elmeg C46e Description And Installation page 13

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1.6.2 Dial tones
The following dial tones describe signaling for the PABX system when
telephones are used.
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Internal dial tone (440 Hz)
Internal dial tone. After lifting the receiver of your phone, you will hear this dial
tone signaling that you are free to make a call. After 30 seconds this tone
changes to the busy signal. Replace the receiver and lift it up again. You will
again hear the internal dial tone.
//____//____//____//____//____//____//____
Busy signal and negative acknowledgement signal (440 Hz)
Busy signal. When you hear this signal the external or internal subscriber you
are calling can not be reached.
Negative acknowledgement signal. When you hear this signal the function
you have selected can not be used, or the feature has not been configured or
has been deleted.
//////////________________________________
Acknowledgement signal (440 Hz)
This signal indicates that your entry has been accepted.
Time intervals of the signals
/////_____/////_____/////_____/////_____/////
0,5s 1s 1,5s 2s 2,5s 3s 3,5s 4s
//////////______________________________///
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