Multi-Tech Systems MULTIVOIP MVP-410ST/810ST - Manual (Page 290)

Technical Configuration (Analog/BRI) MultiVOIP User Guide
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15. Set Supplementary Services Parameters. This dialog box can be
reached by pulldown menu, keyboard shortcut, or sidebar.
Accessing “Supplementary Services” Parameters
Pulldown Icon
Shortcut Sidebar
Ctrl + Alt +H
Supplementary Services features derive from the H.450 standard,
which brings to voip telephony functionality once only available with
PSTN or PBX telephony. Supplementary Services features can be used
under H.323 only and not under SIP.