The telecommunication costs the bookkeeping system is the telecommunication enterprise important operation strut system one, it is undertaking after the user use telecommunication enterprise service the expense calculation with the function which gathers. 电信计费帐务系统(TBAS)是电信企业重要的运营支撑系统(BSS)之一,它承担着在用户使用电信企业服务后费用的核算与收取的功能。