Abstract: Introduction to Telephone Knowledge-Classification of Features: It mainly describes that telephones are mainly divided into ordinary telephones, telephones with memory function, semi-hands-free telephones, full hands-free telephones, telephones with long-distance lock, VOIP telephones, etc., and Describe its functions in detail. Types and functions of telephone sets As the manufacturer of the most widely used and largest number of telecommunication terminal equipment on the communication network, Shenzhen East Line has become an indispensable part of people's life and work. The telephone industry grew from small to large, and reached its heyday around 1996, when there were about 400 telephone manufacturers. Due to intensified competition, some small companies have difficulty gaining a foothold, gradually closing down or changing jobs. In recent years, the number of telephone manufacturers has shown a downward trend. At present, there are nearly 200 manufacturers entering ...
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