'SIT Tones & Telemarketing [OT]'
|First, this really needs to be marked OT until we get a bit closer to
designing a PIC based system to do it....
SIT (Special Information Tones) tones: the triple tone that you get when
you dial a number that doesn't exist (3 tones, each higher in pitch than the
last) Used by CDA (Call Disposition Analyzers) to differentiate between
human voices and recorded announcements and categorize their type. Most
CDA's merely look for three sequential tones occurring in less than 3
seconds using a band-pass filter centered around 600 Hz.
Loren D. Cahlander of AMCOM Software, Inc. 5555 West 78th St Suite Q says
Minneapolis, MN 55435
>From the documentation that I have, there are four different sequences of
First Tone Second Tone Third Tone
Tone Tone freq length freq length freq length
Name Description (Hz)(10 ms) (Hz) (10 ms) (Hz) (10 ms)
NC No Circuit 985.2 38.0 1428.5 38.0 1776.7 38.0
IC Operator 913.8 27.4 1370.6 27.4 1776.7 38.0
VC Vacant Circuit 985.2 38.0 1370.6 27.4 1776.7 38.0
RO ReOrder 913.8 27.4 1428.5 38.0 1776.7 38.0
Macy Hallock of F M Systems, Inc. 150 Highland Dr. Medina, OH 44256 says:
Period Frequency Designation
SSL LLL IC - Intercept - Vacant No. or AIS or etc.
LLL LLL NC - No Circuit (Inter-LATA carrier)
LSL HLL VC - Vacant Code
SLL HLL RO - Reorder Announcement (Inter-LATA Carrier)
LSS LHL #1 - Add'l Reserved Code
SLL LHL RO - Reorder Announcement
SSL HHL #2 - Add'l Reserved Code
LLL LLL NC - No Circuit, Emergency or Trunk Blockage
Where: Period-Duration: S=Short 274 msec L=Long 380 msec
Frequency: L=Low 913.8 Hz 1370.6 Hz 1776.7 Hz
H=High 985.2 Hz 1428.5 Hz
This information taken from a central office recorder/announcer installation
manual ca. 1983. I believe SIT's are specified by Bellcore and/orr CCITT. I
have heard SIT's used on international calls to several countries.
I have not been able to confirm that SIT is spec'd by CCITT (now
http://www.ITU.org ) or by BellCore (I don't think they are online?). I
would kill or die to know the actual source. <GRIN>
Telemarketers HATE Answering machines:
Techniques for call progress detection are readily available by looking at
U.S. Pat. 5,724,420
Automatic Call Distribution with Answer Machine Detection
U.S. Pat. 5,430,792
Automated Telephone Calling System
U.S. Pat. 5,371,787
Machine Answer Detection
Getting this type of information in an organized format is one of the main
goals of my
http://techref.homepage.com project. Any help is greatly appreciated.
James Newton geocities.com phone:1-619-652-0593 jamesnewton
http://techref.homepage.com NOW OPEN (R/O) TO NON-MEMBERS!
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From: pic microcontroller discussion list
[MITVMA.MIT.EDU]On Behalf Of Brooke Clarke PICLIST
Sent: Sunday, December 12, 1999 8:10 PM
Subject: SIT Tones & Telemarketing
Does anyone have information on what tones you need to send to all
incoming calls to make telemarketing systems think your line does not
exist, I think they are called SIT tones. This might be a useful 8-pin
> SIT (Special Information Tones) tones: the triple tone that you get when
> you dial a number that doesn't exist (3 tones, each higher in pitch than
> last) Used by CDA (Call Disposition Analyzers) to differentiate between
> human voices and recorded announcements and categorize their type. Most
> CDA's merely look for three sequential tones occurring in less than 3
> seconds using a band-pass filter centered around 600 Hz.
I just want to know what bozo decided to put them on line at +20dBm.
Special Punishment Tones, if you ask me.
Martin McCormick wrote:
The "You misdialed" tones are sure loud enough around here, enough to
crack an eardrum...
If you wanted a PIC to produce those, you might want to PWM them, using
"magic sines", then RC filter the result to give a clean sine-ish wave
form. Square waves are SO nice in higher odd harmonics <G> Probably
could just low-pass filter them, if the tones are right (and, the phone
line probably helps roll off the upper frequencies <G>)
James - saw your post; Good info - Thanks! This'd make a good 12C508A
project, I'm out of small cheap speakers though, for testing, darnit
<G> (Used to be able to get one for under a buck, now everyone wants $%
or so?!?) That'd be great to put on my BBS and FAX lines here. Would
want a good telephone interface design/IC, of course, in there <G>
I re-ship for small US & overseas businesses, world-wide.
(For private individuals at cost; ask.)
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