A company has a 5-digit dial plan. A junior engineer inquires about the directory number external masks. Why are external masks used?
A. to block calling number identification
B. to enable called number identification
C. to convert the calling directory number to the PSTN routable calling directory number
D. to associate a directory number with a SIP endpoint
A company has a 5-digit dial plan. A junior engineer inquires about the directory number external masks. Why are externa
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A company has a 5-digit dial plan. A junior engineer inquires about the directory number external masks. Why are externa
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