cisco Expressway, search rules include a 'Source' field that restricts which zone a call must come from to trigger that rule. If a wildcard is used in the source field, calls from ANY zone-including untrusted external zones-can match the rule and be routed to the PSTN gateway, enabling toll fraud. By specifying an explicit, restricted source zone (e.g., only internally registered devices), the engineer ensures external callers cannot exploit the PSTN route.
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