AT&T CL80119 User Manual page 15

Registration and deregistration
Adding and registering handsets
If the registration fails, the system will automatically try to register
again. If registration fails after the third try, Registration Failed
appears on both screens. The handset shows To register HS, see
manual and the telephone base returns to idle mode. This may
take up to five minutes to occur. Please start again from Step 1.
Notes:
You cannot register a handset if any other system handset is in use.
f f
You can only register one handset to the telephone base at a time.
f f
11