Private Integrated Services Network (PISN) - Specification, functional models and information flows - Common information Additional Network Feature (ANF) (ISO/IEC 15771 (1998), modified) (Endorsement of the English version EN 301819 V 1.1.1 (2000-10) as German standard)
专用综合业务网(PISN).规范 功能模型和信息流.公共信息附加网络特性(ANF)(ISO/IEC 15771(1998) 修改)(作为德国标准认可英文版EN 301819 V 1.1.1(2000-10)