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Appendix H-Setting the MCU for Integration Into Microsoft Environment
Polycom, Inc. H-35
FEC Support
Microsoft RTV FEC (Forward Error Correction) is supported in the MCU 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 MCU.
When sending video transmissions, MCU sends FEC packets when the RTCP RX report
contains packet loss that is greater than or equal to 1 percent.
Media Over TCP
In previous MCU versions, media such as video, audio, content and FECC is transmitted
using the UDP transport protocol. In version 7.7, media is automatically transmitted
through TCP when UDP, the default transport protocol, is not available. Media over TCP is
supported using the Microsoft ICE environment.
The media transport protocol type (UDP/TCP) is displayed in the Participant Properties -
Channel Status - Advanced dialog box.
The media transport protocol type is displayed for the following IP addresses:
• MCU IP Address
• Participant IP Address
• ICE MCU IP Address - only when ICE is functional
• ICE Participant IP Address - only when ICE is functional
Network Error Recovery
When a short network error occurs, for example 5 seconds, MCU automatically recovers,
enabling calls in Microsoft Lync to continue the video or audio conference without
disconnecting. However, when a longer network error occurs, the call is disconnected. The
presence status mode is correctly updated from Busy to Available. There is no configuration
required for this procedure.
SIP Dialog Recovery
MCU has the ability to automatically recover from a SIP dialog failure, which can occur in
long duration calls in Meeting Rooms using the Microsoft Lync client. There is no
configuration required for this procedure.