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http://www.martinandalex.com/blog/archives/guide_to_voip/index.html
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http://www.hackszine.com/blog/archive...ip_calls_wi.html?CMP=OTC-7G2N43923558
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http://www.softwink.com/papers/Installation_Securing_VoIP_With_Linux
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http://blog.tmcnet.com/blog/tom-keati...skype/ip-thinking-skype-pda-phone.asp
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http://www.mobicents.org-a.googlepages.com/products_sip_servlets.html
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http://mobile.newsforge.com/article.p...amp;tid=104&tid=132&pagenum=1