This issue occurs in the following scenario:


This issue occurs because of a problem that occurs when Skype for Business (Lync 2013) is forced to use HTTP proxy server to relay media traffic.


To resolve this issue, install the June 9, 2015 update (KB3054791) for Lync 2013 (Skype for Business).

Note Lync 2013 was upgraded to Skype for Business in April 2015.

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