On the basis of introducing ISDN technique in detail,the paper discusses the technology problems and realization scheme of adding ISDN exchange function for HAX-SP1/C.

• 论文在详细阐述ISDN技术的基础上，讨论了为现有的HAX-SP1/C大型数字程控交换机增加ISDN交换功能的技术问题和实现方案。