How to register the BT2500 Additional Handset:
1 On the handset which needs to be registered you may see a message on the display asking if you want to 'Register handset?' Please press the tick button as highlighted above to start registration.
2 On the base station of your BT 2500 (the main unit, which is connected to the phone socket), press and hold the 'Find' button for 5 seconds until the base beeps. The base is now in registration mode.
3 The handset will display the message 'Press & hold Find on base'; press the tick button if you have completed step 2.
4 The handset will display the message 'Registering handset...' and will then confirm registration (it can take up to 60 seconds).