Multi-Tech Systems MULTIVOIP MVP-410ST/810ST - Manual (Page 241)

MultiVOIP User Guide Technical Configuration (Analog/BRI)
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In each field, enter the values that fit your particular network.
The kinds of parameters for which values must be chosen depend on
the type of telephony supervisory signaling or interface used (FXO,
E&M, etc.). We present here the various parameters grouped and
organized by interface type.