CAMEL Phase 1 defined only very basic call control services, but introduced the concept of a CAMEL Basic call state model (BCSM) to the Intelligent Network (IN).
CAMEL阶段1（Phase 1）仅仅定义了非常基础的呼叫控制服务，但是向智能网（IN）中引入了CAMEL基本呼叫状态模型（Basic call state model，简称BCSM）的概念。