Adding and registering handsets/headsets/speakerphones
Your telephone can support up to 12 DECT 6.0 cordless handsets (AT&T model 
CL80115, sold separately) or up to ten cordless handsets and two cordless 
headsets or speakerphones (sold separately). Visit  
www.telephones.att.com/accessories for a list of compatible DECT 
6.0 cordless headsets and speakerphones. Each new handset, headset or 
speakerphone must be registered to the telephone base before use. You must 
register each handset, headset or speakerphone separately.
To register a cordless headset or speakerphone to this telephone system, 
please refer to the corresponding user’s manual 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. Both the handset and the telephone base show 
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). Both the handset 
and the telephone base beep 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
104