Multi-Tech Systems ISIHP-2U - Manual (Page 27)

Software/Driver Installation (Windows NT)
MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD 27
8. After the terminal adapters install, click Finish to return to the
General tab to view COM port assignments (and make changes if
necessary). Now you are ready to install the modems.
To install modems: {does not apply to -4SD}
1. In the General tab, click Add.