The basic ESB pattern abstracts application components into a set of services that interact through a bus rather than through direct, point-to-point communications.
基本esb模式将应用程序组件抽象为一个服务集，这些服务通过总线进行交互(而不是通过直接的点到点通信交互)。
With features of nearly real time communications and low cost, instant messaging become so important services in NGN that it is necessary for Softswitch to provide basic ability of instant messaging.
即时消息业务具有通信便捷和价格低廉等优点，是下一代网络中不可或缺的业务之一。
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