In order to solve the internal and external telephone communication of the enterprise, it is composed of several shared external lines and independent internal lines. When an external call comes in, it can be answered by any internal telephone and can be transferred to the required called party. The PBX does not require full-time operators and maintenance personnel, each of which can understand the working conditions of the entire system through indicator lights.

A common type of outside line

1. Analog line, the most common outside telephone line, you can apply directly to the supplier (Telecom, China Mobile, China Unicom, etc.), the monthly rent is cheap, easy to use, 1 line and 1 phone

2. Optical fiber line, which is directly connected to the home through optical fiber, has multiple functions, and has the same number of internal and external lines. It can allow multiple telephones to call in and out at the same time, and it is both a straight line and an extension, and the price is more expensive.

Two common switch brand types

1. Guowei telephone exchange, the most common analog telephone exchange, can realize up to 48 outside lines + 200 inside lines

2. Panasonic telephone switch, more reliable function and higher level choice

3. Cisco, avaya and other international well-known brand telephone switches can be connected to fiber optic telephone lines, suitable for multi-office, cross-province, international environment deployment, powerful functions, cheap communication costs, but the initial investment is expensive

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