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Microsoft® Lync® Server 2013 Unleashed Second Edition by Randy Wintle, Alex Lewis, David Ross, Tom Pacyk

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Route Resiliency

Redundancy for a particular voice route can be provided two ways. The easiest is to simply add multiple trunks to the route. If multiple trunks exist on a route, calls will be distributed in a round-robin fashion among all the trunks. Although this is very easy to configure, it can be tough to troubleshoot because each call placed might require logging on a different trunk or gateway. In large environments this configuration is desirable because the calls are load balanced across multiple trunks.

The other option available is to create unique PSTN usages and voice routes for each gateway serving a location, and associate only one gateway to each. Then, add both PSTN usages to voice policies. In this case the calls will always ...

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