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    Lync clients behind strict firewalls


    If you are behind a strict network, and only the minimum ports are allowed for B2B Lync communication, you may need to allow a few extra flows outbound:

    1) Your PC must be able to connet outbound to the internal interface of your Lync AV Edge server(s) on port 3478/UDP (blue arrow).

    2) Your Lync AV Edge server(s) must be able to connet outbound to Pexip Conferencing nodes for media, on portrange 40.000-49.999 TCP & UDP for optimal HD video and content sharing (orange arrow).


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