grand launch Signaling System No.7 (SS7) of the national standard (Chinese)-- nr 7-integrated business Digital Network User Part ISUP (supplementary) ydn038.1

Packet : 97288393no7-isup-ydn038.1.rar filelist
NO7-综合业务数字网用户部分ISUP(补充) ydn038.1.pdf

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