I'm planning on purchasing a telephone headset for my iPhone 5S and I'm having a difficult time finding out if it is possible to get sidetone from an iPhone or headset. When a telephone produces sidetone, you can hear your own voice in the earpiece as you speak into the microphone, which is what most of us are used to with landline telephones. The question is, can the 5S produce sidetone and, if so, what headsets let the user control it? So far, in contacting the relevant companies, I've received contradictory information and an Apple rep who didn't know the answer. IF it's technically possible to produce with good sound quality, it should be the standard. Any help would be appreciated.