Which statement is true when H.323 and SIP interworking is set to on in the Cisco TelePresence VCS?

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.

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