Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!bellcore!texbell!vector!telecom-gateway From: nvuxr!deej@bellcore.bellcore.com (David Lewis) Newsgroups: comp.dcom.telecom Subject: Re: The Tone Which Announces Request for Card Number Message-ID: Date: 4 Aug 89 17:38:50 GMT Sender: news@vector.Dallas.TX.US Organization: Bell Communications Research Lines: 18 Approved: telecom-request@vector.dallas.tx.us X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@vector.dallas.tx.us X-TELECOM-Digest: volume 9, issue 275, message 11 of 12 In article , 89.KREMEN@gsb-how. stanford.edu (The Arb) writes: > I am wondering about the "special tone" that one hears when > making a telephone credit card call using AT&T. Does anyone out know > at what frequency the tone is or is there even a standard? Once more, back to Notes on the BOC Intra-LATA Networks... from Table AQ, "Call Progress Tones"... Calling Card Service Prompt Tone consists of 941+1477 Hz followed immediately by 440 + 350 Hz, for 940 milliseconds (exponentially decayed from -10dBm per frequency an -3 TLP at time constant of 200 milliseconds). whatever *that* means... -- David G Lewis ...!bellcore!nvuxr!deej "If this is paradise, I wish I had a lawnmower."