Multi-Tech Systems ISIHP-2S - Manual (Page 15)

Software/Driver Installation (Windows NT)
MultiModemISI Hybrid Series, ISIHP-2S/2U 15
8. Then this ISI Cards dialog box appears. Select the starting port
(usually port 3).
9. The ISI Cards dialog box appears again showing the port
assignment. Click Add to add additional cards and repeat step 8.