Sony PCV-RS321 - Manual (Page 143)

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 143