Tel•e•com•mu•ni•ca•tion (tĕl'ĭ-kə-myū'nĭ-kā'shən) n.
Telecommunication is the science and technology of communication at a distance by electronic transmission of impulses, as by telegraph, cable, telephone, radio, or television.

Au•dit (ô'dĭt) n.
An examination of records or financial accounts to check their accuracy.An adjustment or correction of accounts.An examined and verified account.

Telecommunication Audit 
In telecommunication, the term audit has the following meanings:

An auditor conducts an independent review and examination of telecom records, bills, and activities to assess the adequacy of system controls. Some of an auditor’s goals are to ensure compliance with established policies and operational procedures, and to recommend necessary changes in controls, policies, or procedures.

Analysis of invoices, lines, rates, tariffs, taxes, plans, usage, call volume, systems, and contracts resulting in cost reduction, proper invoicing and optimization of telecommunication systems often conducted by a Telecommunication Auditor.