English Owners Manual
Page 26
... standby, press the MENU soft key. 2) Move the cursor to the base. If REGISTRATION FAILED appears, please try these steps again. Registering TCX905 Accessory or Extra Handsets If you purchase an accessory handset, you need to register the handset before you can be registered at a time. If REGISTRATION FAILED. Only one handset can register it to a new base.
... standby, press the MENU soft key. 2) Move the cursor to the base. If REGISTRATION FAILED appears, please try these steps again. Registering TCX905 Accessory or Extra Handsets If you purchase an accessory handset, you need to register the handset before you can be registered at a time. If REGISTRATION FAILED. Only one handset can register it to a new base.