Least Cost Routing
Voice administrators are commonly asked to implement a feature referred to as least cost routing (LCR). This term is loosely mixed up with tail-end hop off (discussed in the next section). In a traditional telephony environment in which each office or building had a different PBX, this referred to creating “tie-lines” or trunks between the systems so that calls between two internal employees would not traverse the PSTN and incur toll charges. The good news for Lync administrators is that this requires zero configuration in Lync Server 2013. Least cost routing for calls between internal employees is native to the product because all calls route the media in a peer-to-peer scenario.
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