Multi-Tech Systems MT128ZLX-NT - Manual (Page 132)

MultiMobile MT128ZLX User Guide 4: Windows NT API Usage
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12. The Modem or Adapter screen appears. For this example, select “RVS ISDN V.120 (COM3).”
Click Next>.
13. The Phone Number screen appears. Enter the phone number of the dial-up server you are calling.
Click Next>.