Headphone and mic does AUTOANSWER - Howto avoid?

[Trevor2]

I've tried the headphone and mic in my Palm Treo Pro and have seen that whenever jack is plugged it does an autoanswer of the phone calls.

I am not able to to set settings for avoiding autoanswer whenever jack is plugged. Do you know how to do it?

And NO, I don't have it checked in Settings / Phone / More / Answer incoming calls automatically. It only does it whenever mic jack is plugged.

Thank's in advance!