3.5 SYSTEM TONES
TONE FREQUENCIES CADENCE
DIAL TONE 350 + 440 Hz CONTINUOUS
RINGBACK TONE 440 + 480 Hz 1 sec on + 3 sec off
DID RINGBACK TONE 440 + 480 Hz 2 sec on + 4 sec off
BUSY TONE 480 + 620 Hz 0.5 sec on + 0.5 sec off
DND/NO MORE CALLS 480 + 620 Hz 0.25 sec on + 0.25 sec off
TRANSFER/CONF 350 + 440 Hz 0.1 sec on + 0.1 sec off
CONFIRMATION TONE 350 + 440 Hz 0.05 sec on + 0.05 sec off
ERROR TONE 480 + 620 Hz 0.05 sec of tone 1/0.05 sec of tone 2
SYSTEM TONES
Intercom Dial Tone—A steady tone that indicates you can begin dialing.
Ringback Tone—Indicates the station you dialed is ringing.
Busy Signal—Indicates the station you dialed is busy.
DND/No More Calls Tone—Fast busy tone advises you the station you dialed is in the Do Not Disturb
mode or cannot receive any more calls.
DIAL TONE
RINGBACK TONE—1000 ms ON/3000 ms OFF
BUSY TONE—500 ms ON/500 ms OFF
DND/NO MORE CALLS TONE—250 ms ON/250 ms OFF
CONTINUOUS
CONTINUOUS
CONTINUOUS
FOR TEN SECONDS
3.3
