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.
