ITU-T E.164.3-2001
E.164国家编码和国家组联合识别码分配和收回的原理 基准和程序 E系列:整体网络操作 电话服务
Principles Criteria and Procedures for the Assignment and Reclamation of E.164 Country Codes and Associated Identification Codes for Groups of Countries Series E: Overall Network Operation Telephone Service Service Operation and Human Factors Internationa