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Microsoft® Lync Server 2010 Unleashed by Tom Pacyk, Andrew Abbate, Alex Lewis

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Voice Resilience

Voice resiliency in Lync Server 2010 is achieved by providing endpoints with a primary and backup registrar service. The registrar service existed in Office Communications Server 2007 R2 as part of the Front End Service, but has been separated into its own role in Lync Server 2010 to provide failover capabilities for voice features. When Lync endpoints sign in, they are informed through in-band signaling of both a primary and backup registrar pool associated with their account. The primary registrar pool will typically be the Front End pool where the user account is homed, except in branch office scenarios. There are two different voice resilience scenarios that should be accounted for: datacenter survivability and branch site ...

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