Radio Shack CID-2904 - Manual (Page 15)

15 Preparation
For a Two-Line Phone and Two Single-
Line Phone Jacks
For a Single-Line Phone and a Two-
Line Phone Jack
For Two Single-Line Phones and a
Two-Line Phone Jack
Two-Line Phone Line 2 Line 1
Caller ID
One-Line Phone
Line 1/Line 2
Caller ID
Phone Two Line 1/Line 2
Caller ID
Phone One