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  1. dgh
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       #1  
    Does anyone know how the car kit knows there is a call coming in? It can mute the radio, so there must be some signal sent to the car kit. Does anyone know what it is?
  2. #2  
    Have not worked with the car kit but the Treo switches modes when a call comes in. When it detects a high impedance on the audio connector it knows that a microphone is connected and automatically switches to a mode support a mono output on the left earpiece and switching the right side to use a mic input rather than outputting sound.
    I would guess that the car kit senses the change in output (no longer getting an audio output from the Treo in the right channel).

    Quote Originally Posted by dgh
    Does anyone know how the car kit knows there is a call coming in? It can mute the radio, so there must be some signal sent to the car kit. Does anyone know what it is?

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