| 摘要 |
PURPOSE:To enable the direct telephone between A and B stations without using any exclusive circuit by using the junction line trunk for PBX and the like. CONSTITUTION:With the key operation at A and B stations, junction line trunk TLF is switched toward telephone A0 and B0 respectively. And a direct connection is secured between A0 and B0 to enable the free call and speaking from either side. In case TLF is put under the normal state, ordinary extension telephone A1 and B1 are connected by the normal exchange action. |
