300-070 Question #21: Real Exam Question with Answer & Explanation

The correct answer is B: PreAt. In CUCM route patterns, the @ symbol is a wildcard that represents the entire North American Numbering Plan (NANP) - it matches all valid NANP numbers. The PreAt discard instruction removes all digits dialed before the @ symbol, leaving only the NANP-compliant portion of the numb

Question

Which discard digits instruction removes all digits prior to the North American Numbering Plan portion of the route pattern?

Options

APreDot
BPreAt
CPre
DPreNANP

Explanation

In CUCM route patterns, the @ symbol is a wildcard that represents the entire North American Numbering Plan (NANP) - it matches all valid NANP numbers. The PreAt discard instruction removes all digits dialed before the @ symbol, leaving only the NANP-compliant portion of the number to be forwarded. This is useful when the route pattern includes a prefix or access code followed by @, and you only want to pass the core NANP digits to the next system. PreDot removes digits before a dot separator, not before the NANP wildcard.

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