Quote:

As long as the call lasts, the telefon symbol is shown.
Only the mute-reaction is wrong.



Yeah, what Hussein's suggesting is that when a call is made, the line goes to 12v (or 0v), but when the call ends, the line floats, and stays near 12v (or 0v).

What you might need is a pull-up or pull-down resistor to ensure that it's either 12v or 0v, but not floating.

At least I think that's what he's getting at.
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-- roger