Sony PCV-RX850 - Manual (Page 96)

How do I change my modem to rotary or Touch-Tone dialing?
1. Click Start in the Windows taskbar, then click Control Panel.
2. Click Printers and Other Hardware, then click Phone and Modem options.
3. From the Dialing Rules tab, click Edit. The Edit Location dialog box appears.
4. Select the Tone or Pulse option. Click OK.
Page 96