Overview　：　

IP telephony is a new type of telephony communication through the Internet or other networks using IP technology. In the past, IP telephony was mainly used in the intranets of large companies. Technicians could reuse the same network to provide data and voice services, which not only simplified management, but also improved productivity. With the increasing popularity of the Internet and the surge in the number of cross-border communications, IP telephony has also been applied to long-distance telephone services. Due to the competition between communication companies in major cities in the world and the relaxation of relevant laws and regulations on telecommunications in various countries, IP telephony has also begun to be used in fixed-line communications. It is regarded as a strong competitor of traditional telecommunication services by current international telecommunication enterprises.

　composition　：　

Program-controlled digital exchange (PABX) is essentially a digital communication exchange controlled by computer software. The program-controlled telephone exchange is composed of hardware and software: the hardware includes the voice part, the control part and the input and output part. The software includes a program part and a data part.

The switch adopts a fully modular structure in hardware, and provides hardware products with high integration, high reliability, high function and low cost.

　Application　：　

The software adopts high-level language, and has a variety of system software designed for data exchange and connection, with powerful functions. To improve the utilization rate of telephones, each office desk can be configured with an extension number, and the relevant personnel can be found directly.