Appendix
85
Adding and registering handsets/headsets
Your telephone can support up to 12 DECT 6.0 cordless handsets (AT&T model 
CL80111, 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 the telephone base
Before you begin registration, put the handset you wish to 
register near the telephone base. Make sure the handset 
shows To register, see manual. 
On the telephone base, press MENU/SELECT in idle mode.
On the telephone base, use qCID or pDIR to scroll to 
>Settings, then press MENU/SELECT.
On the telephone base, use qCID or pDIR to scroll to 
>Registration, then press MENU/SELECT. 
Press # (pound key) on the handset. Both the handset  
and the telephone base show Registering... Please wait 
and the IN USE light turns on. 
After a while, Both the handset and the telephone base 
beep and the IN USE light turns off. Handset Registered 
shows on both the handset and telephone base. 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 both 
screens before returning to idle mode. This may take up to five minutes  
to occur. Please start again from Step 1 above.
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. 
1.
2.
3.
4.
5.
6.
•
•
 
 
 
To register, 
see manual
 
 
 
Registering...
Please wait
 
 
 
Handset 
Registered