这是我曾经做过的会议汇接系统的源码，包括对环路、数字中继（一号信令）、语音混合操作，开发环境为万利仿真开发机。有兴趣此方面的朋友可以参考一下！-This is what I have done Conference Tandem system source code, including the right loop, digital relay (on the 1st Signaling), voice mixed operation, development environment for