When is it necessary to include a Cisco Gatekeeper in a Cisco Unified
Customer Voice Portal deployment?

A.
Gatekeepers are not required under any Cisco Unified Customer Voice Portal model

B.
Gatekeepers are required in all Cisco Unified Customer Voice Portal models

C.
When the Cisco Unified Customer Voice Portal Call Control Server is deployed with H.323 calls without dial peers defined in the Cisco Voice Gateways

D.
When the Cisco Unified Customer Voice Portal Call Control Server is deployed with H.323 calls and there is no Cisco Unified Communications Manager as part of the solution