Siemens Hicom 150 H Operating Instructions Manual page 22

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It is important that you reach the called party, but the
number is busy.
Lift the handset.
Enter the internal station number.
Wait (approx. 5 seconds) until the busy tone is followed
by the ring tone.
The called party can then respond Æ page 7.
The called party can prevent automatic call wait-
ing Æ page 8.
If this feature is configured (consult system
support), you will hear the ring tone
immediately.