One of your customers, a military contractor, is very concerned about security. The customer needs to be able to provide videoconferencing for H.323 endpoints across the IP telephony network; however, the customer must be able to hide the IP addresses of the H.323 endpoints in the video network. Which three technologies allow the customer to provide these functions? (Choose three.)

A.
A proxy server and a firewall

B.
DNS/WINS

C.
An IP-to-IP Gateway

D.
A directory Gatekeeper

E.
IPCC

F.
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