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Appendix A-Glossary
A-4
H.230 ITU-T standard that defines simple multipoint control
systems procedures and describes network maintenance
functions.
H.231 ITU-T standard that defines a set of MCU functions and
operational requirements.
H.242 ITU-T standard that defines initiation of communications
between systems and capabilities negotiation procedures.
H.243 ITU-T standard that defines initiation of communications
between systems and capabilities negotiation procedures
in multipoint conferences.
H.261 ITU-T standard that defines the Px64 video coding
algorithm.
H.263 ITU-T standard that provides improved compression and
quality of video images at a line rate lower than 384 Kbps.
This standard is not supported by all codecs.
H.264* A proprietary Polycom Video compression standard.
H.264 ITU-T standard that provides improved compression and
quality of video images in lower line rate connections and
is part of the Highest Common mechanism in Video
Switching conferences.
H.320 ITU-T standard that defines how the H-series video
conferencing recommendations work together.
H.323 ITU-T standard for audio, video and data communications
across IP-based (LAN) networks, including the Internet.
ICE Interactive Connectivity Establishment (ICE) provides a
structure/protocol to unify the various NAT Traversal
techniques that are used to cross firewalls.
It enables SIP based endpoints to connect while
traversing a variety of firewalls that may exist between the
calling endpoint (local) and the MCU or called endpoint
(remote).
IP Internet Protocol. The working protocol that forms the
basis of the internet.
Abbreviation/
Term
Explanation