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55
You can register up to four GAP 
compliant handsets to your 
BT3570 base to extend your 
phone system without needing 
to install telephone extension 
sockets for each new phone.
You have 2 minutes to complete 
the registration process.
If registration isn’t successful 
incase the base registration 
period ran out of time.
If there are already four 
handsets registered to the 
base, the registration will fail. 
You must de-register another 
handset before you can register 
the new one.
Using additional handsets
Registering an additional handset
If you bought your BT3570 as a multipack, all the 
handsets that came with it will be registered at the 
base. If you buy new handsets separately, you’ll 
need to register them before you can use them. 
You can register up to four handsets and have to 
complete the registration process in two minutes.
At the base:
1. Press and hold 
Find
 for 5 seconds. You now have 2 
minutes to register a handset.
At the handset:
1. Press 
, then press   until you see Advanced 
Set. Then press 
. 
2. Press 
 until Register is displayed. Press  . 
then press 
. When your handset is registered, it’ll 
be given a handset number.  
De-registering a handset 
1. Press 
, then press   to Advanced Set. Press  . 
2. Press 
 until you come to Unregister. Press  . 
3. Type your 4 digit PIN, then press 
.