在传统的(电话)基础设施中，通话是通过用户电话交换机(PBX)进入路由、送至当地的电话运营公司。
In a traditional infrastructure, calls get routed through a PBX and out to the local telephone operating company.
当与用户电话交换机（pbx）一起工作的voip解决方案加入时，内部通话通过pbx进入路由，而长途电话通过voip解决方案进入路由。
When a VOIP solution that works in conjunction with the PBX is added, internal calls are routed through the PBX and long distance calls are routed through the VOIP solution.
电子技术使得电话交换机可以处理大批量的电话用户。
Electronic technology enables telephone exchanges to cover an ever increasing number of telephone communications.
工作职责：管理维护公司的用户电脑以及服务器，门禁系统，电话交换机。
Responsibilities: management and take care of company computers and server, door keeping system and telephone switch.
工作职责：管理维护公司的用户电脑以及服务器，门禁系统，电话交换机。
Responsibilities: management and take care of company computers and server, door keeping system and telephone switch.
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