How to register the Gigaset S79H & S810H Additional Handset (Click here for a video.):
1 On the main phone base (the one connected to the phone socket), press and hold the paging button for 5 seconds until the base beeps. The base is now in registration mode.
The next steps must be finished within 60 seconds.
2 On the handset you want to register (it may show "No Base" on the screen), please press the right side of the navigation button, the handset will enter MENU.
3 By pressing the navigation button up or down, please the spanner icon ("Settings") and confirm by pressing "OK"
4 By pressing the navigation button up or down, please select "Registration" and confirm by pressing "OK"
5 By pressing the navigation button up or down, please select "Register Handset" and confirm by pressing "OK".
The handset will now ask for a System PIN. Using the phone keypad please enter "0000" and press "OK" to confirm.
6 The phone will now show "Searching for a base that's in registration mode" and after a few seconds will announce "Handset is registered" and will return to the main screen. You may now start using your handset.