Siemens OpenStage15 User Manual page 41

Step by step
Pickup call?
Ignore?
Picking up a group call
The pop-up menu opens:
l
Confirm.
or
^
Lift the handset (only if the appropriate function is set
by your service personnel)
or
R
Press the sensor key with the "Call pickup" function or
press it again if call answering was initiated via the key.
The speakerphone function is activated.
Ignoring a group call
f
Select and confirm the option shown. The phone stops
signaling the group call.
Basic functions
41