How to integrate open source PBXs with Exchange
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An anonymous reader writes "A blogger from down under has put together an in-depth guide of how to use the open source IP-PBX products Asterix and sipX to connect to a Microsoft Exchange 2007 Unified Messaging server. The guide details how anyone can setup a system that provides VoIP and PSTN access to their email, calendar, contacts, and corporate directory. A link to the 120 day trial of Exchange 2007 is also included, so the whole thing can be set up at no cost."