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Lync 2013 Conferencing Location Based Routing (LBR)

3/31/2015

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In the previous blog article, we discussed the capabilities of Lync 2013 LBR that was introduced in CU1. This allows the prevention of PSTN Toll By-pass which is prohibited by government regulations in countries such as India. For example, Lync user A in Delhi can make a call to a local Delhi PSTN number using the PSTN Gateway in Delhi. But when the same user travels to Mumbai and tries to make a call back to a local Delhi PSTN number, LBR will not allow this user to use the same PSTN Gateway in Delhi via the Mumbai-Delhi WAN link. While this covers the Peer-2-Peer calling restrictions, it does not address conferencing scenarios. For example, Lync user A in Delhi first makes a call to a local Delhi PSTN number using the PSTN Gateway in Delhi, then adds Lync user B in Mumbai to create a 3 party AVMCU conference. If the conference is allowed, then User B is effectively using PSTN Toll-Bypass, and TRAI regulations also prohibit the mixing of VOIP and PSTN calls. To address this scenario, we need to configure and enable Conferencing LBR, which was introduced in Lync 2013 CU2. In this article we explore the configuration of Conferencing LBR and testing with Polycom CX600 phones. Below is the diagram of the test scenario:
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