1.
If not, the call went to the company's in-house telephone switching system, or PBX (private branch exchange).
如果没有，电话就转到公司内的电话交换系统（即PBX，用户电话交换机）。
2.
Intranet Telephony: Will your LAN Replace Your PBX?
内部网电话：局域网会替代用户电话交换机吗？
3.
Intranet Telephony: Will your LAN Replace Your PBX? (2)
内部网电话：局域网会替代用户电话交换机吗？（2）
4.
Technical requirements and testing methods for crossbar private automatic branch exchange
GB/T5322-1985纵横制用户电话交换机技术要求和试验方法
5.
An IP Phone Scheme by Inter-Connecting Switching Equipment and Internet;
一种通过用户交换机接入Internet的IP电话
6.
Development of Phone Accounting System for PBX;
用户程控电话交换机通用计费程序的设计
7.
telex telegraph exchange
用户电报直通交换机
8.
automatic telex exchange
自动用户电报交换机
9.
SPC telex exchange
程控用户电报交换机
10.
"Mobile phone exchanges, base stations and mobile phone subscribers, such as portable phones, handsets and so on."
主要有移动电话交换机，基站及移动台用户。
11.
Electronic technology enables telephone exchanges to cover an ever increasing number of telephone communications.
电子技术使得电话交换机可以处理大批量的电话用户。
12.
A private telephone exchange that automatically connects internal "branch" lines to the external circuits of a telephone system.
一种自动地将内部用户线连接到电话系统外线的专用电话交换机。
13.
There are685,000 users of the internet over the city.
年末电话交换机总容量431.4万门，计算机互联网络用户68.5万户。
14.
private automatic telephone exchange
专用自动电话交换机
15.
railway telephone exchange
铁路专用电话交换机
16.
Subscriber line signalling system for telephone automatic switching network
GB3378-1982电话自动交换网用户信号方式
17.
Rural Telephone Subscribers refer to telephone subscribers, located at towns under county town and country, that are connected to the public line telephone network.
乡村电话用户数指县城关区以下的集镇和农村接入局用交换机的电话用户数。
18.
Generic specification for stored program control analogue private automatic branch telephone exchange system
GB/T14716-1993程控模拟用户自动电话交换机通用技术条件