当前,在同一条外线上并接多部同线电话是很普遍的。但直接并接多部电话存在相互干扰和窃听等问题,故各种同线电话控制器应运而生。应用最多的是同线电话保密器或转接器,虽基本解决了窃听问题,但仍存在相互干扰,即外线打入同时振铃,先摘机者若不是外线要找的,又需外线重拨一次,或转呼喊人,很不方便。目前市场上推出带电脑的同线电话控制器,一条外线可带四部电话,其功能较多,外线可直拨分机,但一般只限于双音频拨号,由于脉 Currently, it is common to connect multiple simultaneous calls to the same outside line. But directly and then a number of phone interoperability and eavesdropping and other issues, so all kinds of same-line telephone controller came into being. The most widely used is the same telephone line confidentiality or adapter, although the basic solution to the problem of wiretapping, but there is still mutual interference, that is, at the same time outside the ring into the ring, the first off the hook if it is not looking for outside, but also outside weight Dial once, or call shouting, very inconvenient. Currently on the market with the introduction of the computer with the telephone controller, an outside line with four phones, its more features, external direct dial extension, but generally limited to dual-tone dialing, due to the pulse