Adding Another Phone - Panasonic KX-T4550-B Operating Instructions Manual

Adding Another Phone
This unit will not function during a power failure. To connect a standard
telephone on the same line, use a Panasonic T-adaptor KX-J66. (To order,
call 1-800-332-5368.)
Standard Telephone
Single-Line
Telephone Jack
Telephone Line
| Cord
YE
T-Adaptor
(KX-J66)