|
Tone | Frequency (HZ) | Pattern (ms) | | | |
Answer Back 3 | 2225 | 3000 on | Answer Back 5 | 2225
| 5000 on | Bridging Warning | 440 | 1750 on, 12000
off, 650 on; repeated | Reorder (Local) | 480 & 620 | 3000 on, 2000
off | Invalid Number | 200 & 400 | | Hang Up Warning | 1400
& 2060 | 100 on, 100 off | Hang Up | 2450 & 2600 |
| Busy | 480 + 620 | 500 on, 500
off; repeated | + Call Waiting | | | - Internal | 440 |
200 on | - External | 440 | 200 on, 200 off | - Attendant | 440 | 200 on, 200 off |
Priority Call | 440 | 200 on, 200 off, 200 on, 200 off, 200 on | + Call Waiting | | | - Ring Back (Normal) | 440 +
480; 440 | 900 on (440 + 480) 200 on (440) 2900 off; repeated | - Ring Back (PBX) | 440 & 480 | 1500 on, 4500 off
| + Cnrt Att Call | | | - Incoming Call Identification | 480
& 440 & 480 | 100 on (480), 100 on (440), 100 on silence |
- Dial Zero, Attendant Transfer, Test Calls | 440 | 100 on, 100 off, 100
on | - Coverage | 440 | 600 on | - Confirmation | 350 + 400 | 100 on, 100 off, 100 on,
100 off, 100 on | - Dial | 250 + 400 | Continuous | - Executive Override | 440 | 300 on followed by | - Intercept | 440 & 620 | 250 on (440), 250
on (620); repeated | - Ringback | 440 + 480 | 1000
on, 3000 off; repeated | - Zip | 480 | 500 on | |