Shawn Merdinger recently posted to the VOIPSEC mailing list the link to this Google Tech Talk back in August 2010 about the history of VoIP. The video runs close to 2 hours but provides a really good background in terms of the protocols and efforts starting with ARPA work back in the 1970's and moving up to today... well worth a viewing if you want to gain some historical context for where we are today.
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