后者更为安全，我们以后会解释；然而，如果用户要求在他们的WAP设备上进行多用途的网络访问，一个内部的wap网关会很不方便。
The latter scenario is the more secure choice, as we'll see later; however, if users want general-purpose network access on their WAP devices, an internal WAP gateway can be an inconvenience.
它们需要一种网关设备，该网关设备可以将安全令牌从客户端希望使用的格式转换为在自已网络中使用的ltpa令牌。
They want a gateway device that can translate security tokens from whatever format the client wants to use into an LTPA token for consumption within their own networks.
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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