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There are lots of great Web sites to learn about VoIP.
First I'd try SearchNetworking.com's White Paper section:
http://searchnetworking.techtarget.com/whitepapersByCategory/0,293837,sid7_tax289252,00.html
Also see SearchNetworking.com's Best Web Links:
http://searchnetworking.techtarget.com/bestWebLinks/0,289521,sid7_tax39e,00.html
And these external sites have lots of good stuff:
http://computer.howstuffworks.com/ip-telephony.htm
http://www.protocols.com/voip.htm
http://www.networkcomputing.com/918/918f1.html
http://www.webtorials.com/siteindex.shtml (search for papers on VoIP)
http://www.voip-news.com/
http://www.cisco.com/univercd/cc/td/doc/product/rtrmgmt/qos/qpm3_0/qpm30gs/ktiptel.htm
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