Panasonic KX-TG2563F - Manual (Page 58)

58
Adding Another Phone
This unit will not function during a power failure. To connect a standard
telephone on the same line, use the Panasonic T-adaptor KX-J66.
To order, call the accessories telephone number on page 2.
T-Adaptor (KX-J66)
Single-Line
Telephone Jack
Telephone
Line Cord
Standard Telephone