Which of these must be enabled to set up a Cisco TelePresence soft client (such as Cisco Jabber or M

Which of these must be enabled to set up a Cisco TelePresence soft client (such as Cisco
Jabber or Movi) on a Cisco TelePresence VCS Expressway Starter Pack?

A.
SIP

B.
H.323

C.
interworking

D.
Multiway