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RealPresence Collaboration Server (RMX) 1500/1800/2000/4000 Administrator’s Guide
Polycom®, Inc. 1035
Configuring the Polycom-Microsoft Solution
See the Polycom HDX and Collaboration Server Systems Integration with Microsoft Office Communications
Server 2007 Deployment Guide for detailed steps on how to deploy a Polycom Collaboration Server system
for use with the video conferencing solution in Microsoft Lync Server 2010 environment.
Call Admission Control (CAC)
Microsoft Call Admission Control (CAC), a protocol that enables bandwidth management via the Policy
Server in federated (ICE) environment, is supported on the Collaboration Server.
The Policy server functionality enables the Lync server to manage the bandwidth allocated to the Lync client
when connecting to another Lync client or a video conference running on the Collaboration Server. The
bandwidth allocated by the Policy server may be the same or lower than the bandwidth requested by the
Lync client, which is based on the line rate of the conference.
Guidelines
● Microsoft CAC is available only with:
A Lync server (Wave 14)
Call Policy functionality enabled
The Call Admission Control enabled for the Lync Clients
ICE environment
Local network
● Microsoft CAC is applicable only to dial-in calls
● Additional configuration on the Microsoft side is not required. It is based on the existing ICE
environment configuration.
● Additional configuration (setting a system flag) may be required on the Collaboration Server to modify
the system behavior when CAC is enabled in a local network; closing the ICE channel or keeping it
open.
● Setting an additional system flag may be required on the Collaboration Server when running Video
Switching conferences.
For more details, see Collaboration Server Configuration for CAC Implementation.
FEC Support
Microsoft RTV FEC (Forward Error Correction) is supported in the Collaboration Server to control and
correct packet loss when receiving and sending video streams using the Microsoft Lync Server 2010
communications software. All RTV resolutions and options, including B Frame, are supported.
Redundant video packets are sent over the network during video stream transmission. When packet loss
occurs, FEC is automatically activated and the redundant packet is used to recover the lost packet.
When receiving video transmissions, packet loss automatically triggers FEC in the Collaboration Server.
When sending video transmissions, Collaboration Server sends FEC packets when the RTCP RX report
contains packet loss that is greater than or equal to 1 percent.