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http://www.packetizer.com/voip/sip/standards.html
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http://www.sipcenter.com/sip.nsf/html/Testing+Measurement
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http://blog.tmcnet.com/blog/tom-keati...-breaks-skypes-great-wall-of-voip.asp
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http://www.sipconnect.info/mc/page.do
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http://voipstore.atacomm.com/shops/Vi...Item.aspx/27934028032-34702223616.htm
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http://www.vopsecurity.org/html/tools.html
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http://www.sipura.com/support/spa3000faq/Section_2.html#15
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http://www.geekgazette.com/index.php?...com_content&task=view&id=28&Itemid=26
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