ETSI EN 300 356-7-2001 综合业务数字网(ISDN).7号信令系统(SS7).国际接口的ISDN用户部分(ISUP)版本4.第7部分:终端便携性(TP)补充业务(版本4.1.2).ITU-T建议Q.733,第4条(1993)
Integrated Services Digital Network (ISDN); Signalling System No.7 (SS7); ISDN User Part (ISUP) Version 4 for the International Interface; Part 7: Terminal Portability (TP) Supplementary Service (Version 4.1.2; ITU-T Recommendation Q.733, Clause 4 (1993)