The following table lists the component output frequencies supported by default, along with their corresponding identifiers (that may be used in calls to sm_add_output_tone().
| Id | Frequency | Amplitude | Description | 
|---|---|---|---|
| 0 | 0 | 0 | Silence | 
| 1 | 697 | -12 | DTMF frequency 1 | 
| 2 | 770 | -12 | DTMF frequency 2 | 
| 3 | 852 | -12 | DTMF frequency 3 | 
| 4 | 941 | -12 | DTMF frequency 4 | 
| 5 | 1209 | -10 | DTMF frequency 5 | 
| 6 | 1336 | -10 | DTMF frequency 6 | 
| 7 | 1477 | -10 | DTMF frequency 7 | 
| 8 | 1633 | -10 | DTMF frequency 8 | 
| 9 | 400 | -10 | Call progress 1 | 
| 10 | 450 | -10 | Call progress 2 | 
| 11 | 425 | -4.5 | Call progress 3 | 
| 12 | 950 | -13 | Call progress 4 | 
| 13 | 1400 | -13 | Call progress 5 | 
| 14 | 1800 | -13 | Call progress 6 | 
| 15 | 350 | -10 | Call progress 7 | 
| 16 | 440 | -10 | Call progress 8 | 
| 17 | 1100 | -11.5 | Fax CNG | 
| 18 | 2100 | -11 | FAX CED | 
| 19 | 350 | -13 | Call progress 1 | 
| 20 | 440 | -13 | Call progress 2 | 
| 21 | 440 | -19 | Call progress 3 | 
| 22 | 480 | -17 | Call progress 4 | 
| 23 | 480 | -19 | Call progress 5 | 
| 24 | 480 | -24 | Call progress 6 | 
| 25 | 620 | -24 | Call progress 7 | 
| Id | Frequency | Amplitude | Description | 
|---|---|---|---|
| 9 | 350 | -13 | Call progress 1 | 
| 10 | 440 | -13 | Call progress 2 | 
| 11 | 440 | -19 | Call progress 3 | 
| 12 | 480 | -17 | Call progress 4 | 
| 13 | 480 | -19 | Call progress 5 | 
| 14 | 480 | -24 | Call progress 6 | 
| 15 | 620 | -24 | Call progress 7 | 
| 16 | 1100 | -11.5 | Fax CNG | 
| 17 | 2100 | -11 | FAX CED | 
The following table lists the simple (single or dual component frequency) output tones supported by default and the corresponding identifiers (that may be used in calls to sm_play_tone()). Additional output tones may be defined by an application through calls to sm_add_output_tone()
| Id | 1st Component | 2nd Component | Description | 
|---|---|---|---|
| 0 | 4 | 6 | DTMF tone 1 ('0') | 
| 1 | 1 | 5 | DTMF tone 2 ('1') | 
| 2 | 1 | 6 | DTMF tone 3 ('2') | 
| 3 | 1 | 7 | DTMF tone 4 ('3') | 
| 4 | 2 | 5 | DTMF tone 5 ('4') | 
| 5 | 2 | 6 | DTMF tone 6 ('5') | 
| 6 | 2 | 7 | DTMF tone 7 ('6') | 
| 7 | 3 | 5 | DTMF tone 8 ('7') | 
| 8 | 3 | 6 | DTMF tone 9 ('8') | 
| 9 | 3 | 7 | DTMF tone 10 ('9') | 
| 10 | 1 | 8 | DTMF tone 11 ('A') | 
| 11 | 2 | 8 | DTMF tone 12 ('B') | 
| 12 | 3 | 8 | DTMF tone 13 ('C') | 
| 13 | 4 | 8 | DTMF tone 14 ('D') | 
| 14 | 4 | 5 | DTMF tone 15 ('*') | 
| 15 | 4 | 7 | DTMF tone 16 ('#') | 
| 16 | 9 | 0 | 400 Hz tone (busy/path) | 
| 17 | 9 | 10 | 400 Hz + 450 Hz (Ring) | 
| 18 | 11 | 0 | 425 Hz tone (E.C. dial/busy/unobtainable) | 
| 19 | 12 | 0 | 950 Hz tone (SIT) | 
| 20 | 13 | 0 | 1400 Hz tone (SIT) | 
| 21 | 14 | 0 | 1800 Hz tone (SIT) | 
| 22 | 15 | 16 | 350 Hz + 440 Hz tone (U.K. dial tone) | 
| 23 | 17 | 0 | fax CNG | 
| 24 | 18 | 0 | fax CED | 
| 25 | 19 | 20 | 350 Hz + 440 Hz (U.S. Dial) | 
| 26 | 24 | 25 | 480 Hz + 620 Hz (U.S. Line busy/Reorder congestion) | 
| 27 | 21 | 23 | 440 Hz + 480 Hz (U.S. Ring Tone) | 
| 28 | 22 | 0 | 480 Hz tone (Alarm/Intercept signal) | 
| Id | 1st Component | 2nd Component | Description | 
|---|---|---|---|
| 16 | 9 | 10 | 350 Hz + 440 Hz (U.S. Dial) | 
| 17 | 14 | 15 | 480 Hz + 620 Hz (U.S. Line busy/Reorder congestion) | 
| 18 | 11 | 13 | 440 Hz + 480 Hz (U.S. Ring Tone) | 
| 19 | 12 | 0 | 480 Hz tone (Alarm/Intercept signal) | 
| 20 | 16 | 0 | fax CNG | 
| 21 | 17 | 0 | fax CED |