Lexmark 436 - Manual (Page 85)

d Press the arrow buttons until Distinctive Rings appears, and then press .
e Press the arrow buttons until the desired ring tone appears, and then press .
Connecting the printer and a telephone or answering machine to the same
telephone line
1 Connect one end of the telephone cable that came with the printer to the printer LINE port .
2 Connect the other end of the telephone cable to an active analog telephone wall jack .
3 Remove the plug from the printer EXT port .
4 Connect your telecommunications equipment directly to the printer EXT port .
Use one of the following methods:
Answering machine
Faxing 85