Anything in CUCM is configured. If some ranges are not configured, then you cant see them. The best way to know this is to contact your Telco..
If you are 100% certain the all your DDI ranges are configured in CUCM, then you can deduce them this way
by looking at your xaltion patterns.
If you are using xlation patterns to route calls inbound from the PSTN to the phones, then you can deduce the DDI from there..
But your best bet is to contach your Telco
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