89.KREMEN@gsb-how.stanford.edu (The Arb) (07/31/89)
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?
edg@ames.arc.nasa.gov (Edward Greenberg) (08/01/89)
My understanding is that this is octothorpe (pound) followed by a decaying volume dialtone. The octothorpe unlocks the touchtone pad in certain cases. The dialtone is just a cue to the human to go ahead and dial. -e -- Ed Greenberg uunet!apple!netcom!edg
dave@rutgers.edu (Dave Levenson) (08/01/89)
In article <telecom-v09i0265m05@vector.dallas.tx.us>, 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? The tone that prompts the caller for the Calling Card number is the MCCS (mechanized calling card service) logo tone. It is usually called BONG. It consists of approximately 50 milliseconds of the touch-tone # symbol (two tones) followed by a frequency and amplitude shift that makes it appear to fade away. The # is used because the calling party may be using a tone phone behind a pulse PBX with a tone-to-pulse converter. Many such converters are disabled by the #, thus allowing the subscriber to dial the card number with touch-tones, and avoid having them translated into dial pulse. -- Dave Levenson Voice: (201) 647 0900 Westmark, Inc. Internet: dave@westmark.uu.net Warren, NJ, USA UUCP: {uunet | rutgers | att}!westmark!dave [The Man in the Mooney] AT&T Mail: !westmark!dave
tom@gatech.edu (Tom Wiencko) (08/02/89)
In article <telecom-v09i0265m05@vector.dallas.tx.us> 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? As a matter of fact, yes, there is a standard. My copy of the 1980 "Notes on the Network" tells it like this: A 941Hz plus 1477Hz tone for 60 msec at -10dBm/-3TLP followed by a 440Hz plus 350Hz tone for 940 msec exponentially decayed from -10dBm per frequency at -3TLP at time constant of 200 msec. This tone is affectionately known in some circles as the "bong." I believe that this is still the standard. Tom
deej@bellcore.bellcore.com (David Lewis) (08/05/89)
In article <telecom-v09i0265m05@vector.dallas.tx.us>, 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."