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文章在分析IN与Internet互通概念模型和功能模型的基础上对互通接口问题进行了深入研究；对支持PINT业务的网关实体的功能、配置位置和模型进行了分析，并对INAP的操作进行了扩展。
Based on the analysis of the conceptual model and functional model of interworking between IN and Internet, this paper deeply studies the interworking interface problem, analyzes the function, configuration location and model of gateway entity supporting PINT service, and expands the operation of INAP .