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ＳＳＮｏ．７的电话用户部分与消息跟踪齐齐哈尔市邮电局崔振刚随着传输设备的数字化和交换系统的智能化，随路信令信号方式正逐步被公共信道信令方式替代，并在当今电信网中广泛使用。ＮＯ．７信令系统的第四功能级即用户部分（ＵＰ），包括电话用户部分（ＴＵＰ）、数据...
SSNo. 7 Telephone subscriber parts and message tracking Cui Zhengang, Post Office of Qiqihar City With the intelligent digitalization and switching system of transmission equipment, the way of signaling signals with the way is gradually replaced by common channel signaling and widely used in the telecommunication network today. NO. The fourth functional level of the signaling system is the user part (UP), including the telephone user part (TUP), data ...