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

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Session Border Controllers

Anytime SIP trunking is discussed, the question about Session Border Controllers (SBCs) appears. An SBC is in the same vein as a media gateway, and in many cases the gateways qualified for Lync can also act as an SBC, but their purposes are very different. The difference with an SBC is that it’s exclusively used for SIP-to-SIP connections as opposed to interacting with a TDM infrastructure. These devices are used by the ITSP, but it is entirely optional for an organization to deploy its own SBC. When an SBC is being deployed, there will be a SIP trunk between the ITSP and the SBC, and another between the SBC and the Lync Server environment. There are several advantages to using an SBC, but the necessity of using one ...

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