Multi-Tech Systems ISIHP-2S - Manual (Page 38)

Software/Driver Installation
38 MultiModemISI Hybrid Series, ISIHP-2S/2U
3. The Install New Modem dialog box appears. Insert the driver
diskette labeled MultiModem ISI Driver for Windows NT. Then
click Have Disk.
4. The Install from Disk dialog box appears. Click OK.
5. The Install New Modem dialog box appears. From the Models
list, select Central Site Modems for the modems. Then click Next.