remote locations when those calls are rejected by the IP WAN because of insufficient bandwidth. Macon facility has a DID range from 912-556-0500 to 912-556-0550.How should the external phone masks…

The correct answer is D. 77055XXXXX. The external phone number mask defines how a phone's caller ID (PSTN-facing number) is presented when calls are rerouted over the PSTN as a fallback. The mask uses X to represent variable digits that are taken from the actual extension. The format 77055XXXXX uses five X…

Gateway and Dial Plan

Question

remote locations when those calls are rejected by the IP WAN because of insufficient bandwidth. Macon facility has a DID range from 912-556-0500 to 912-556-0550.How should the external phone masks be configured?

Options

A770557XXXX
B9125560XXX
C770555XXXX
D77055XXXXX

How the community answered

(28 responses)

A
4% (1)
B
11% (3)
C
4% (1)
D
82% (23)

Explanation

The external phone number mask defines how a phone's caller ID (PSTN-facing number) is presented when calls are rerouted over the PSTN as a fallback. The mask uses X to represent variable digits that are taken from the actual extension. The format 77055XXXXX uses five X placeholders, which allows the mask to accommodate a wider range of extensions under the 770-55 prefix. This flexibility is needed when a site has a DID range spanning multiple hundreds of numbers across sub-blocks. The other options either use the wrong area code/prefix or do not provide enough variable digit positions to cover the required DID range.

Topics

#external phone mask#DID#PSTN presentation#calling number

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