The Deploying the Survivable Branch Appliance in Lync Server 2010 for Cisco Integrated Services Router/Service Ready Engine white paper is now available from the Microsoft Download Center. This white paper describes how to use a Cisco 3925 ISR G2 configured with a SRE-900 Service Module (Cisco Service Ready Engine Virtualization (SRE-V) support platform) to be deployed as a Survivable Branch Appliance (SBA) in a Lync Server 2010 environment. In this configuration, Lync Server exists on a virtual installation of Windows Server 2008 R2 that is hosted on VMware ESXi. This white paper also includes instructions about how to install the SBA software, configure the device, and integrate it into your Lync Server deployment.

Authors: Karl Good and Jack Wight

Publication date: December 14, 2011

Product version: Microsoft Lync Server 2010


The Survivable Branch Appliance (SBA) is a purpose-built appliance to increase voice resiliency in branch office scenarios. Built by Microsoft unified communications (UC) partners, this appliance is a blade server running the Windows Server 2008 R2 operating system and Microsoft Lync Server 2010 communications software. The SBA is built with an Integrated Services Digital Network (ISDN) card and comes pre-installed with Lync Server 2010 Registrar and Mediation Server components with a public switched telephone network (PSTN) gateway in a single appliance chassis. The SBA is targeted for branch office scenarios to provide high availability to the majority of Lync Server services (particularly Enterprise Voice) in the face of network connectivity failures in the primary site where Lync Server is deployed.

Successfully deploying the SBA with Cisco ISR/SRE helps you ensure that you can keep important communication links open with this specific combination of services. The introduction of the SBA role deployed on a Cisco 3925 ISR G2 configured with a 900 Series SRE module also helps ensure voice only between branch office sites can be maintained in the event of a network connectivity failure.

This white paper includes the following sections.

  • Planning to Deploy a Generic SBA

Planning for a successful generic SBA deployment includes:

    • Defining a static IP address for an SBA
    • Defining an Active Directory name for an SBA
    • Defining a central office site
    • Adding a branch office site by using Topology Builder
    • Creating an SBA in a Cisco ISR/SRE environment
    • Special Active Directory user accounts
    • Setting up client computers running Lync 2010
  • Setting up a Cisco ISR/SRE
  • Configuring the Cisco Router – Network
  • Creating a Virtual Windows Image on the Cisco ISR/SRE
  • Configuring the Cisco Router – Telephony

Configuring the Cisco router for telephony includes:

    • Establishing PSTN Connections
  • Installing an SBA on a Cisco ISR/SRE

Successfully installing an SBA on a previously installed virtual Windows Server 2008 R2 image requires following these manual steps:

    • Setting the SBA registry key
    • Installing the SBA software
  • Homing users in the SBA
  • Testing your new SBA deployment
  • Troubleshooting your SBA and Cisco ISR/SRE deployment


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