Bosch Integral TH13 Operating Instructions Manual page 108

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Other display messages
The telephone loudspeaker is on.
The loudspeaker and microphone are on (handsfree mode).
Call waiting. Press the "Interchange" key to switch to this subscriber.
Busy
The dialed number is busy.
Call
You are receiving a call.
Callback not possible
Callback is not possible.
Call diversion not possible
The function has not been enabled in the system for your phone.
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Display messages "