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本文对CCITT1988年发表的蓝皮书中有关No.7信令部分的内容作了概括的介绍,对其中与黄皮书及红皮书中有关内容的不同之处重点做了说明。
This article gives a general introduction to the contents of No. 7 signaling part of the ITU-T Recall presented by CCITT in 1988, and focuses on the differences between the Yellow Paper and the Red Book.