300-820 · Question #181
An engineer is configuring Cisco Expressway-E and needs to implement toll fraud prevention. Which configuration meets this requirement?
The correct answer is B. Enable and configure local call policy. Toll fraud occurs when unauthorized parties use an organization's telephony infrastructure to make expensive calls. On Cisco Expressway-E, Local Call Policy (also known as CPL - Call Policy Language) allows administrators to define rules that permit or deny calls based on…
Question
An engineer is configuring Cisco Expressway-E and needs to implement toll fraud prevention. Which configuration meets this requirement?
Options
- AEnable SIP ALG inspection on the network address translation firewall.
- BEnable and configure local call policy.
- CEnable and configure the Expressway-E firewall.
- DConfigure the external firewall to block specific IPs.
How the community answered
(60 responses)- A2% (1)
- B80% (48)
- C5% (3)
- D13% (8)
Explanation
Toll fraud occurs when unauthorized parties use an organization's telephony infrastructure to make expensive calls. On Cisco Expressway-E, Local Call Policy (also known as CPL - Call Policy Language) allows administrators to define rules that permit or deny calls based on source, destination, time of day, and other parameters. By restricting which call patterns are allowed to traverse the Expressway-E (particularly for calls originating from untrusted external zones), toll fraud can be effectively prevented. External firewalls and NAT/SIP ALG do not have the call-aware logic needed to selectively allow or block calls based on dial patterns. Configuring the Expressway-E's built-in firewall (option C) controls network access, not call routing logic, making it insufficient as a standalone toll fraud control.
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