自从开通音频各站养路分机以来,区段用户任意选叫两端电话所的问题尚未解决。为改善区段回线呼叫堵塞情况,提高回线利用率,避免电话所不必要的转接,我段于佳双各站回线采用符号呼叫法使该问题得到解决,效果良好。一、考虑原则解决该问题有两种办法,一种是各站分机加选叫电话所振荡器,利用振荡器送出不同频 Since the introduction of audio stations at each station maintenance extension, the user of any section called the election of both ends of the phone has not been resolved. In order to improve the situation of block call of loopback, improve the loop utilization rate and avoid the unnecessary transfer of telephone, I use the symbolic call method in Yujia Shuang station back line to solve the problem and work well. First, consider the principle of the problem There are two ways to solve this problem, one is the extension of the station called the phone called the oscillator, the oscillator to send different frequencies