H11-811 · Question #162
Four intra-office call prefixes 1,12,123, and 1234 are configured on a U1900 series unified gateway. When a user dials the intra-office number 12345, the matched intra-office call prefix is
The correct answer is D. 1234. Option D (1234) is correct because the U1900 gateway uses longest prefix matching: when a dialed number matches multiple configured prefixes, the system selects the most specific (longest) one. The number 12345 begins with all four prefixes (1, 12, 123, and 1234), but 1234 is…
Question
Four intra-office call prefixes 1,12,123, and 1234 are configured on a U1900 series unified gateway. When a user dials the intra-office number 12345, the matched intra-office call prefix is
Options
- A1
- B12
- C123
- D1234
How the community answered
(55 responses)- A2% (1)
- B7% (4)
- C13% (7)
- D78% (43)
Explanation
Option D (1234) is correct because the U1900 gateway uses longest prefix matching: when a dialed number matches multiple configured prefixes, the system selects the most specific (longest) one. The number 12345 begins with all four prefixes (1, 12, 123, and 1234), but 1234 is the longest match, so it wins.
Options A, B, and C are wrong not because they fail to match - they do match - but because they are shorter, less-specific prefixes that lose out to the longer 1234 match. The system doesn't stop at the first match; it finds the best (longest) one.
Memory tip: Think of it like postal codes - "12345" is more precisely routed by the code "1234" than by just "1". The more digits that match, the more specific the route, and specificity always wins in prefix matching.
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