数据通信用户协会。
与此相反，移动通信用户的月平均收入ARPU值却逐步下降。
On the contrary, the average revenue per user (ARPU) decreased step by step.
七号信令鉴权系统是针对于通信用户在不同的通信网间的使用权限的鉴别系统。
SS7 is the identification system which aims at the authority identification of communication users corresponding in different communication net.
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