I'm replacing my office phone with my iPhone, and want to be able use an over the head headset with a boom mic, not a bluetooth headset. Does anyone make one of these, are there adapters out there to convert my old one? My current headset is with a 2.5mm plug is of course not compatible with the iPhone 3.5mm socket. And although adapters which convert the plug sizes are available online, i don't know if they will convert a standard plug to the iphone's multichannel socket. Help please... anyone? anyone? thx!