Sounds
Your telephone makes different sounds to indicate what is
going on. Rings occur on free lines, indicating an incoming call.
Tones occur while you are using your telephone and provide
information about calls and features.
Sound
Single (repeated)
Double (repeated)
Triple (repeated)
Sound
Busy tone
Dial tone
Fast busy tone
Short tone every 20 sec.
3 short tones (confirmation
tone)
3 short tones followed by dial
tone
2 short tones every 20 secs.
Wavering (error) tone
16 Optiset E QRG
Table 1: Rings
Meaning
Internal call
External call
Callback
Table 2: Tones
Meaning
The party you dialed is on the
telephone.
You can make a call or invoke a
feature.
Invalid call.
Internal call waiting.
A feature has been successfully
activated.
Additional input, such as a PIN,
is required.
External call waiting.
Invalid feature request.