Re: [asterisk-biz] ATA Bank for Asterisk, 400 phones

I have used the Vega with good results. The version I used did 24 ports in 1U, but they also have a 48port in 1U model.

See http://www.vegastream.com/vegastream-portfolio/vega5000.asp

OP did not spec, but he may wish to have gateways distributed if not all phones come back to a central MDF. If so then adding multiple USB to a single server would be problematic.