Siemens 120 Series Quick Reference Manual page 8

Sounds
Your phone makes different sounds to let you know what's
going on. Rings occur on a line that you are not using to indicate
that you have an incoming call. Tones occur while you are using
your phone and provide information about calls and features.
Table 2. Rings
Sound
Single (repeated)
Double (repeated)
Triple (repeated)
Table 3. Tones
Sound
Busy tone
Dial tone
Fast busy tone
Short tone every 20
secs.
3 short tones (confir-
mation tone)
3 short tones followed
by dial tone
2 short tones every 20
secs.
Wavering (error) tone
4
Meaning
Internal or Emergency
call
External call
Callback
Meaning
The party you called is
on the phone.
You can make a call or
invoke a feature.
Invalid call
Internal call waiting
A feature has been suc-
cessfully activated.
Additional input, such
as a PIN, is required.
External call waiting
Invalid feature request