Multi-Tech Systems MULTIVOIP MVP-410ST/810ST - Manual (Page 116)

Software Installation MultiVOIP User Guide
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7. On the next screen you can select the COM port that the command
PC will use when communicating with the MultiVoip unit. After
software installation, the COM port can be re-set in the MultiVOIP
Software (from the sidebar menu, select Connection | Settings to
access the COM Port Setup screen or use the keyboard shortcut Ctrl
+ G).
NOTE : If the COM port setting made
here conflicts with the actual COM
port resources available in the
command PC, this error message will
appear when the MultiVOIP program
is launched. If this occurs, you must
reset the COM port.