Multi-Tech Systems MT128ZLX-NT - Manual (Page 43)

MultiMobile MT128ZLX User Guide 2: Windows 95 API Usage
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4. The next screens allows you to select which COM port to use with the MT128ZLX.
Select “ISDN 2nd COM.” Click Next>.
5. At the completion screen, click Finish. You should now see two ISDN devices in the Modems
Properties
window.
Click Close to exit from the Modems Properties window. Then close the Control Panel window.