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

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SIP Provider Trunking

The final integration method isn’t so much integration with an existing PBX as it is a way to provide voice services between the end users without one of the other methods. SIP provider trunking uses an ITSP (Internet Telephony Service Provider) to deliver voice services across IP to an organization with Lync Server 2013, similar to how a service provider provisions Internet access.

The advantages to SIP trunking come in the form of flexibility, redundancy, and capacity. Failover of Direct Inward Dial (DID) numbers between geographic regions using TDM infrastructure is usually impossible or incredibly expensive, but because SIP trunks are simply an IP connection, they can point at multiple locations for primary and backup ...

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