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Adding and registering handsets/headsets/
speakerphones
Your telephone can support up to 12 DECT 6.0 cordless handsets (AT&T model
CL80107, sold separately), or up to 10 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 or 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, put the handset you wish to register near the 
telephone base. Make sure the handset shows To register 
HS, see manual.. 
2.  On the telephone base, press MENU/
SELECT in idle mode.
3.  On the telephone base, use 
CID or DIR to scroll to 
Settings, then press MENU/SELECT.
4.  On the telephone base, use 
CID or DIR to scroll to 
Registration, then press MENU/SELECT. 
5.  Press # (pound key) on the handset. Both the handset  
and the telephone base show Registering... Please wait 
and the IN USE light on the telephone base turns on. 
6.  Aer a while, both the handset and the telephone 
base beep and the IN USE light turns o. HANDSET X 
Registered shows on both the handset and telephone base 
(HANDSET represents the handset name, X represents the 
handset number). The handset is now registered with the 
telephone base.
If registration fails, Registration failed appears on the handset screen. The 
handset then shows To register HS, see manual. and the telephone base 
returns to idle mode. This may take up to ve minutes to occur. Please start 
again from Step 1.
Notes: 
 You cannot register a handset if any other system handset is in use.
 If you try to register more than 12 handsets to the telephone base, the telephone base shows Registration slots are full 
and sounds two beeps. 
Appendix
 
 
To register HS,
see manual.
 
 
Registering...
Please wait
 
 
HANDSET X
Registered