在RFC 3262中，开发了一项机制来确保可靠地发送消息，且仅为确认目的而发送，以便在使用udp之类的传输协议时不会丢失呼叫状态。
In RFC 3262, a mechanism was developed to ensure that the responses are sent reliably and acknowledged alone so that the status of the call is not lost if the transport protocol is something like UDP.
为广域网mpls路径建立及运作呼叫允许控制(CAC)机制，以避免语音质量下降。
Set up and operate CAC (Call Admission Control) mechanisms for the WAN MPLS paths to avoid voice quality degradation.
在通信功能模块的实现中，将快速连接方式和隧道机制的思想应用于呼叫模块中，减少了通信时间。
In designing the communication module, we creatively applied the fast - start method and the tunneling mechanism to the calling process, so as to reduce the calling time and improve the efficiency.
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