Which of the following statements are correct regarding MultiSite and Multiway? (Choose two.)

A.
MultiSite requires a Cisco MCU.

B.
MultiSite requires a Cisco VCS.

C.
Multiway requires an option key on the endpoints.

D.
Multiway supports more simultaneous participants than MultiSite.

E.
MultiSite and Multiway both support ad-hoc conferences.

Explanation:
MultiSite and Multiway both support ad-hoc conferences; however, Multiway supports more simultaneous
participants than MultiSite. Ad-hoc conferences are unscheduled, on-demand conferences. MultiSite allows four
simultaneous participants on a video call. Multiway allows many more participants and is limited only by the
multipoint control unit (MCU) that controls the conferencing. To participate in an ad-hoc conference, simply
press the Conf, Join, cBarge, or Add keys on the endpoint.
MultiSite uses a phone’s native MCU functionality, so it does not require a Cisco TelePresence MCU or a Cisco
TelePresence Video Communication Server (VCS). However, it requires that a MultiSite option key be installed
on each endpoint.
Multiway uses an external MCU to handle conferencing. Therefore, Multiway requires a Cisco MCU and a Cisco
VCS. MultiSite and Multiway are mutually exclusive; if Multiway is used on your network, you should disable
MultiSite on the endpoints.

Cisco: Using Multiway with Cisco TelePresence systems
Cisco: Cisco Rich Media Conferencing: Ad-hoc Audio Conference
Cisco: Cisco TelePresence SX20 Quick Set, Product Overview (PDF)