Activating via the receiver during a call:
Press the speaker key and put down the receiver .
The key is lit up while the function is activated.
In speaker mode, you hear the caller via the speaker.
Deactivating speaker mode during a call:
Lift the receiver and continue the call via the receiver.
During the call, press the speaker key. You will hear the caller via the speaker and the receiver, but only the microphone of the receiver will be active.
You should tell your caller if you have activated the speaker.