Assume that you have branch sites in the topology of a Microsoft Lync Server 2010 environment. You deploy Survivable Branch Appliances (SBA) or Survivable Branch Servers (SBS) to the environment. In this situation, the Registrar service (RTCSrv.exe) may crash on a Lync Server 2010 server in the environment.
This issue occurs because the Registrar service encounters an access violation when the Registrar service tries to register a branch user whose home server is set to a branch site.
For more information about how to deploy a Survivable Branch Appliance or Survivable Branch Server, go to the following Microsoft website:
Article ID: 2796755 - Last Review: Mar 14, 2013 - Revision: 1
Microsoft Lync Server 2010 Enterprise Edition, Microsoft Lync Server 2010 Standard Edition