How about a school strapped for cash, with around 60 POTS phones on
hand and an almost free source of another 60? Versus a cost (here in
Austria) of $99 for the cheapest VoIP phone (the cheapest Grandstream
model). Of course that also means that FXS is only of interest if
I can get it for under around $50-60/port -- if things cost more it
becomes easier to argue early replacement of these POTS phones by IP phones.
For that many analog phones, you probably want something like a channel bank(s), which can handle the both FXS and FXO lines and package them into T1's. These are pricey new, but if you have the flexibility - and many school financial officers frown on buying used or surplus equipment - you can get them on e-bay quite reasonably with a little effort. I was able to get my FXS/FXO cards (4 port) for about $25.00 (US) per analog line and a virtually new TSU-600 for $99.00.
Stephen R. Besch
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