Appendix H-Setting the MCU for Integration Into Microsoft Environment

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.

Polycom, Inc.

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Polycom DOC2702A, RMX 1500 manual FEC Support, Media Over TCP, Network Error Recovery, SIP Dialog Recovery

DOC2702A, RMX 1500 specifications

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