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.

此外，传输层允许IMS设备通过PSTN网关呼叫PSTN网络或其他电路交换网络和接收来自这些网络的呼叫。

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In a circuit-switched network when you use a circuit, you have the full circuit for the time that you are using the circuit without competition from other users.

在电路交换网络中使用电路时，您在使用该电路的时间内将拥有整个电路，不会与其他用户争用。

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Dynamic routing technology of circuit-switched network is critical to bring non-hierarchical network into full services and improve the grade of service eventually.

无级电话网动态路由技术是充分利用现有设备、提高服务质量的关键技术。

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However, VOIP differs from the usual phone services in that it sends calls as digital packets of information over data networks rather than relying on a dedicated circuit-switched network.

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They then analyze how the remaining major cost components, switching and transmission for both types of networks and interconnecting with the switched circuit network for the IP-based networks, change with the change in technology.

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