Each database is also given an address called a subsystem number, for use in routing queries from Service Switching Points (SSPs) through the SS7 network to the actual database entity.

• 还会赋给每个数据库一个称为系统号的地址，对来自业务交换点 (SSP) 的请求进行路由，使其通过 SS7 网络到达实际数据库实体。