隆重推出NO.7信令系统(SS7)之国家标准（中文）—— NO7-2M高速信令链路(MTP部分)yd1125-grand launch Signaling System No.7 (SS7) of the national standard (Chinese) -- nr 7-2M high-speed signaling link (MTP) yd1125

隆重推出NO.7信令系统(SS7)之国家标准（中文）—— NO7-综合业务数字网用户部分ISUP ydn038-grand launch Signaling System No.7 (SS7) of the national standard (Chinese) -- nr 7-Integrated Services Digital Network User Part ISUP ydn038

隆重推出NO.7信令系统(SS7)之国家标准（中文）—— NO7-综合业务数字网用户部分ISUP(补充) ydn038.1-grand launch Signaling System No.7 (SS7) of the national standard (Chinese) -- nr 7-integrated business Digital Network User Part ISUP (supplementary) ydn038.1

隆重推出NO.7信令系统(SS7)之国家标准（中文）—— NO7-信令连接控制部分(SCCP)-grand launch Signaling System No.7 (SS7) of the national standard (Chinese) -- nr 7-signaling connection control part (SCCP)