The Centrex billing management system of Dandong telecommunication is a typical telecommunication service application system.
丹东电信虚拟网计费管理系统是一个典型的电信业务应用系统。
The Centrex billing management system of Dandong telecommunication is a typical telecommunication service application system.
丹东电信虚拟网计费管理系统是一个典型的电信业务应用系统。
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