When you deploy Microsoft Lync Server 2013 to a computer that is running Windows Server 2012, the Lync Server 2013 Front End service (RTCSRV) cannot start.
There are other potential symptoms that may be related, but they do not involve the RTCSRV service. For example,
If you have Lync server installed, you’ll find it’s not very easy to find the client versions.
This simple program makes it very easy.
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If you want to integrate an Avaya S8300 Communications Manager with Microsoft Lync Server 2010,
you need to establish a Direct SIP connection between the two.
This document provides a step-by-step guide for configuring Avaya Communications Manager S8300 with Lync Server 2010.
Download Integrating Microsoft Lync Server 2010 and Avaya Communications Manager S8300
Start And ALL Programs And Folder Microsoft Lync Server 2010
Select Lync Server Management Shell And Stop All Lync Services Is Stop-CsWindowsService