What is the technical term used for the 3 note or tone signal out of order phones send out?

Everyone has heard this signal - you get it when the number you are calling is out of service and or disconnected.i have heard there is a way to get this signal put on a GOOD line to "trick" the junk fax and auto dailers into not calling and leaving you alone as it is a "BAD" number-the tones are normally generated by the phone company,but there has to be a way to get them

Rocket J Squirrel2009-07-05T22:53:27Z

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Special Information Tone, or SIT. See site below.

I tried this for a while on my home answering machine, but it caused genuine callers to hang up without leaving a message, so I abandoned it.