Which of the following endpoints can communicate by using Cisco TelePresence VCS?

A.
only SIP endpoints

B.
only H.323 endpoints

C.
both SIP and H.323 endpoints

D.
neither SIP nor H.323 endpoints

Explanation:
Both Session Initiation Protocol (SIP) and H.323 endpoints can communicate by using Cisco TelePresence
Video Communication Server (VCS). Third-party standards-based SIP and H.323 systems can also be
integrated into the TelePresence environment.
In order to configure Cisco TelePresence VCS so that it can perform call control between SIP and H.323
endpoints, you must first create a transform that checks whether the called address contains the @ sign. If it
does not, an @ and the SIP domain name are appended to the called address, thereby standardizing SIP and
H.323 addresses.
After you create a transform to route calls, you must create two search rules. The first search rule removes the
SIP domain portion of the address and searches for a corresponding H.323registered device. The second rule,
which is used if no H.323 device is located, uses the full address to search for a corresponding SIP-registered
device.

Cisco: H.323 Video Internetworking Using VCS Technology Design Guide (PDF)