RCA 25204 Guia Del Usuario página 10

Connections and Setup
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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.
NOTE: To use two line, 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.
5. 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.
6. 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.

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