Multi-Tech Systems ISIHP-2U - Manual (Page 30)

Software/Driver Installation (Windows NT)
30 MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD
6. To view COM port assignments and make necessary changes, use
the Modem Properties dialog box.
7. Close the Modems Properties dialog box. The message below
appears asking if you want to configure dial-up networking. Click
Yes.