MultiVOIP User Guide Technical Configuration (Digital)
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13. Set Custom Tones and Cadences (optional) . The Regional
Parameters dialog box has a secondary dialog box that allows you to
customize DTMF tone pairs to create unique ring-tones, dial-tones,
busy-tones or “unobtainable” tones (fast busy signal) for your system.
This screen allows the user to specify tone-pair attributes that are not
found in any of the standard national/regional telephony toning
schemes. To access this customization feature, click on the Custom
button on the Regional Parameters screen.