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300-820 · Question #16

Which role does Call Policy play when preventing toll fraud on Expressways?

The correct answer is A. It controls which calls are allowed, which calls are rejected, and which calls are redirected to a. Call Policy on Expressway acts as an access control mechanism to permit, reject, or redirect calls, which is the primary tool for preventing toll fraud.

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Question

Which role does Call Policy play when preventing toll fraud on Expressways?

Options

  • AIt controls which calls are allowed, which calls are rejected, and which calls are redirected to a
  • BIt changes the calling and called number on a call.
  • CIt changes the audio protocol used by a call through Expressways.
  • DIt changes the audio codec used in a call through Expressways.

How the community answered

(39 responses)
  • A
    92% (36)
  • B
    5% (2)
  • C
    3% (1)

Why each option

Call Policy on Expressway acts as an access control mechanism to permit, reject, or redirect calls, which is the primary tool for preventing toll fraud.

AIt controls which calls are allowed, which calls are rejected, and which calls are redirected to aCorrect

Call Policy on Expressway uses CPL (Call Processing Language) rules to evaluate incoming and outgoing call requests and make decisions to allow, block, or redirect them. By restricting which source-destination call patterns are permitted, administrators can prevent unauthorized parties from using the Expressway as a relay for expensive PSTN calls, directly mitigating toll fraud.

BIt changes the calling and called number on a call.

Modifying calling and called numbers is the function of transforms and search rules, not Call Policy.

CIt changes the audio protocol used by a call through Expressways.

Changing the audio protocol of a call is not a function of Call Policy; protocol selection is governed by zone configurations and endpoint capabilities.

DIt changes the audio codec used in a call through Expressways.

Codec selection is negotiated between endpoints during call setup and is not controlled by Call Policy on Expressway.

Concept tested: Expressway Call Policy for toll fraud prevention

Source: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X12-5/exwy_b_cisco-expressway-administrator-guide/exwy_b_cisco-expressway-administrator-guide_chapter_01101.html

Topics

#Expressway Call Policy#Toll Fraud Prevention#Call Control#Expressway Security

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