| Exam 210-060 | Question id=1032 | Provision End Users and Associated Devices |
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 |