Our analysis of line carrier invoices shows that there are material errors on almost 30% of all invoices. Carrier invoice reconciliation will detect these errors and assure that you are not being over-billed by your carrier. We reconcile the active trunks reported by the PBXs and key systems to the trunks billed by the vendor.  We frequently find trunks billed that are not active.  We compare the toll usage reported by your network to the actual usage billed.  And we track service authorized to service billed for moves, adds and changes.