Go back to 642-278 - Implementing CUCM for TelePresence Video Solutions Exam

Question :-

Which of the following best describes SIP trunks?
SIP trunks use the SIP REGISTER messages to register with SIP proxy function that is built into Cisco Unified Communications manager
SIP trunks do not use SIP REGISTER messages
SIP trunks always use TCP
The default UDP port that is used is 2000.

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