Multi-Tech Systems MULTIVOIP MVP-2410 - Manual (Page 163)

MultiVOIP User Guide Technical Configuration (Digital Voips)
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The Regional Parameters screen will appear. For the country selected, the
standard set of frequency pairs will be listed for dial tone, busy tone,
‘unobtainable’ tone (fast busy or trunk busy), and ring tone.
In each field, enter the values that fit your particular system.