The traditional telephony system or IP network is depicted as a silo structure, which is comprised of proprietary black box solutions closely coupled with network Equipment Providers (NEP) hardware.
传统的电话系统或ip网络描述为竖井(silo)结构，由与网络设备提供商(Net work Equipment Providers, NEP)硬件紧密偶合的专用黑盒解决方案组成。