ETSI EN 300 356-22-2003 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22部分:国际紧急参考方案(IEPS)业务(版本1.1.1).ITU-T修改件(2002)Q.761- Q.764
Integrated Services Digital Network (ISDN); Signalling System No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 22: International Emergency Preference Scheme (IEPS) service (V1.1.1; ITU-T Amendments (2002) to Q.761 - Q.764