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4.3 Identifying Tones
142 User Manual
When Going Off-hook
Dial Tones
Tone 1
Normal
Tone 2
Any of the following features is
set:
• Absent Message
• Background Music
(BGM) (proprietary
telephone [PT] only)
• Call Forwarding
(FWD)
• Call Pickup Deny
• Data Line Security
• Do Not Disturb (DND)
• Extension Lock
• Hot Line (single line
telephone [SLT] only)
• Message Waiting (PT
only)
• Remote Extension
Lock
• Timed Reminder
[Czech Republic only]
Tone 3
• When going off-hook
with an SLT that has
messages waiting
• When Account Code
Entry is performed
• When answering a
call from Timed
Reminder
1 s
1 s
1 s
1 s