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If you cannot register the handset then here are some possible causes and solutions for them.
Cause 1:The handset and the base station were not prepared for registration.
Solution: Unplug and then plug in the power adapter.
Cause2:The handset or the base station has not been entered into registration mode.
Solution: See User Manual for correct registration of base station and handset.
Cause3:The base station is registered full.
Solution: Press [Page Key] on the base station to page the registered handsets,
then perform the deregistration operation. Finally, register the
handset you want to use.
Here is few more of additional info. if you want:
Register the Handset to the Base
Place the accessory handset in the base station of the system. For some
simple systems this may be all you need to do to register the new
handset. If so, the LCD screen will read "Registration Complete." Step 2:
Press the "menu" button on the base station, scroll down to "register handset" and press "ok."
Press and hold either "#" or "OK" (depending on the brand) on your
handset until your hear the indicator tone. At this time the LCD should
confirm the handset is registered.
Reset Handsets with the Base
Clear the registration information from the base if you want to register your handset to a new base.
Hold  and [#] down on the base for a minimum of 5 seconds or until the "System Reset" menu appears.
Choose the "deregister" option from the menu and scroll down to the handset you wish to remove.
Press "OK" to de-register the correct handset. Press "yes" when you are
asked if you are sure, and wait for the confirmation tone.
Reset Handsets without the Base
Hold  and [#] down on the phone for a minimum of 5 seconds until the "System Reset" menu appears.
Choose the "base unavailable" menu, select "yes" and press the "OK" button.
Goodluck, Please don't forget to rate the solution.
With vtech phone (many times) a beeping handset indicates a low battery or an inability to connect to base station. check to make sure the battery is connected correctly and that the phone is setting in its docking station correctly. (remover and obstructions that would prevent correct charging) If this fails go to your local store that sells batteries for cordless phones and purchase to correct type.
if you disasembled the phone to clean it, check the flex cable and see if it is all the way on, also use some epc (electrical parts cleaner) on all the contacts including the male and female ends of all the flex cable. this promotes proper connection of contacts. just be sure to completley blow dry it before sending a charge through the circuitry
HELLO . AM JAMAL FROM SYRIA , I VE THE SAME PROBLEM WITH THREE PREVIOUSLY USED XALIO 300 WHICH I BOUGHT FROM SOME BLACK MARKET. I SUGGEST U TO INSERT THE CODE ACCORDING TO UR COUNTRY , FOR EXAMPLE :
PRESS FIRST " R " BUTTON THEN 99 THEN " RC " CODE WRITTEN UNDER BASE UNIT THEN " R " OR " PAGING " AT THE LOW RIGHT CORNER OF HANDSET .