packet-switching services 分组交换服务

Routing and Switching Services 路由和交换服务

gateway mobile-services switching center 网关移动业务交换中心

Mobile-services Switching Center 移动业务交换中心

Tandem Mobile-services Switching Centre 汇接移动业务交换中心

mobile services switching center 移动服务交换中心

Mobile services Switching Centre 移动业务交换中心

services switching point 业务交换点

home mobile services switching centre 原籍移动无线局

Mobile-services Switching Centre 移动业务交换中心