This paper put forward an idea that use a voice data multiplexing equipment pulls through the EI transmission channels over the leased lines for splitting and re-used slot to provide Ethernet interface, anti-polar accounting functions, calling number display functions and RS232 data channel. 提出了在租用线路上利用语音数据复接设备通过一个E1传输通道,进行时隙的分拆和复用,提供以太网口、有反极性计费功能和来电显示功能的电话和一个RS232的数据通道。