Appendix C - DTMF and MF Tone Specifications

Table 23. DTMF Tone Specifications

Code	Tone Pair Frequencies (Hz)	Default Length (ms)
1	697, 1209	100
2	697, 1336	100
3	697, 1477	100
4	770, 1209	100
5	770, 1336	100
6	770, 1477	100
7	852, 1209	100
8	852, 1336	100
9	852, 1477	100
0	941, 1336	100
*	941, 1209	100
#	941, 1477	100
a	697, 1633	100
b	770, 1633	100
c	852, 1633	100
d	941, 1633	100

Table 24. MF Tone Specifications (CCITT R1 Tone Plan)

Code	Tone Pair Frequencies (Hz)	Default Length (ms)	Name
1	700, 900	60	1
2	700, 1100	60	2
3	900, 1100	60	3
4	700, 1300	60	4
5	900, 1300	60	5
6	1100, 1300	60	6
7	700, 1500	60	7
8	900, 1500	60	8
9	1100, 1500	60	9
0	1300, 1500	60	0
*	1100, 1700	100	KP
#	1500, 1700	60	ST
a	900, 1700	60	ST1
b	1300, 1700	60	ST2
c	700, 1700	60	ST3
The standard length of a KP tone is 100 ms.

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