AT&T CDLS 2300 - Manual (Page 5)

Compatibility
This AT&T 2300 expansion handset is compatible with the AT&T 2320,
2325, 2355 and 2365 telephones. You may add up to three expansion
handsets to your compatible telephone, for a total of four handsets.
If you try to install a fifth handset, registration will be blocked.
About Handset Registration
Each expansion handset must be individually registered with
your AT&T 2320, 2325, 2355 or 2365 base. Registration happens
automatically when you place this handset
fully charged into your
current base.
(See INSTALLATION beginning on page 3).
The original handset that came with the base is automatically registered
as Handset 1. Additional handsets will be assigned Handset 2, Handset 3
and Handset 4. You can rename the handsets by following the directions
under “Handset Name” in the FEATURE SETUP section of your base
telephone User’s Manual.
2
BEFORE YOU BEGIN BEFORE YOU BEGIN