Appendix

Audio Signals / Ringer Cadences

The following diagram shows the duration and intervals of the individual audio sig- nals and ringer cadences.

Audio signals

0 1 2 3 4 5 6

Time in seconds

Ring tone

Busy tone

Internal dialling tone

External dialling tone

Positive acknowledgement tone

Negative acknowledgement tone

Internal special dialling tone

External special dialling tone

Call-waiting tone

Rings

External call

Internal call

Recall

105

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Deutsche Telekom 704PC manual Audio Signals / Ringer Cadences