3-3
System Tones
CADENCE
(Milliseconds)
TONE
On
Off
On
Off
DIAL TONE
A steady tone that indicates you can begin dialling
CONTINUOUS
RINGBACK TONE
The station you dialled is ringing
400 200 400 2000
DDI RINGBACK TONE
Ringback tone heard by external party when dialing DDI
number
1000 3000 1000 3000
BUSY TONE
The station you dialled is busy
350 350 350 350
DND/NO MORE CALLS
Fast busy tone tells you the station you dialled is in the Do
Not Disturb mode or cannot receive any more calls. (Rings
for 10 secs)
250 250 250 250
TRANSFER/CONF
Your call is being held and you can dial another party.
100 100 100 100
CONFIRMATION / BARGE IN TONE
Very short beeps followed (after 2 seconds) by dial tone
indicate you have correctly set/cancelled a system feature or
set a barge in with tone
50 50 50 50
ERROR TONE
A distinctive two-level beeping tone followed (after 2
seconds) by dial tone indicates you have done something
incorrectly. Try again.
100 100 100 100
MESSAGE WAITING
A message waiting indication has been left at the SLT station
CONTINUOUS
HOLD / CAMP-ON
Call on hold or camped on
500 3500 500 3500
RING
Ring over page
1000 3000 1000 3000
C.O. BUSY
C.O. line is busy
350 350 350 350
C.O. RINGBACK
C.O. line is ringing
400 200 400 2000
C.O. DIAL
C.O. line dialling tone
1000 250 1000 250