An engineer must configure a voice translation rule on a Cisco voice gateway to truncate numbers down to the last four digits. Which voice translation regex rule must the engineer use?

The correct answer is A. rule 1 /^.*\(....\)/ /\1/. The correct regex is: rule 1 /^.\(....\)/ /\1/ Breaking it down: '^.' matches any number of leading characters (greedy), '\(....\)' captures exactly four characters in a tagged group (using Cisco IOS regex syntax where parentheses are escaped with backslashes), and '/\1/'…

Voice Gateways and Session Border Controllers

Question

Options

Arule 1 /^.*(....)/ /\1/
Brule 1 /*1(2-9]..../ /\1/
Crule 1 /^.*(..)/ /\4/
Drule 1 /^[2-9](..)/ /.3/

How the community answered

(43 responses)

A
81% (35)
B
2% (1)
C
5% (2)
D
12% (5)

Explanation

The correct regex is: rule 1 /^.*(....)/ /\1/

Breaking it down: '^.*' matches any number of leading characters (greedy), '(....)' captures exactly four characters in a tagged group (using Cisco IOS regex syntax where parentheses are escaped with backslashes), and '/\1/' replaces the entire matched string with only the captured four-character group. This effectively strips all leading digits and retains only the last four. Option B uses character class syntax incorrectly, Option C uses '/\4/' (a nonexistent group), and Option D anchors to a specific digit range and uses an incorrect backreference.

Topics

#Voice Gateway Configuration#Voice Translation Rules#Regular Expressions#Call Digit Manipulation

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