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Acoustic signals
The following tones describe signaling for the PABX when using analog telephones.
Internal dial tone(421 Hz)
//___//___//________//___//___//________//___//_______//
You will hear this dial tone after lifting the handset for »calling external
parties with line access digit«. This signal indicates that you can dial a
number. After 40 seconds this signal changes to the busy signal; hang up
the handset and then lift it up again. You will then hear again the internal
dial tone.
Busy tone (421Hz)
//____//____//____//____//____//____//____//____//___//_
You will hear this signal, when the called external or internal extension is
busy.
Positive acknowledgement signal (mixed tone 421Hz und 320 Hz)
///////_________________________________________________
The positive acknowledgement signal indicates that your input has been
accepted.
Negative acknowledgement signal (mixed tone 421Hz and 320 Hz)
///___///___///___///___///___///___///___///___///___//
If you hear this tone, the selected function can not be used or the feature
has not been configured or has been canceled.
Internal ringing signal (421 Hz)
//////////_______________________________________///////
This signal indicates that the telephone of the external or internal extensi-
on is ringing.
Special dial tone (421 Hz and 316 Hz mixed)
//___//___//________//___//___//________//___//_______/
This signal indicates that your phone has been set for call rerouting.
External dial tone (425 Hz)
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A continuous signal that you hear when you have engaged the external
ISDN connection.
Call waiting tone (421 Hz)
//___//_____________//___//_____________//___//_________
Call waiting tone. This tone signals that an external party is calling you
during an ongoing call. The call waiting signal is sounded for a maximum
of 30 seconds.
Time intervals of the signals in seconds
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1 2 3 4 5
Safety notes
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