报文处理主要是与外界直连的邻居交换机进行通信，并将信息与本地进行比较。
Packet processing is mainly straight with the outside world to communicate with the neighbor switch, and compare the information with the local.
承载通路连接协议在本地交换机的控制下根据需要来建立和清除承载连接，该连接由信令信息来标识。
A bearer channel connection protocol establishes and de-establishes bearer connections required on demand, identified by the signalling information, under the control of the Local Exchange.
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