Sennheiser PXC 550-II Instruction Manual page 23

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Tap the touch pad:
Touch gesture
Tap 1x
Tap 1x
Hold for 1 sec Rejects a call
Tap 2x
Tap 1x
Tap 2x
Tap 2x
Function
Accepts a call
Ends a call
Voice prompt "Call ended"
Voice prompt "Call rejected"
Puts an active call on hold
Accepts an incoming call and ends
the active call
Puts the active call on hold and
accepts an incoming call
Toggles between the active call and
the call on hold
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