应用服务器不仅负责承载和执行服务，而且还要使用SIP协议提供针对控制层的接口。
The application servers are not only responsible for hosting and executing the services, but also provide the interface against the control layers using the SIP protocol.
JCA资源适配器由应用服务器承载，这些应用服务器通过JCA规范作为系统协议定义的一组Service Provider Interfaces (SPI)来控制资源适配器的生命周期。
JCA resource adapters are hosted by application servers that control their life cycle through a set of Service Provider Interfaces (SPI) defined by JCA specifications as System Contracts.
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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