Tom Evslin has this interesting observation about the quality of voice in the traditional phone:
The bandwidth of the telephone connection between our homes and the telephone network hasnâ€™t changed in my long lifetime. Although some noise has been eliminated in long distance calls (sometime and if weâ€™re not on a cellphone), voices on the phone still sound like they did sixty-five years ago. Weâ€™ve trained ourselves to accept the clipped quality of a telephone voice with its lack of emotional overtones.
You wouldnâ€™t dream of listening to music over the phone. You expect and get much better sound quality from almost any radio and on TV. Movies have Dolby sound. But the telephone is still the telephone.
He suggests that VoIP (think: Skype) is changing that.