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。
If this is the case the circuit manager may wish to filter out datagrams for the appropriate network layer if only one of the applications is affected.
在这种情况时，链路管理器可能为特定的网络层过滤数据包，而只使一个程序受影响。
If this is the case the circuit manager may wish to filter out datagrams for the appropriate network layer if only one of the applications is affected.
在这种情况时，链路管理器可能为特定的网络层过滤数据包，而只使一个程序受影响。
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