Apparently, I don't know everything in VoIP 
, since I never heard of Newtec's Sat3Play until this morning. Sat3Play is a Satellite Triple Play system that offers 2-way communication to enable VoIP, Internet access, and video (IPTV). They categorize it as a "Satellite Multimedia Broadband system".They announced today that they has won the prestigious Frost and Sullivan European Product Innovation Award, for the company's Satellite Triple Play System (Sat3Play). Hmm, I may have to consider Sat3Play for the TMC Labs Innovation Awards. As long as I get to review it with free TV channels and free VoIP.
Essentially, Sat3Play is two-way satellite multimedia broadband system, made up of an intelligent combination of various standards including DVB-S2, DVB-RCS, SATMODE and TCP/IP. It allows optimized delivery of video and audio services, fast internet access and VoIP telephony, to both businesses and consumers in areas where broadband is not generally available.
Here's an architecture diagram:
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How is it possible to have good latency using satellite?
walkie talkie VoIP.. heh