H.225
H.225 is part of the set of H.323 protocols. It defines the messages and procedures used by
gatekeepers to set up calls.
H.235
H.235 is the protocol used to authenticate trusted H.323 endpoints and encrypt the media stream during
meetings.
H.239
H.239 is a widespread protocol used with H.323 endpoints, to define the additional media channel for
data sharing (like presentations) alongside the videoconference, and ensures only one presenter at a
time.
H.243
H.243 is the protocol used with H.323 endpoints enabling them to remotely manage a videoconference.
H.245
H.245 is the protocol used to negotiate call parameters between endpoints, and can control a remote
endpoint from your local endpoint. It is part of the H.323 set of protocols.
H.261
H.261 is an older protocol used to compress CIF and QCIF video resolutions.
H.263
H.263 is an older a protocol used to compress video. It is an enhancement to the H.261 protocol.
H.264
H.264 is a widespread protocol used with SIP and H.323 endpoints, which defines video compression.
Compression algorithms include 4x4 transforms and a basic motion comparison algorithm called P-
slices. There are several profiles within H.264. The default profile is the H.264 Baseline Profile, but
H.264 High Profile uses more sophisticated compression techniques.
User Guide for Scopia XT5000 Series Version 3.2 Glossary of Terms for Scopia Solution | 100
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