方案中还提出了以SIP地址域的分级方式进行组织管理的用户数据库系统，定义了为子网中移动终端服务的区域代理。
The scheme also defines a user database system organized by hierarchical domains of SIP address, and a domain agent managing mobile nodes in subnetwork.
方案中还提出了以SIP地址域的分级方式进行组织管理的用户数据库系统，定义了为子网中移动终端服务的区域代理。
The scheme also defines a user database system organized by hierarchical domains of SIP address, and a domain agent managing mobile nodes in subnetwork.
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