Private Integrated Services Network (PISN) - Mapping functions for the employment of a circuit mode basic service and the supplementary service user-to-user signalling as a pair of on-demand inter-PINX connections (Mapping/UUS) (Endorsement of the English version EN 301102 V 1.1.1 (1998-06) as German standard)
专用综合业务网(PISN).作为一对按需PINX间连接(映射/UU)使用电路模式基本业务和补充业务用户对用户信令的映射功能