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Microsoft® Lync Server 2010 Unleashed by Tom Pacyk, Andrew Abbate, Alex Lewis

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Voice over IP

As internal networks began to grow, Voice over IP (VoIP) based PBXs began to emerge. Instead of using traditional analog lines to connect internal users, the VoIP handsets connected to the PBX over the IP protocol, just like a computer or any other device on the network. This allowed voice and data traffic to share a common infrastructure, which cuts down on wiring and management overheard.

Just like with traditional PBXs, VoIP requires some form of signaling to control the calls. An early form of signaling used for VoIP was H.323, and the Media Gateway Control Protocol (MGCP) has also gained widespread adoption.

The Session Initiation Protocol, or SIP, has also emerged as a standard that many IP PBXs use for signaling. Lync Server ...

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