Multi-Tech Systems MT128ZLX-NT - Manual (Page 143)

MultiMobile MT128ZLX User Guide 4: Windows NT API Usage
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At the Multiple Line Configuration screen, click OK.
At the Edit Phonebook Entry screen, click OK.
To use the new multi-link connection, click on the Dial button. Type in the user name and password for
your remote account. If you are joining a domain, you must also specify the domain name.