Multitech MULTIVOIP MVP-2410 User Manual page 218

Technical Configuration (Analog/BRI)
4. Solving Common Connection Problems.
A. Fixing a COM Port Problem. If the MultiVOIP main screen appears
but is grayed out and seems inaccessible, the COM port that was
specified for its communication with the PC is unavailable and must
be changed. An error message will appear.
To change the COM port setting, use the COM Port Setup dialog box,
which is accessible via the keyboard shortcut Ctrl + G or by going to
the Connection pull-down menu and choosing "Settings." In the
"Select Port" field, select a COM port that is available on the PC. (If
no COM ports are currently available, re-allocate COM port resources
in the computer's MS Windows operating system to make one
available.)
Ctrl + G
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MultiVOIP User Guide