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Polycom® RealPresence Collaboration Server 800s Administrator’s Guide
I-6 Polycom, Inc.
Media Over TCP
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:
• Collaboration Server IP Address
• Participant IP Address
• ICE Collaboration Server 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, Collaboration Server
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
Collaboration Server 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.