Pin layout of 3.5 mm audio jack of handsets

The 3.5 mm jack can be used to connect a headset.

The pin layout follows the CTiA Standard.

Beginning from the tip, the segments are as follows:


Tip = Audio Left

2nd segment = Audio right

3rd segment = Ground/Mass

4th segment (cableside) = Aux / Microphone


By now the following handsets have a 3.5 mm audio jack:

- Comfort 500HX

- Comfort 520HX

- Comfort 550HX

- Comfort 551HX (Switzerland only)

- Comfort 552HX (USA/Canada only)




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