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结合天津本地电话网的实际，阐述了在Ｎｏ．７信令网的通信与维护工作中需要注意的问题，对Ｎｏ．７信令的ｌｅｖｅｌ３的功能作了介绍，指出了建设和维护好Ｎｏ．７信令网，对于提高电信网的运行质量和效率有十分重要的意义。
Combined with the actual local telephone network in Tianjin, described in No. 7 signaling network communication and maintenance work need to pay attention to the issue of No. 7 signaling level3 features were introduced, pointed out that the construction and maintenance of good No. 7 signaling network, to improve the operation of the telecommunications network quality and efficiency are of great significance.