AA> not required.   But the boxes *may* come in handy if you want
AA> to isolate the modem line from the rest of the phone circuit.
AA> The boxes on an extension phone help prevent interrupting an
AA> active modem session.
Somwhere i saw a little device that you install at the point where all your 
extentions split apart.. you wired all your lines into it, and it would only 
allow one extention to be used at a time, unless you did somthing like flash 
the phone circuit.. looked really handy...
Hans 
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