The colleague behind me talked to a customer when I read this. He had to press mute because of my hysterical laughter...

Thank you for the info, anyway. I do have the adapter (it came with my Nokia headset), just thought maybe I could finally get rid of it... (come think of it... it's the other way round: the headset is a medium male and has an adapter for small female... I'd have to keep the adapter anyway. Or get a different headset. So it doesn't matter much...)