Verbinden

Voice over IP and IP Telephony: References
http://www.cis.ohio-state.edu/~jain/refs/ref_voip.htm

VoIP Howto
http://www.nwfusion.com/research/voip.html

Research: Voice over IP
http://www.voip-calculator.com/directory/search.htx?page=1&category=4

VoIP news, links, acronym dictionary, surveys, newsletter
http://www.voipwatch.com

Resources about VoIP (and other) Standards
http://www.itu.int

Everything about the Session Initiation Protocol (SIP)
http://www.sipcenter.com

Portal for VoIP, IP Telephony, etc.
http://www.swingspan.net

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