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56
If there are already five 
handsets registered to the 
base, the registration will fail. 
You must de-register another 
handset before you can register 
the new one, see “Delete  
a handset” on page 51  
for instructions.
The default 4 digit system  
PIN is 0000.
If you enter a digit incorrectly, 
select 
 to delete it.
You have 2 minutes to complete 
the registration process.
If registration isn’t successful 
the first time, please try again 
incase the base registration 
period ran out of time.
You can register up to five GAP compliant handsets 
to your BT3920 base to extend your phone system 
without needing to install telephone extension 
sockets for each new phone.
If you’ve bought a BT3920 multiple pack, all 
additional handsets come pre-registered to the 
base. However, if you purchase an additional 
handset separately, you must register it to your 
BT3920 base (as shown on Page 6) before it can 
be used. If a handset becomes un-registered it will 
need to be registered to the base again.
Register an additional handset
1. Select Menu, scroll 
Vol.
Calls
 to select the base you want and 
select  .
3. 
Enter
 
PIN
 is displayed. Enter the 4 digit system PIN 
and select 
. The handset will display 
Please
 
wait
. 
4. Press and hold the   button on the base for 
approximately 5 seconds until you hear a long beep 
and the green In use light begins to flash.
5. Once registration is successful the handset will 
display 
Handset
 
x
 (with x being the assigned next 
available handset number). 
Using additional handsets