The process is called "Registering."
From another fixya post:
1. Make sure to charge the handset battery pack at least 12 hours.
2. Using the soft keys on the base located below the base screen, press MENU.
3. Use the up or down arrow keys to select DISPLAY BASE ID.
4. Press OK. The base screen will display the 15-digit Base ID
code for about 30 seconds, then the unit returns to the idle
screen. Write down the Base ID code on a piece of paper.
5. At the cordless handset, use the soft key to select NEW.
6. Enter the 15-digit Base ID code using the number keypad.
7. Use the soft key to select OK. The screen displays PLEASE
WAIT!.
8. After about 45 seconds, the screen displays FOUND BASE. If the handset displays BASE BUSY TRY LATER, the base is in
use.
If all of your handset addresses have been "used up" you may need to do a factory reset and re-register All of your handsets.
Go to for instructions to do a factory resethttp://ostermiller.org/vtech_deregister_...
This procedure works on the 5831, and 5870 (and possibly the 5840)
Remove the spare battery (if any) and handsets from the base station.
Navigate in the menus to the "base settings". Your screen should say "ringer volume, ringer melody, keypad tone, tone/pulse, ..."
Punch in the reset code (including the stars): **335782
Wait for the phone to restart itself (about 5 seconds).
Re-register all of your handsets.
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