Zoom ZoomAir IG-4150 Installation Reference Manual page 22

Internet Access via Telephone Line
If you want to access the Internet over a telephone line, the
procedure for configuring your IG is as follows:
1
In the Setup your Internet Connection screen, select
Telephone Line under Internet access via. The screen
changes as follows:
In the Disconnect if idle for drop-down menu, your options
range from 1 to 40 minutes. Under Dial using, you can select
Tone or Pulse. Finally, you can select automatic dialing. Click
Continue.
For additional information, click the Help button.
22 ZoomAir IG-4150 Installation Guide & Reference Manual