Adding and registering handsets/headsets
Your telephone can support up to 12 DECT 6.0 cordless handsets (AT&T model 
CL80113, sold separately) or up to ten cordless handsets and two 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 the 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 handset shows Registering... Please wait and the 
IN USE light on the telephone base turns on. HANDSET 
X Registered appears on the handset screen ((HANDSET 
represents the handset name, X represents the handset 
number). The handset beeps and the IN USE light turns off. 
The handset is now registered with the telephone base.
 
 
 
To register HS,
see manual.
 
 
 
Registering...
Please wait
 
 
 
HANDSET X
Registered
Appendix
73
For registration, put the handset on the 
telephone base, not the handset charger.