I know when I used BroadvoxDirect.com the voice streams were through the switch, and it was a single stream from the TA. I do not know the technology of their switch, but I thought it would work that way with VOIPo.
http://www.dslreports.com/forum/remark,9859724
Back in good old 2004 when technology was all that
EDIT: Its a big selling point if three-way calling does not increase the bandwidth needed!
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