RCA 25205 - Manual (Page 59)

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If you have two telephone lines installed on a single jack, plug one end of the straight
telephone line cord into the jack marked LINE 1+2 on the back of the base. Plug the other
end into the 2-line wall jack.
If you have two separate telephone line jacks, plug one telephone line cord into the jack
marked LINE 1+2 and another cord into the jack marked LINE 2. Plug the other end of
each line cord into separate wall jacks.
Connections and Setup
NOTE: To use two lines, you must have two telephone lines with unique telephone numbers. If you only
have one telephone line, this phone will still operate, but only as a single line telephone.
6. Connect the handset cord:
Plug one end of the coiled handset cord into the side of the base and the other end into
the jack on the handset, and place the handset in the cradle.
7. Check for a dial tone. Lift the handset and listen for a dial tone. If you hear a dial
tone, the phone is properly installed.
Data Port
This phone has a DATA PORT jack to connect an auxiliary phone device, such as a fax
machine, computer modem, answering system, or even a cordless phone.
The DATA PORT switch on the back of the phone controls the DATA PORT jack so you can
choose line 1 or line 2.