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How can you register a prefix to route all SIP calls beginning with that prefix to the Cisco TelePresence MCU?

How can you register a prefix to route all SIP calls beginning with that prefix to the Cisco TelePresence MCU?
A. You cannot; all SIP addresses must be registered individually.
B. The H.323 prefix is automatically used.
C. You cannot; you need to use a suffix in the form of a domain.
D. The username is used as the suffix.
Answer: A