I have recieved approx 20 tickets today for internal users attempting to make outbound calls. We have 2 full PRIs for outbound voice and don't appear to have a capacity issue. Looking at the CDR for each failed call, they contain a destCause_value of 1, which according to documentation means "Unallocated/unassigned number". If the user waits a few mins and tries again, the call goes through just fine.
Is this unallocated/unassigned cause code indicating that my telco provider is rejecting the call as a bad number and that I should open a ticket with the voice provider?