Remote Site Survivability

Another welcome feature new to Lync Server 2010 is the capability for branch sites to continue PSTN call access in the event of a WAN failure, making the Front End pool unavailable to the location.

→ More details about remote site surviviability can be found in Chapter 28. However, remote surviviability is primarily accomplished through the use of PSTN gateways in each branch office.

A special type of gateway called a survivable branch appliance also serves as a registrar for users in the branch locations so that when a WAN connection goes out, the users stay logged in to their Lync client. For larger branch sites, a Lync Front End pool can be created and paired with a PSTN gateway or Internet Telephony Service Provider SIP trunk to provide resiliency.