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[<jbormel@warren.med>]

Tony,
   Regarding the microphone not working with the TP750,
Yep!  the first mike I tried also didn't work, but another
one did.  Both were sold for computer/multimedia use.
(fortuneately, I didn't have to buy either one, we had them
for other uses).  I suspect it's a mismatched impedance
thing.  Just try other microphones.  (The one that didn't
work was the multimedia handset model).
    Joe