My cordless phone (No not a cell phone, this is a landline. They still exist, you young whippersnappers.) worked with a head set thus: http://www.maxiaids.com/ProdImages/9700750.jpg [Broken] which has a 2.5mm jack. (It looks like a stereo jack i.e. three contacts but of course, it won't be stereo, it will be speaker and mic) I wanted a smaller, lighter headset so I bought something like this: Problem is, it has two jacks (one for speaker, one for mic, colour-coded pink and green) and they are 3.5mm (and also three contacts). I don't have a problem converting from 3.5 to 2.5, my difficulty is converting from single connector to this double connector. Clearly I can't simply use a Y-connector, since all that will do is feed the speaker and mic lines into each other. Is there an adapter like what I'm looking for? What can I do?