The No. 7signallingsystem is mostly used between networks and inner network in all sorts of modern telecommunication network. It plays an important role in the quality and level of service.
The Message Transfer Part (MTP) of SignallingSystem No. 7 (SS No. 7) is designed as a joint transport system for the messages of different users.
七号信令系统的消息传递部分设计得像一个、联合传送系统，可传送不同用户的信息。
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In order to solve this, problem a common channel signalling No. 7system appears. The paper introduces how to modify DPC in HARRIS Switcher′s database in detail.