Telephone Functions & Frequencies
http://www.qrc-innovation.com/
| TouchTone Dial Frequencies |
| All Frequencies in Hertz |
| --- |
1209 |
1336 |
1477 |
1633 |
| 697 |
1 |
2 |
3 |
A |
| 770 |
4 |
5 |
6 |
B |
| 852 |
7 |
8 |
9 |
C |
| 941 |
* |
0 |
# |
D |
| TouchTone Functions & Frequencies |
| All Frequencies in Hertz |
| Function |
Frequencies |
Duration (Seconds) |
| Dial Tone |
350/400 |
Steady |
| Busy Signal |
480/620 |
0.5on/0.5off |
Toll
Congestion |
480/620 |
0.2on/0.3off |
Ringback
Normal |
440/480 |
2.0on/4.0off |
Ringback
PBX |
440/480 |
1.5on/4.5off |
Reorder
Local |
480/620 |
3.0on/2.0off |
HangUp
Warning |
1400/2060 |
0.1on/0.1off |
HangUp
Normal |
2450/2600 |
--- |
CoinDrop
5 Cents |
1700/2200 |
66msOn x 1 |
CoinDrop
10 Cents |
1700/2200 |
66msOn/66msOff/66msOn |
CoinDrop
25 Cents |
1700/2200 |
33msOn/33msOff x 5 |
| Coin Collect |
700/1100 |
--- |
RingBack
Coin |
700/1700 |
--- |
| Coin Return |
1100/1700 |
--- |
| Capture Line |
2600 |
90msOn/60msOff/900msOn |
KP1
A key |
697/1633 |
--- |
KP2
B Key |
770/1633 |
--- |
ST
C Key |
852/1633 |
--- |
KP2E
D Key |
941/1633 |
--- |
C11
CCITT |
700/1700 |
--- |
C12
CCITT |
900/1700 |
--- |
KP1
CCITT |
1100/1700 |
--- |
KP2
CCITT |
1300/1700 |
--- |
ST
CCITT |
1500/1700 |
--- |
EO
CCITT |
2100 |
--- |
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PO Box 498
Hayden ID 83835-0498 USA
Quality Research Company
Last Updated: August 25, 2005