Chapter 4 - Setting Up Conferences
4-24
Highest Common Mechanism
In Video Switching conferences, the Highest Common mechanism enables
the MCU to select the optimal video parameters for the conference according
to the highest video capabilities that are common to all the endpoints
participating in the conference.
The selected common video is dynamically adjusted with each participant
connection to or disconnection from the conference. The Highest Common
mechanism is available with both H.320 and H.323 endpoints, but is not
available with SIP endpoints.
The Highest Common mechanism improves the connectivity between
endpoints, eliminates Secondary connections, and facilitates Entry Queue
Access and participant’s moves during conferences.
The Highest Common mechanism is enabled in the Conference Properties -
Settings dialog box by setting the basic video parameters to Auto.
The Highest Common mechanism in Video Switching conferences supports:
•Video Protocol (including H.263 and H.264)
•Video Format
•Frame Rate
•H.263 Annexes (N, F, T and I)
•ProMotion (NTSC or PAL Interlaced Video)
The Highest Common mechanism does not support the following options:
•Cascading conferences. The Highest Common mechanism is disabled in
Cascading conferences. When defining a Cascading conference, all the
cascaded conferences must be set to the same video protocol.
•H.264*/H.264L video protocols. Only the standard H.264 video protocol
is supported with the Highest Common mechanism.
•Dual Stream Mode - People & Content V0 and Visual Concert PC & FX.
For a detailed description of Cascading conference options, see “Defining
Cascading Conferences” in the MGC Manager User’s Guide, Volume II,
Chapter 1, “Advanced Conference Settings”.