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Phone Tones
v2.01 r07Jun2001 1r05Sep2000
by Elf Qrin

Phone Keypad tones

In the DTMF (Dual Tone Multi Frequence) system, to each function are associated two tones sent simultaneously on the phone line.

These are the tones associated to the keys of a standard DTMF phone and the associated tones (note that a normal phone usually misses keys A, B, C, D, included only on operators' phones or in the phreak box known as the Silver Box):

	1209	1336	1477	1633
697	1	2	3	A
770	4	5	6	B
859	7	8	9	C
941	*	0	#	D

Key	Freq. 1	Freq. 2
1	697	1209
2	697	1336
3	697	1477
A	697	1633
4	770	1209
5	770	1336
6	770	1477
B	770	1633
7	859	1209
8	859	1336
9	859	1477
C	859	1633
*	941	1209
0	941	1336
#	941	1477
D	941	1633

More Dialing Tones

These tones are relative to the USA phone system.

On/Off Hook: 2600Hz. (Blue Box tone)
KP1 (National Call Start): 1700Hz+1100Hz.
KP2 (International Call Start from an intermediate): 1300Hz+1700Hz.
ST (Call Stop): 1500Hz+1700Hz.

Payphone tones (Red Box tones)

These tones are relative to the USA phone system.

Coin tones are beeps of 2200Hz+1700Hz as follows:

5 cents (nickel): 1 beep, 66 milliseconds duration.
10 cents (dime): 2 beeps, each 66 milliseconds duration with 66 millisecond pause between beeps.
25 cents (quarter): 5 beeps, each 33 milliseconds duration with a 33 millisecond pause between beeps.

Phone Company Tones

Dial-tone: 350Hz and 440Hz.
Busy-signal: 620Hz and 440Hz; on for 1/2 second, off for 1/2 second.
Attention (blasting tone you get when you forget to hang up the phone): 1400Hz, 2060Hz, 2450Hz, 2600Hz all mixed together. Pulsed at a rate of 5Hz.
Ring: 440Hz, 480 Hz.

On the old standard ESSX or DMS-100 switching systems, you only get one type of ring, while on a SLC-60 switching system, the phone company can choose which one you get.
You cannot hear the following tones, but when your phone rings, the switching office sends the following signals to activate different types of 'ringing' sounds.

Decimonic ring: 20, 30, 40, 50Hz
Harmonic ring: 16-2/3, 25, 33-1/3, 50Hz
Synchromonic ring: 20, 30, 42, 54Hz

Cellular Phones Ring Tunes

If you are looking for ring tones for your cellular phone, please check here.