ETSI PRETS 300 657-1997 宽带综合业务数字网(B-ISDN).7号信令系统.B-ISDN用户部分(B-ISUP)功能集1(CS1).补充服务ITU-T建议Q.2730 (1995),修正本
Broadband Integrated Services Digital Network (B-ISDN); Signalling System No.7; B-ISDN User Part (B-ISUP) Capability Set 1 (CS1); Supplementary Services ITU-T Recommendation Q.2730 (1995), Modified