Gateway NV7802u - NV - Core 2 Duo 2.2 GHz Reference Manual page 28

To connect the optional modem:
1
2
22
CHAPTER 3: Setting Up and Getting Started
Insert one end of the modem cable into the
modem jack
Insert the other end of the modem cable into a
telephone wall jack.
Important
The modem will not work with digital or PBX telephone
lines.
on your notebook.