Skip navigation

JSI Tip 0234 - If your communication device is not supported by Unimodem but it is/was supported by Modem.inf.

RAS for Windows NT 4.0 supports Unimodem modems. If your communications device is not supported by Unimodem, it may be supported by Modem.inf (%systemroot%\System32\RAS\). To configure RAS to use Modem.inf, edit:


Add Value name EnableUnimodem as type REG_DWORD and set it to 0.

In Control Panel / Networks / Services / Remote Access Service, click Properties. Remove all ports that are defined in the RAS Setup dialog. Now, click Add and add them back.

RAS will now use Modem.inf.

Hide comments


  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.