HP LaserJet 3150 All-in-One Printer series - Manual (Page 47)

EN Faxing using the software 45
Receiving faxes to your computer
To receive faxes to your computer, your computer must be directly
connected to the product and you must enable the Receive to PC
setting. (See the software Help for instructions.)
If your computer is off when faxes arrive, they are stored in the
HP LaserJet 3150 product memory and automatically upload to the
computer when you turn it on again.
There is a limitation to receiving faxes to the computer. If you have a
phone line receiving both fax and voice calls (a shared line) and an
answering machine or computer voicemail on the line, you must turn
off the answering machine or voicemail to receive faxes to the
computer. If you don’t, either the answering system answers all calls,
or the PC fax program does.
Because of this limitation, most users choose to receive faxes to the
HP LaserJet 3150 product.