Appendix

Acoustic signals

Internal dial tone

3 x 0.2s tone and 0.3s pause, sequence repeated after 0.5s pause.

External dial tone

Steady tone

Ringing tone

Tone

 

Pause

 

Tone

 

Pause

 

Tone

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.8s 2s

Busy tone

0.5s 0.5s

Acknowledgement tone

Tone

0.8s

Error tone/range tone

4x0.1s

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Siemens 300E operating instructions Acoustic signals