Which statement is true when H.323 and SIP interworking is set to on in the Cisco TelePresence VCS?
A. The Cisco TelePresence VCS will act as a SIP-to-H.323 gateway regardless of whether one of the endpoints is locally registered.
B. The Cisco TelePresence VCS will act as a SIP-to-H.323 gateway only if one of the endpoints is locally registered.
C. The Cisco TelePresence VCS will not act as a SIP-to-H.323 gateway.
D. The Cisco TelePresence VCS will permit all traffic from any H.323 or SIP endpoint that is registered locally.