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Lync Server 2013: Ports and protocols for internal servers ...
https://docs.microsoft.com/en-us/previous-versions/office/lync-server-2013/lync-server-2013-ports-and-protocols-for-internal-servers
Lync Server 2013: Determine external A/V firewall and …
https://docs.microsoft.com/en-us/previous-versions/office/lync-server-2013/lync-server-2013-determine-external-a-v-firewall-and-port-requirements
Audio RTP payload for Lync - social.technet.microsoft.com
https://social.technet.microsoft.com/forums/lync/en-US/128a4d52-c2ce-438d-8f22-7ba358eef986/audio-rtp-payload-for-lync
Payload types 114 and 115 are used by MS for RT Audio and these are proprietary protocols used by Lync (and OCS). Proposed as answer by ALANMAD Thursday, November 29, 2012 3:55 PM Marked as answer by Kent-Huang Monday, December 3, 2012 1:59 AM
Audio Device settings - support.microsoft.com
https://support.microsoft.com/en-us/office/audio-device-settings-c148de81-269c-4c08-adad-346b6351f3d2
Understanding Lync Modalities : Jeff Schertz's Blog
http://blog.schertz.name/2014/08/understanding-lync-modalities/
For audio streams UDP is the default protocol but if that cannot be established then Lync can fallback to using TCP, which is less desirable for delivery of real-time media over IP networks. If direct connectivity between the two clients fails for any reason then ICE will be used to leverage the Edge Server for assistance.
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