Multi-Tech Systems MT128ZLX-NT - Manual (Page 121)

MultiMobile MT128ZLX User Guide 4: Windows NT API Usage
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5. The Modem or Adapter screen appears. For this example, select “MT128STZLX (ISDN1).”
Click Next>.
6. The Phone Number screen appears. Enter the phone number of the dial-up server you are calling.
Click Next>.