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在ITU－T的智能网IN与Internet互联模型中使用了三个网关：CBGW、SCGW和MGW。呼叫承载网关CBGW主要实现承载和信令级别上的互联。本文中对CBGW功能模块做了较详细的讨论和设计。并讨论了用到的模型和协议。
Three gateways are used in the ITU-T Intelligent Network IN and Internet Connectivity model: CBGW, SCGW and MGW. CBGW call bearer gateway mainly bearer and signaling level on the Internet. In this paper, CBGW functional modules made a more detailed discussion and design. And discusses the models and protocols used.