ITU-T D.116-2004
关于本国直拔电话业务的计费和结算原则-系列D:一般收费原则 一般收费原则-国际电信服务中的收费与核算
Charging and Accounting Principles Relating to the Home Country Direct Telephone Service - Series D: General Tariff Principles General Tariff Principles - Charging and Accounting in the International Telephone Service Study Group 3