ETSI EN 300 356-1-1998 综合业务数字网(ISDN).7号信令系统.国际接口的ISDN用户部分(ISUP)版本3.第1部分:基本业务(版本3.2.2).ITU-T建议Q.761-Q.764 1997,修正本
Integrated Services Digital Network (ISDN); Signalling System No.7; ISDN User Part (ISUP) Version 3 for the International Interface; Part 1: Basic Services V3.2.2; ITU-T RECMN Q.761 to Q.764 1997, Modified