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- The frequencies for DTMF and C5 is as follow (public information):
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- DTMF:
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- 1209 1336 1440 1632
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- 697 1 2 3 A
- 770 4 5 6 B
- 852 7 8 9 C
- 940 * 0 # D
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- C5:
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- 700 900 1100 1300 1500 1700
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- 700 XXXX 1 2 4 7 C11
- 900 1 XXXX 3 5 8 C12
- 1100 2 3 XXXX 6 9 KP
- 1300 4 5 6 XXXX 0 KP2
- 1500 7 8 9 0 XXXX ST
- 1700 C11 C12 KP KP2 ST XXXX
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- Clear Forward: f1+f2 Continious (Send until ack(f1+f2) rec)
- Clear Back: f1
- Forward Transfer: f2
- Connection Signal:f2
- Seize: f1 Continious (Send until ack (f2) rec)
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- Where f1 is 2400 Hz and f2 is 2600 Hz.
- Generally between 1 and 5 % tolerance.
- Timings for dialling: Officially 66 ms tone, then 66 ms delay.
- Generally HIGH tolerance.
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