Owner`s manual

Software/Driver Installation (Windows NT)
18 MultiModemISI Hybrid Series, ISIHI-2S/2U
3. The Install New Modem dialog box appears. From the Models list,
select Central Site Modems for the modems. Then click Next.
4. Select the ports that correspond to the last four ports of the ISIHI-2S/
2U card. Click Next. The modems install to the selected COM ports.
5. After the modems install to the ports, click Finish to return to the
General tab to view COM port assignments (and make changes if
necessary).