Since Hugo has admitted, the cellphone input is digital. The only thing that stands in the way, is a will to implement a user selectable option on how that line is used.

Personally I don't expect to mount a cell phone in my car so the loss of cell phone mute is, well...... mute.

Actually my Seibring has, as a part of its factory sound system, top up/down sensing. It works so I haven't felt any desire to tear things apart to find out exactly how. Won't either unless this wish comes true. If possible I will tap into that. If not, I will add a lever/plunger/lanyard/whatever operated switch that will provide acceptable inputs.

Glenn

PS Hugo, That cellphone line. It wouldn't happen to be tied to an A/D converter would it? Even a simple one would allow multifunction use of that input.