300-820 · Question #120
An engineer reviews the configuration of a pair of Expressway servers for a company with the domain example.com. The company allows toll fraud calls to reach the Cisco UCM only when it expects…
The correct answer is D. CPL to block calls with a destination URI with 8 or more digits on the Expressway-E. Call Policy Language (CPL) on the Expressway-E allows the creation of logic-based rules that block or reject calls before they enter the internal network. Since fraudulent calls share a common trait-8 or more destination digits-a CPL rule blocking those calls at the…
Question
An engineer reviews the configuration of a pair of Expressway servers for a company with the domain example.com. The company allows toll fraud calls to reach the Cisco UCM only when it expects externally registered devices to call internal 5-digit extensions. The search history shows that the fraudulent calls have a destination URI of 8 or more digits and several domains. What must the engineer configure to prevent all toll fraud calls from going past the Expressway-E to the internal network?
Options
- Asearch rules to only route calls with a destination URI of 5 to 8 digits long on the Expressway-E
- BCPL that blocks calls with a destination domain other than example.com on the Expressway-C.
- Csearch rules to only route calls with a destination domain of example.com on the Expressway-E
- DCPL to block calls with a destination URI with 8 or more digits on the Expressway-E
How the community answered
(28 responses)- A18% (5)
- B11% (3)
- C4% (1)
- D68% (19)
Explanation
Call Policy Language (CPL) on the Expressway-E allows the creation of logic-based rules that block or reject calls before they enter the internal network. Since fraudulent calls share a common trait-8 or more destination digits-a CPL rule blocking those calls at the Expressway-E is the most targeted and effective fix. Applying this at the Expressway-E (the internet-facing edge) stops fraud at the perimeter. Search rules targeting domain alone (option C) would fail against calls using valid domains but excessive digit URIs.
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