Basic knowledge of public network walkie-talkies

Many people are curious about what a public network walkie-talkie is and how to use it. Today I will give you a brief explanation.
A more accurate understanding of public network walkie-talkies is that casual calls implemented by hardware can understand that the call software will no longer have this problem.
         Public network walkie-talkie is an Internet application of the public mobile communication network. Mobile phone calls and Internet access can connect to people at the far end because the mobile communication network covers most target urban areas. All applications based on this basic communication network no longer have the problem of "communication distance".

The communication distance of traditional walkie-talkies depends entirely on the performance of its own radio transceiver. The inherent nature of UV-band radio propagation determines that no matter how powerful a radio device is, its communication distance will not exceed tens of kilometers (theoretically, the communication distance of a communication device such as a walkie-talkie will not exceed a few kilometers). And this distance is not a constant value, it has a lot to do with the surrounding conditions used.
         The public network walkie-talkie just borrows the shell of the "walkie-talkie", but actually realizes the transmission essence of the voice signal carried by IP through the Internet (or possibly a private network).

How far a public network intercom can call depends on how wide the coverage of the public communication network is. Why is it usually only said that the communication distance is 5000kM? Because the distance between the two farthest points on the Chinese border is almost the same. When a public network walkie-talkie is moved overseas, communication is often no longer possible because of international roaming issues. In fact, as long as the public network intercom can be connected to the local communication network overseas, it can continue to talk. At this time, the communication distance of the public network intercom should be calculated in units of "10,000 kilometers".
         Precisely because public network walkie-talkies rely on the public mobile communication network to transmit information, its shortcomings are obvious. When there is no mobile communication network coverage, the walkie-talkie cannot make calls. This is when traditional walkie-talkies take advantage of them.

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