LevelOne VOI-7011 - Manual (Page 35)

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When Drop prefix is ON and the dialling prefix is matched, the
prefix will be dropped and replaced by the rule digits and
followed by the rest of dialling digits. When Drop prefix is OFF
and the dialling prefix is matched, the rule digits will be added
before the dialling digits in accord with the settings.
Dialling Prefix Example
Note
Symbol x equals 0,1,2,3,4,5,6,7,8,9
Symbol + equals or