Following is a useful presentation about Voice over Internet Protocol. I was asked to deliver it by the members of the wireless access research group, University of Limerick, Ireland. I delivered this presentation to my group back in 2006. It is quite valuable especially from the point of view of its reflections on H.323 and the SIP protocol.
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Voice over Internet Protocol by Psyops Prime is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.