These virtual terminals are very useful for a centralized operations staff that is managing different partitions for different groups in a service provider environment.
对那些为服务提供者环境中不同组管理不同分区的进行集中操作的职员来说，这些虚拟终端非常有帮助。
Service charging is a key problem to face in order to provide multi-logical virtual Numbers to mobile terminals. Current charging methods are difficult to solve to adapt current network condition.
为移动终端提供逻辑虚号码的实现中，计费是关键问题，基于现有计费方法解决该问题存在许多不足。
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