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http://www.mobicents.org-a.googlepages.com/products_sip_servlets.html
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http://www.directcentrex.com
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http://people.via.ecp.fr/~alexis/asterisk
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http://www.sip-communicator.org
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http://groups.google.com/group/low-cost-ata/topics
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http://www.reseaucitoyen.be/wiki/index.php/OpenMcu
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http://www.hackszine.com/blog/archive...ip_calls_wi.html?CMP=OTC-7G2N43923558
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http://www.howtoforge.com/voip_qos_traffic_shaping_iproute2_asterisk
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http://www.rowetel.com/blog/?p=27