As far as I understood, CUCM uses closest-match logic for call routing.
When a number is dialed, Unified CM uses closest-match logic to select which pattern to match from among all the patterns in its numeric call routing table. In practice, when multiple potentially matching numeric patterns are present, the destination pattern is chosen based on the following criteria:
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It matches the dialed string, and
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What if the fewest strings are also the same?
For example, two translation patterns in the same partition: 99[5-6] and 99[6-7]
Dialed number is 996, how the CUCM decides?
