SS7 is characterized by: signaling speed, has the potential to provide a large number of signaling, signaling a change and increase the flexibility, ease of opening up new business, can dispose of the call signaling, and low cost. Now widely used. Since CCITT SS7 1980, Yellow Book, has repeatedly amended to make the White Paper in 1993. China SS7 specification implemented in August 1990, the specification is based on CCITT Blue Book issued in 1988 as the reference set, only the use of the telephone network, that is only used message transfer part (MTP) and the Telephone User Part (TUP)

no7.doc

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