Possible Clues:

• Don't knock until you've tried it
• Push it to ring for entry
• Chicks raised wing as indicator of arrival
• A ringer for Bolero adaptation in Donegal
• Way to achieve entrance as backward children, English learners
• Domestic chimer
• When depressed, you could find it helps to get over the threshold
• Visitor may get a buzz out of this implement, or phone inventor
• Bordello freaks out with one of those on the entrance that is loud when pressed
• White Stripes "I've thinking about my ___ when they gonna ring it?"