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http://www.martinandalex.com/blog/archives/guide_to_voip/index.html
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http://www.okay.dyndns.org/okhp/linux/asterisk
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http://www.richard.neill.hemscott.net/voip.html
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http://changelog.complete.org/node/375
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http://www.grynx.com/index.php/projects/build-your-own-chat-cord
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http://www.engadget.com/entry/1234000770044260
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http://sipath.sourceforge.net/weblinks.php
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http://www.softwink.com/papers/Installation_Securing_VoIP_With_Linux