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http://blog.tmcnet.com/blog/tom-keati...-breaks-skypes-great-wall-of-voip.asp
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http://www.rsdevs.com/psgw_linux.shtml
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http://www.cisco.com/en/US/products/s...ture_guide09186a0080181111.html#64013
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http://www.voip-info.org/wiki/index.php?page=Asterisk+cisco+FXO
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http://www.ietf.org/proceedings/03mar...aft-ietf-sipping-torture-tests-00.txt
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http://www.sipcenter.com/sip.nsf/html/Testing+Measurement
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http://www.sipconnect.info/mc/page.do
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http://voip-itec.tamu.edu/files/reference/sip%20call%20flow.pdf
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