Voice API Programming Guide — June 2005 177
R2/MF Signaling
15.4 R2/MF Signal Meanings

There are two groups of meanings associated with each set of signals. Group I meanings and Group

II meanings are associated with the 15 forward signals. Group A meanings and Group B meanings

are associated with the 15 backward signals. See Figure23.

13 1620 1980 SIGI_13 SIGII_13 113
14 1740 1980 SIGI_14 SIGII_14 114
15 1860 1980 SIGI_15 SIGII_15 115

Table22. Backward Signals, CCITT Signaling System R2/MF tones

R2/MF TONES INTEL INFORMATION
Tone Nu mbe r Tone Pair
Frequencies (Hz) Group A Define Group B Define
1 1140 1020 SIGA_1 SIGB_1
2 1140 900 SIGA_2 SIGB_2
3 1020 900 SIGA_3 SIGB_3
4 1140 780 SIGA_4 SIGB_4
5 1020 780 SIGA_5 SIGB_5
6 900 780 SIGA_6 SIGB_6
7 1140 660 SIGA_7 SIGB_7
8 1020 660 SIGA_8 SIGB_8
9 900 660 SIGA_9 SIGB_9
10 780 660 SIGA_0 SIGB_0
11 1140 540 SIGA_11 SIGB_11
12 1020 540 SIGA_12 SIGB_12
13 900 540 SIGA_13 SIGB_13
14 780 540 SIGA_14 SIGB_14
15 660 540 SIGA_15 SIGB_15

Table21. Forward Signals, CCITT Signaling System R2/MF tones (Continued)

R2/MF TONES INTEL INFORMATION
Tone Nu mbe r Tone Pair Frequencies
(Hz)
Group I
Define
Group II
Define
Tone Detect.
ID