Multiple route patterns match a number. How does Cisco Unified Communications Managers determine which pattern to use?

The correct answer is D. the one with the closest match. Cisco Unified Communications Manager uses a 'closest match' algorithm (also called Best Match) to resolve conflicts when multiple route patterns match a dialed number. This is distinctly different from IP routing's 'longest prefix match.' In CUCM, 'closest match' means the…

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Question

Options

Athe one that discards everything PreDot
Bthe one with the longest match
Cthe one that comes first in numerical order
Dthe one with the closest match

How the community answered

(23 responses)

A
9% (2)
B
4% (1)
D
87% (20)

Explanation

Cisco Unified Communications Manager uses a 'closest match' algorithm (also called Best Match) to resolve conflicts when multiple route patterns match a dialed number. This is distinctly different from IP routing's 'longest prefix match.' In CUCM, 'closest match' means the pattern with the fewest wildcards or the most specific literal digits wins. For example, 9.1XXXXXXXXXX is a closer match to 914085551212 than 9.@ because it has fewer wildcard characters and is more specific to the dialed string. The pattern that 'discards PreDot' is a digit manipulation feature, not a selection criterion. Numerical order and longest match are not the selection mechanisms CUCM uses.

Topics

#CUCM Call Routing#Route Pattern Matching#Digit Analysis#Longest Match Algorithm

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