Polycom, Inc. 4-1
4
Additional Conferencing Information
Various conferencing modes and video features require additional settings, such as system
flag settings, conference parameters and other settings. In depth explanations of these
additional settings are described in the following sections:
•"Content Sharing” on page4-1
•"Video Preview” on page4-21
•"Auto Scan and Customized Polling in Video Layout” on page4-24
•"Media Encryption” on page4-27
•"Packet Loss Compensation (LPR and DBA)” on page 4-35
•"Lecture Mode” on page4-38
•"]Audio Algorithm Support” on page 4-45
•"Permanent Conference” on page 4-48

Content Sharing

Content such as graphics, presentations, documents or live video can be shared with
conference participants using the H.239 (H.323) or BFCP (SIP) protocol, which is the
standard protocols for content sharing.

H.239 Protocol

The H.239 protocol allows compliant endpoints to transmit and receive two simultaneous
video streams:
People video stream – video is displayed in Continuous Presence conferences
Content video stream – Video Switching mode for content sharing
By default, all conferences, Entry Queues, and Meeting Rooms launched on the Collaboration
Server have H.239 capabilities.
To view Content, endpoints must use the same Bit Rate, Protocol, and Resolution. Endpoints
may not send Content while connecting to an Entry Queue.
Endpoints without H.239 capability can connect to the video conference without Content.
Cascade links declare H.239 capabilities and they are supported in Star cascading
topologies. For more details, see .