Siemens gigaset 4010 Operating Instructions Manual page 63

Operating more than one handset
Press keys:
62
Using Walk and Talk mode
Two handsets are set to Walk and Talk mode:
Calling handset:
&DOO
Press.
Called handset:
The call is indicated by a message on the display.
6LOHQW
Deactivate ring tone.
!
Press.
The two handsets are interconnected.
Paging
Press the key on the underside of the base station very
briefly – all handsets ring at the same time ("Paging").
End paging:
Press the key on the underside of the base station very
briefly or press the talk key
!
on a handset.