HP Officejet 6600 e-All-in-One Printer - H711a H711g - Manual (Page 187)

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 printer connected to the 1-LINE port on
the back of the printer
You might need to connect the supplied phone cord to the adapter
provided for your country/region.
5 DSL/ADSL modem
6 Computer
7 Answering machine
8 Telephone (optional)
NOTE: You need to purchase a parallel splitter. 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 (parallel phone systems) 183