At the moment DN Pools will recognize normal Route Pattern numbers as in use, but it will not recognize numbers as in use when the Route Pattern is configured with a regex to specify ranges
Zendesk ticket #65227
Screenshot of Route Pattern range in CUCM
Screenshot of DN Pool in APM showing it does not recognize this
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Zendesk ticket #65227
Screenshot of Route Pattern range in CUCM
Screenshot of DN Pool in APM showing it does not recognize this