Call
Depending on the situation or personal preference, calls can be made using the handset, the integrated microphone/speaker or a headset (optional accessory).
*Note: In permanently noisy environments, it makes sense to switch off the sidetone in the handset (in the phone: Settings > Sound > Handset sidetone).
*Further help under Hands-free calling mode
*Further help under Loudspeaker listening mode
*Further help under Headset mode
Information about a Call 
During a call, you see information about the call and your call partner on the screen, as well as general time information (date and time).
DTMF signals 
The selected numbers and characters are displayed in the screen for some seconds and you can hear the associated sound.
*Description of the operation under Call
Accepting a call 
A call that has been taken on a different internal phone can be picked up, provided that call pick-up has been permitted on the PBX for the subscriber that is being called.
*Description of the operation under Pickup
This function is useful, for example, in the case of answering machines.
*Description of the operation under Call
Ending a call 
When your call partner ends the call, your phone goes into its idle state. If you hang up the receiver, you will hear the busy signal through the base unit loudspeaker if the receiver has been hung up incorrectly.
*Note: If you want to end the current call, and then immediately make a new call, press the soft key End and then start dial the next number.
*Description of the operation under Call