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Chapter 4-Video Protocols and Resolution Configuration for CP Conferencing
Polycom, Inc. 4-3
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 RealPresence 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 16-14.
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.
• Click & View is supported in H.263 4CIF.
• AES encryption is supported with H.263 4CIF.
• H.263 4CIF is supported in recording by the RSS2000 and other recording devices.
• All video layouts are supported in H.263 4CIF, except 1x1 layout. In a 1x1 layout, the
resolution will be CIF.
• For information about Resource Usage see Table 19-7 on page 19-8.
• 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 video protocol used: 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
required. For example, a 512 kbps call will have the video quality of a 1Mbps HD call
while a 1Mbps HD call has higher video quality at the same (1Mbps) bit rate.
By default, the system shipped with three pre-defined settings of the decision matrix for
H.264 Base Profile and three pre-defined settings of the decision matrix for H.264 High Profile:
• Resource-Quality Balanced (default)
A balance between video quality and resource usage.
• Resource Optimized
System resource usage is optimized by allowing high resolution connections only at
high line rates and may result in lower video resolutions (in comparison to other
resolution configurations) for some line rates. This option allows to save MCU
resources and increase the number of participant connections.
384 - 1920+ 4CIF 15
Table 4-1 Video Quality vs. Line Rate (Continued)
Endpoint Line Rate Kbps
Video Quality
Resolution Frame Rate