To which of the following devices must a CTMS be trunked in order to support multipoint conferences?

A.
a Cisco VCS

B.
a Cisco Unified CM

C.
a Cisco TelePresence Server

D.
another CTMS

Explanation:
A Cisco TelePresence Multipoint Switch (CTMS) must be trunked to a Cisco Unified Communications Manager
(CM) in order to support multipoint conferences. Session Initiation Protocol (SIP) is used as the trunking
method.
A CTMS is not required for multipoint conferences? a Cisco TelePresence Server registered to Cisco
TelePresence Video Communication Server (VCS) can also handle multipoint conferences. A CTMS does not
need to be trunked to a Cisco VCS, to another CTMS, or to a Cisco TelePresence Server.

Cisco: Interoperability in Cisco TelePresence Multipoint and Network Multipoint Meetings
Cisco: Configuring Cisco Unified Communications Manager for CTMS