When dialing 1234, which rule is matched first?

The correct answer is C. translation pattern 12[123]X. CUCM applies two key tie-breaking rules for dial plan lookups: (1) Pattern specificity - a more specific pattern beats a less specific one, and '12[123]X' is more specific than '1XXX' because it restricts the 3rd digit to [123] rather than accepting any digit (X). (2) Pattern typ

Gateway and Dial Plan

Question

Options

Aroute pattern 1XXX
Broute pattern 12[123]X
Ctranslation pattern 12[123]X
Dtranslation pattern 1XXX
Edirectory number 12345

How the community answered

(31 responses)

B
3% (1)
C
77% (24)
D
13% (4)
E
6% (2)

Explanation

CUCM applies two key tie-breaking rules for dial plan lookups: (1) Pattern specificity - a more specific pattern beats a less specific one, and '12[123]X' is more specific than '1XXX' because it restricts the 3rd digit to [123] rather than accepting any digit (X). (2) Pattern type priority - when two patterns are equally specific, a translation pattern is processed before a route pattern. Here, '12[123]X' matches 1234 (1=1, 2=2, 3∈[123], 4=X) and is more specific than '1XXX', so translation pattern '12[123]X' wins. Directory number 12345 does not match because it is five digits, not four.

Topics

#pattern matching precedence#translation pattern#route pattern#dial plan

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