Siemens Gigaset 2420 System User Manual page 28

Desk Station
Line keys flash for each call, but the display shows only caller information for the last call. Press a line key to pick a specific call
or press the SPEAKER/MUTE key or pick up the corded handset to answer the last call. The display updates to reflect the
information of the current active line.
Terminating Calls
At the Desk Station
On the desk station, terminate a call by pressing the REL key or hanging up the handset End an active speaker call by pressing
the REL key, or by picking up the handset and replacing it on the desk station.
On the Cordless Handset
On the cordless handset, terminate a call by pressing the END key, the RELEASE key, or placing
the handset in the charger cradle.
If you are talking to someone and you have a call on hold, pressing the END key will disconnect both calls. Pressing the
RELEASE key disconnects the active party and automatically reconnects you to the person on hold.