![]() These devices can be simple black boxes hooked up between the phone jack and the phone (see exhibit 1-“tmstopper.pdf”), while others include a handset, which I use (see exhibit 2-“vetch telezapper manual”). ![]() The most commonly used SIT tone is the vacant number intercept SIT, that boo-eee-ooo sound you get when a number is no longer in service.įor landlines, technology already exists that allows an individual user to produce the vacant number intercept tone at home. SIT tones are three precise, sequential tones which are used by telephone companies to convey information about the condition of the phone line. The Special Information Tone (SIT) for vacant or blank numbers can and does stop robo-callers. USING THE SPECIAL INFORMATION TONE FOR VACANT NUMBERS TO STOP ROBO-CALLS
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