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Chapter 3-Video Protocols and Resolution Configuration for CP Conferencing
Polycom, Inc. 3-3
• HD1080p60 is not supported:
— With Content sharing.
CP Conferencing with H.263 4CIF
The video resolution of 4CIF in H.263 endpoints is only supported for conferences in which
the video quality is set to sharpness and for line rates of 384 Kbps to 1920 Kbps as shown in
the following table.
The Collaboration Server Web Client supports monitoring of H.263 4CIF information. The
H.245 or SDP tab includes the additional information.
The creation of a new H.263 4CIF slide is supported in the IVR Service in addition to the
current H.263 IVR slide. If users utilize the default Polycom slides that are delivered with
the Collaboration Server, the slide’s resolution will be as defined in the profile, i.e. SD, HD,
CIF, etc.
For more information see “High Resolution Slides” on page 15-13.
H.263 4CIF Guidelines
• H.263 4CIF is supported with H.323 and SIP connection endpoints.
• H.263 4CIF is supported in CP mode only.
• AES encryption is supported with H.263 4CIF.
• Recording of H.263 4CIF conferences is supported by the RSS 4000 and other devices.
• All video layouts are supported in H.263 4CIF, except 1x1 layout. In a 1x1 layout, the
resolution will be CIF.
• H.239 is supported in H.263 4CIF and is based on the same bandwidth decision matrix
as for HD.
The CP Resolution Decision Matrix
All the CP resolution options and settings are based on a decision matrix which matches
video resolutions to connection line rates, with the aim of providing the best balance
between resource usage and video quality at any given line rate.
The following factors affect the decision matrices:
• The used video protocol: H.264 base Profile or H.264 High Profile. The H.264 High Profile
maintains the Video quality at bit rates that are up to 50% lower than previously
Table 3-1 Video Quality vs. Line Rate
Endpoint
Line Rate Kbps
Video Quality
Motion Sharpness
Resolution Frame Rate Resolution Frame Rate
128 QCIF 30 CIF 30
256 CIF 30 CIF 30
384 - 1920+ CIF 30 4CIF 15