简要介绍了智能网ＣＳ－２中引入的网间互联功能的概念及其目的，并介绍了计费模型的概念以及我国智能网目前的计费模型。提出了引入网间互联功能后智能网的计费模型，结合此计费模型讨论了网间被叫集中付费业务的计费方式 This paper briefly introduces the concept and purpose of internetworking function introduced in intelligent network CS-2 and introduces the concept of charging model and the current charging model in China’s intelligent network. Put forward the charging model of intelligent network after the introduction of inter-network interconnection function, and combined with this charging model discussed the billing method of centralized called service of inter-network called