I'd like to use a 3.5mm headset instead of the normal phone receiver (with a rj9 plug), I can find only 2.5mm (male) to rj9 male adapter, but it is not what I need. Any hint?
closed as off topic by fretje, Jeff Atwood♦ Mar 18 '10 at 4:00
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There are several places that sell 2.5mm to 3.5mm connectors. Make certain that it's got the two rings on the jack, not just the one, otherwise you'll end up with mono output.
I got one of these a while back and hooked it up to my Nokia 6275i without problem: