What is This Tone?
When you make calls
Busy Tone
CCBS Tone
The called party on an ISDN line is
busy.
Reorder Tone
• The outside line you tried to seize is
not assigned or denied.
• The wrong account code was entered.
Ringback Tone
Do Not Disturb Tone
The dialed extension is refusing
incoming calls.
While off-hooking
Indication Tones
Tone 1
Call Waiting tone (default)
Tone 2
Call Waiting tone from outside
Tone 3
Call Waiting tone from another
extension
Tone 4
A call is held for more than a
specified time (default: 60 seconds).
When talking to an external party
Warning Tone
This tone is sent 15, 10 and 5
seconds before the time limit.
6-18
Appendix
1 s
5 s
1 s
15 s
15 s