Route Pattern Selection for IP Phone Calls
Question
When route patterns 200X and 200[0-9] exist in the same partition, how does a Cisco Unified Communications Manager select a matching pattern when an IP phone places a call to 2005?
Answers
Explanations
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A. B. C. D. E.B.
When there are two or more route patterns that match a dialed number, Cisco Unified Communications Manager (UCM) must select the best match to use for call routing. The algorithm that determines which route pattern to use is known as digit analysis.
In this scenario, there are two route patterns in the same partition, 200X and 200[0-9], and an IP phone is placing a call to 2005. Both of these patterns match the dialed number, so the question is which one will be selected.
The answer is E. 200[0-9] is selected because it is the most specific match. The square brackets and range of numbers in this pattern make it more specific than the 200X pattern. When a digit string matches multiple route patterns, Cisco UCM selects the most specific match, which is the one that has the most digits or the most specific pattern.
Option B is incorrect because the number of characters in a pattern is not a factor in the digit analysis algorithm. Option C is also incorrect because the logic used to select the best match is configurable. Options A and D are incorrect because Cisco UCM does not alternate or randomly select route patterns.
Therefore, the most appropriate answer is E.
