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Adding and registering handsets/headsets
Your telephone can support up to 12 DECT 6.0 cordless handsets (AT&T model 
CL80103, 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 HANDSET 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 above.
Appendix 
 
 
 
Registering...
Please wait
 
 
 
HANDSET X
Registered
 
 
 
To register HS,
see manual.
For registration, put the handset 
on the telephone base, not the 
handset charger.