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广州地铁以往的轨道交通公务电话系统采用传统的电路交换技术,线路利用率低,业务单一,越来越不能适应轨道交通快速发展的新形势。公务电话系统采用软交换设备组网,在新线路控制中心设置主备软交换中心设备(SS),作为新线及线网公务电话系统交换中心,并与轨道交通其他线路公务电话系统以及市内公用电话网互联互通,另外新线设置的软交换中心同时作为全网软交换中心。
The conventional rail transit public telephone system of Guangzhou Metro adopts the traditional circuit switching technology, which has a low utilization rate and a single business and can not adapt to the new situation of rapid development of rail transit. The business telephone system adopts the softswitch equipment networking to set the active and standby softswitch center equipment (SS) in the new line control center as the switching center for the new line and line network official telephone system and is in line with the other lines of the official telephone system of the rail transit and the municipal Public telephone network interoperability, while the new line set up softswitch center at the same time as the entire network softswitch center.