Which ITU-T recommendation defines the procedures for using more than one video channel in
H.
320-based systems?
A.
H.324
B.
H.230
C.
H.239
D.
H.264
E.
H.329
Explanation:
H)
239 is the ITU standard for a second video channel; this is supported by all the major vendors, and
is the only content channel standard supported by Cisco acquired Codian products or Cisco
TelePresence Serial Gateway Series products on H.323 video calls. Cisco acquired Codian products
need to be configured to enable H.239. Any H.323 endpoint that also supports the H.239 protocol
can source this channel, as can a VNC connection, though some endpoints need to be configured to
use H.239 instead of their proprietary solution.