路由选择号码以自身了解的方式遵循外部网络的信令协议。
The routing number follows the signalling protocol of the external network.
纵横制交换由一个称为标志器的特定电路控制，标志器提供整个号码的公共控制并选择所有呼叫的路由。
Crossbar switching was carried out by a special circuit called a maker which provided common control of number entry and line selection for all calls.
交换机支持基于策略的路由，其中根据域名，电话号码和类似内容选择具体路由路径。
The switch's supports policy based routing where specific routing paths are selected based a domain name, a telephone number, and the like.
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