Chapter 7 - Conference Types

H.239/People+Content (H.239/P+C) Options

H.239 and People+Content are very similar in function, but differ in the type of signaling used for each protocol. People+Content is the Polycom proprietary protocol while H.239 is the industry standard. When an endpoint can support both H.239 and People+Content protocols, H.239 is selected as the preferred communications protocol.

In the Reservation Template Settings - Dual Stream mode drop down box, three H.239 People+Content (H.239/P+C) Video streaming formats are available.

Graphics - for standard graphics

Hi-res Graphics - for high quality display or highly detailed graphics

Live Video - for video clips or live video display

Table 7-2: Content bitrate according to Content Resolution and Conference Line Rate

Conference Rate (Kbps)

64

128*

192*

256*

320*

384

512

768

1152

1472

1536

1920

 

Graphics

0

64/0

64

64

128

128

128

256

256

256

256

256

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dual

Hi-Res

0

64/0

64

128

192

192

256

384

384

512

512

512

Stream

Graphics

 

 

 

 

 

 

 

 

 

 

 

 

Mode

 

 

 

 

 

 

 

 

 

 

 

 

 

Live Video

0

64/0

128/

192/

256/

256

384

512

512

768

768

768

 

 

 

 

 

64

128

192

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

128 Kbps is the minimum Line Rate setting for a H.239/People+Content conference. When the Content channel opens, the required bit rate is taken from the video channel bit rate, and may affect the quality of the transmitted video quality. The bit rate allocated to the Content channel depends on the conference type and the conference line rate, where the minimum is 64 Kbps, and increases in multiple of 64 Kbps. The bite rate allocation is dynamic and when the Content channel closes, the video bit rate is restored to its maximum.

People+Content in a Cascading conference is enabled only for Video Switching IP Only conferences, in a Star Cascaded topology.

H.239 and People+Content supports the following features:

Entry Queues

Highest Common Phase 2

H.264

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Polycom 8 manual 239/People+Content H.239/P+C Options