HP Officejet Pro L7380 All-in-One Printer - Manual (Page 125)

When the phone rings, your answering machine answers after the number of rings you
have set, and then plays your recorded greeting. The device monitors the call during
this time, "listening" for fax tones. If incoming fax tones are detected, the device emits
fax reception tones and receives the fax; if there are no fax tones, the device stops
monitoring the line and your answering machine can record a voice message.
Shared voice/fax line with computer DSL/ADSL modem and answering machine
1 Telephone wall jack
2 Parallel splitter
3 DSL/ADSL filter
4 Phone cord provided with the device connected to the 1-LINE port on
the back of the device
5 DSL/ADSL modem
6 Computer
7 Answering machine
8 Telephone (optional)
NOTE: You will need to purchase a parallel splitter (also called a coupler). A
parallel splitter has one RJ-11 port on the front and two RJ-11 ports on the back.
Do not use a 2–line phone splitter, a serial splitter, or a parallel splitter which has
two RJ-11 ports on the front and a plug on the back.
Set up faxing for the device (some models only) 121