Microsoft Lync and traditional telephone lines

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http://serverfault.com – We're looking into the new Lync server from Microsoft and I'd like to get to the basics. One of the vague questions for me is regarding external calls. How does Lync connect you to an external call? Is this done via some kind of connection between the Lync server and a PBX? And, is that the only way you can make use of Lync? Regards, Jacques (HowTos)