ETSI PRETS 300 356-10-1993 综合业务数字网(ISDN).CCITT 7号信令系统.用于国际接口的ISDN用户部分(ISUP)(版本2).第10部分:子寻址(SUB)补充业务
Integrated Services Digital Network (ISDN); CCITT Signalling System No. 7 ISDN User Part (ISUP) Version 2 for the International Interface Part 10: Subaddressing (SUB) Supplementary Service