What is the data exchange technology used by IP phones?

The data exchange technology used by IP phones is "packet switching". IP telephony is a packetized and digital transmission technology based on IP technology. Its basic principle is: compress and encode the voice data through a voice compression algorithm, and then package the voice data according to IP and other related protocols, and then process it through the IP network. The data packets are transmitted to the receiving location, and then these voice data packets are strung together. After decoding and decompression, they are restored to the original voice signals, thereby achieving the purpose of transmitting voice over the IP network.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

The data exchange technology used by IP phones is packet switching.

The methods of data exchange technology are:

• Line switching. A physical path needs to be established before data is transmitted, and the path is fully occupied by a pair of users until the line is released.

• Message exchange. Messages are transmitted from the sender to the receiver using a store-and-forward method. When transmitting messages, only one path is occupied; buffering is required in the switching node, and messages need to be queued. Therefore, this method does not meet the requirements of real-time communication.

• Packet switching: Packet switching still uses the store-and-forward transmission method, but a long message is first divided into several shorter packets, and then these packets (carrying source and destination addresses and number information) are sent one by one. This is the most widely used switching technology in networks.

IP (VoIP for short, derived from the English VoiceoverInternetProtocol; also known as broadband phone or Internet phone) phone is a new method of telephone communication realized through the Internet or other networks using IP technology . As the Internet becomes more popular and the number of cross-border communications soars, IP phones are also used in long-distance phone services.

IP telephony is a packetized and digital transmission technology based on IP technology. Its basic principle is: compress and encode the voice data through the voice compression algorithm, and then convert the voice data into It is packaged according to IP and other related protocols, and the data packets are transmitted to the receiving place through the IP network. These voice data packets are then strung together, and after decoding and decompression, they are restored to the original voice signals, thereby achieving the purpose of transmitting voice over the IP network. .

Packet switching technology is developed when computer technology has developed to a certain extent. In addition to direct communication on the phone, people can communicate between computers through computers and terminals. However, the quality of transmission lines is not high and the network technology is relatively low. In a single situation, a switching technology emerged.

Compared with traditional phones, IP phones have the following advantages:

(1) Save bandwidth. The bandwidth consumed by a circuit switched phone is 64Kkbps. IP phones only require 6~8Kkbps (or even lower than 2.4Kkbps), thus saving bandwidth and reducing costs.

(2) Low call charges. The cost reduction has led to a decrease in call charges, especially for long-distance communications.

(3) Intelligence can be easily integrated. The IP telephone network inherits the intelligent module of the computer network and can flexibly control signaling and connections, which is conducive to the development of various value-added services.

(4) Open architecture. The IP phone protocol system is open, which is conducive to the standardization and interconnection of products from various manufacturers.

(5) Integration of multimedia services. The IP telephone network supports the transmission of voice, data, and images at the same time, laying the foundation for comprehensively providing multimedia services in the future.

For more related knowledge, please visit the FAQ column!

The above is the detailed content of What is the data exchange technology used by IP phones?. For more information, please follow other related articles on the PHP Chinese website!