If all patterns below are configured in Cisco Unified Communications Manager which would be used when dialing the pattern "123"?

The correct answer is D. 1[2-5]. CUCM uses a 'best match' algorithm for dial plan pattern selection, where more specific patterns take precedence over less specific ones. Pattern specificity is ranked: explicit digits > character classes (e.g., [2-5]) > the X wildcard. Pattern '121' does not match '123' at all.

Cisco Unified Communications Manager Dial Plan

Question

If all patterns below are configured in Cisco Unified Communications Manager which would be used when dialing the pattern "123"?

Options

A121
B12X (urgent priority set)
C1XX (urgent Priority Set)
D1[2-5]

How the community answered

(48 responses)

A
13% (6)
B
21% (10)
C
6% (3)
D
60% (29)

Explanation

CUCM uses a 'best match' algorithm for dial plan pattern selection, where more specific patterns take precedence over less specific ones. Pattern specificity is ranked: explicit digits > character classes (e.g., [2-5]) > the X wildcard. Pattern '121' does not match '123' at all. Patterns '12X' and '1XX' use the X wildcard (matches any single digit), but '1[2-5]' uses a character class which is more specific than X. A character class [2-5] narrows the match to only digits 2 through 5, making it more specific than the X wildcard that matches any digit (0-9). Therefore, '1[2-5]' wins the best-match competition. The 'Urgent Priority' flag on the other patterns only affects interdigit timeout behavior, not the best-match selection.

Topics

#CUCM Dial Plan#Pattern Matching#Urgent Priority#Wildcard and Range Patterns

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