它使得在商业过程中不用考虑可靠传递，并且允许对传输进行适当的优化。
This keeps the concerns of reliable delivery out of the business process and allows for transport appropriate optimizations.
许多表示法和运行时不允许向后传输连接。
Many notations and runtimes do not permit backward flowing connections.
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。
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.
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