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Which way is recommended to prevent these calls?

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Your customer reports that they have had unwanted calls routing from their Cisco VCS Expressway to their ISDN gateway. Which way is recommended to prevent these calls?
A. Configure a Registration Deny List on the Cisco VCS Expressway.
B. Configure a Registration Allow List on the Cisco VCS Expressway.
C. Implement a CPL on the Cisco VCS Control.
D. Implement a CPL on the Cisco VCS Expressway.\
Correct Answer: D

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