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Your telephone can support up to 12 DECT 6.0 cordless handsets (AT&T model 
CRL30102, sold separately) or up to 10 cordless handsets and 2 cordless 
headsets (sold separately). Visit www.telephones.att.com/headsets 
for a list of compatible DECT 6.0 cordless headsets. Each new handset or 
headset must be registered to the telephone base before use. You must 
register each handset or headset separately.  
To register a cordless headset to this telephone system, please refer to the 
user’s manual of the cordless headset for more details. To register a cordless 
handset, see below.
The handsets provided within your product box are already registered as 
HANDSET 1, and so forth. Additional handsets are assigned numbers in the 
sequential order they are registered (up to HANDSET 12). 
Register a handset to your telephone base
1. Before you begin registration, make sure the handset is  
out of the telephone base or charger and shows To 
register HS, see manual.
2.
 Put the handset you wish to register on the telephone 
base cradle.
3. The screen shows Registering... Please wait and the  
IN USE light turns on. It takes up to 90 seconds to 
complete registration. Then, HANDSET X Registered 
appears on the screen, with X being the handset 
number (1-12). The handset beeps and the IN USE 
light turns off. The handset is now registered with the 
telephone base.  
If registration fails, the system will automatically try 
to register again. If registration fails after the third try, 
Registration failed appears on the screen for a few 
seconds, and then To register HS, see manual. This may 
take up to five minutes to occur. Please start 
again from Step 1.
Appendix
Adding and registering handsets/headsets
HANDSET    2
10/20
10:30
PM
Registering...
Please wait
To register HS,
see manual
For registration, put the handset 
on the telephone base, not the 
handset charger.