The proliferation of SPC exchanges in telecommunication operator(telco) networks forced the centralization of supplementary services in special network nodes in order to facilitate the update and introduction of such these services.

• 无线电通讯操作网络中存储控制程序交互系统的增多，促进了各独立网点的附加服务的集中化，以便于这些服务的更新和介绍。