Learn about the basic principles of IP phone

Learn about the basic principles of IP phone

Learn about the basic principles of IP phone

The voice signal is compressed and encoded by the voice algorithm, and then the voice data is packaged according to the TCP/IP standard, and the network sends the data packet to the receiving place; the receiving and compression end serializes these voice data packets, and then decodes and decompresses them. After that, the original voice signal is restored, so as to achieve the purpose of sending voice from the Internet.

The IP phone system has four basic components:

Terminal equipment (Terminal), gateway (gateway), multipoint access gateway control unit MCU (Multipoint Control Unit) and gatekeeper (Gatekeeper).

(1) The terminal device is an IP phone terminal,

It can be software (such as VocalTec's IP.Phone, Microsoft's Netmeeting) to connect hardware (such as a dedicated Internet Phone), and it can directly carry out real-time voice or multi-body communication on the IP network.

(2) The gateway is the key device that provides PC-to-Phone, Phone-to-PC, and Phone-to-Phone voice communication through the IP network, and is the interface device between the IP network and the PSTN/ISDN/PBX network.

(3) The gatekeeper is responsible for user registration and management.

(4) The function of the multipoint access control unit (MCU) is to use the IP network to realize multipoint communication, and use IP phones to support some multipoint applications such as telephone network conferences.
IP phones use gateway technology, one side of the gateway is connected to a traditional circuit-switched network, such as PSTN, which can communicate with any external telephone; the other side of the gateway is connected

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