DIN EN 301715-2003 数字蜂窝式远程通信系统(2+相位)(GSM).移动(通信手机)号码可携带业务(MNP)的支持.第1阶段业务描述
Digital cellular telecommunications system (Phase 2+) (GSM) - Support of Mobile Number Portability (MNP) - Service description; Stage 1 (GSM 02.66 version 7.0.2 Release 1998) (Endorsement of the English version EN 301715 V 7.0.2 (1999-12) as German standa