Multi-Tech Systems MULTIVOIP MVP-410ST/810ST - Manual (Page 130)

Technical Configuration (T1/E1) MultiVOIP User Guide
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3. Confirm Connection. If the MultiVOIP is set for an available COM
port and is correctly cabled to the PC, the MultiVOIP main screen will
appear. (If the main screen appears grayed out and seems inaccessible,
go to step 4.)