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Why do I need the UDP port range 50000-59999 open across the firewall for calls from a Lync client when using the Cisco Meeting Server?

Lync clients have the ability to send media to the Lync Edge server over a TCP connection to port 443 or over UDP in the 50000-59999 range. However, the Meeting Server only supports UDP for audio and main video (because this is preferable to TCP for several reasons). Therefore the ports need to be open to allow the Lync client to use UDP.