Circuitswitched transmission entails a dedicated circuit for communication between two dedicated devices.
线路交换传送需要在两个专用设备之间使用专用线路进行通信。
2
There are two types of transmission: circuitswitched and packet switched.
有两种传送方式：线路交换和包交换。
3
In addition, the transport layer allows IMS devices to make and receive calls to and from the PSTN network or other circuit-switched networks via the PSTN gateway.