| ??? 02/07/05 18:31 Modified: 02/07/05 18:38 Read: times |
#86792 - Special Information Tone - SIT Responding to: ???'s previous message |
Joseph Hebert said:
Have you ever dialed a number and gotten that three-tone signal, "buup-boop-beep," of three increasingly higher frequencies, just before the voice says "I'm sorry. The number you have reached has been disconnected or is no longer a working number." This tone sequence is known (at least in the UK) as the Special Information Tone, or "SIT" For the UK network, see the BT Supplier's Information Note SIN350: http://www.sinet.bt.com/350v1p2.pdf This includes the full specification of the frequencies, cadence, and amplitudes - so that you can get your TeleZapper just right! I should add that these tones are specifically defined as being generated by the network. Any generation of them by your own equipment is entirely at your own risk! |
| Topic | Author | Date |
| sending high frequency signal over phone | 01/01/70 00:00 | |
| sending high frequency | 01/01/70 00:00 | |
| High Freq | 01/01/70 00:00 | |
| A low-pass filter! | 01/01/70 00:00 | |
| Why oh why | 01/01/70 00:00 | |
| a possible why | 01/01/70 00:00 | |
| Unfortunately not. :-( | 01/01/70 00:00 | |
| Annoying telemarketers | 01/01/70 00:00 | |
| Special Information Tone - SIT | 01/01/70 00:00 | |
| oh no | 01/01/70 00:00 | |
| CMX850 | 01/01/70 00:00 | |
| this is what i am pondering | 01/01/70 00:00 | |
| this is what i am pondering | 01/01/70 00:00 | |
| that is called a modem | 01/01/70 00:00 | |
| im not wanting to get on the net | 01/01/70 00:00 | |
| modem and the net | 01/01/70 00:00 | |
| Modems and Video | 01/01/70 00:00 | |
| 56K | 01/01/70 00:00 | |
| Video | 01/01/70 00:00 | |
| details | 01/01/70 00:00 | |
| Yes, it *is* a modem! | 01/01/70 00:00 | |
| ok there is some confusion | 01/01/70 00:00 | |
| confusion all right ... | 01/01/70 00:00 | |
| suggested texts | 01/01/70 00:00 | |
| Confusion | 01/01/70 00:00 | |
Watching movies over the phone | 01/01/70 00:00 |