Records needed for this question
DID inventories, number ranges and block pricing schedules.
How to investigate
Expand the contracted ranges and identify overlaps or charges outside their effective dates.
An illustrative review decision
An allocated telephone-number block may contain unused numbers reserved for expansion. Confirm the block's charging basis and the owner's requirement before treating every unassigned number as a removable cost.
What can lead to the wrong conclusion?
An unused individual number may still belong to a correctly billed fixed-price block.
The result to retain
A range-level discrepancy schedule.
Apply the review in context
Review carrier invoice evidence, inventory, findings and recovery cases in AuditRes Telecom.
This guide describes a human review method, not a claim that every scenario is automatically detected or executed. Explore AuditRes Telecom.