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Add and register handsets/headsets/speakerphones
Your telephone can support up to 12 DECT 6.0 cordless handsets (AT&T 
model CLP99007, sold separately) or up to 10 cordless handsets and 2 cordless 
headsets and 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 the following.
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
Method 1:
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. If the registration is 
successful, both the handset and the telephone base screens display 
HANDSET X Registered (HANDSET represents the handset name,  
X represents the handset number). Both the handset and the telephone 
base beep. The handset is now registered with the telephone base.
Appendix 
For registration, put the handset on the 
telephone base, not the handset charger.