Private Integrated Services Network (PISN) - Use of QSIG at the C reference point between a PINX and an interconnecting network (ISO/IEC 20161 (2001), modified) (Endorsement of the English version EN 301914 V1.1.1 (2004-01) as German standard)
专用综合业务网(PISN).在PINX和互连网络之间的C参考点使用QSIG(ISO/IEC 20161(2001) 修改)(认可英文版EN 301914 V1.1.1(2004-01)为德国标准)