IC card telephone communication method based on frequency shift key control mode

Abstract

This invention discloses an IC phone communication method based on the FSK mode including: loading and transmitting ciphered sequences, ciphered card information, called number information and other interaction information between an IC terminal and a process platform in the mode of FSK information, in which, the platform authenticates the authority and charges, if the deduction at the IC terminal is correct, then it sends signals of anti-stealing making phone calls periodically to the platform, which differentiates the correctness of the signals, if they are wrong, it releases the call, when the communication is finished and the calling rings off first, the platform receives the identification signals of the ring-off of the calling to cut off the call of the called side and release the voice channel between the platform and the called side, then processes balance information and releases the call finally.

Description

Technical field [0001] The present invention relates to the field of smart public telephones, and in particular to a communication method for IC card telephones based on frequency shift keying (FSK). Background technique [0002] As a kind of public telephone, stored-value IC card telephones have been favored by consumers due to their national roaming, convenient and fast, and transparent consumption characteristics since they were launched in 1996. The current stored-value IC card telephone system mainly has two modes: 1. Offline mode, that is, all functions are concentrated on the terminal phone, that is, the charge rate and valid card data are stored in the terminal, and the terminal completes authentication, billing, and call. Route connection and call bill statistics. The problems of this offline method are: the call bills generated during the call cannot be counted in real time, resulting in the lack of real-time statistical data, the difficulty of rate management and termi...

AI Technical Summary

Problems solved by technology

The problems of this offline method are: the bills generated during the call cannot be counted in real time, resulting in a lack of real-time statistical data, difficulty in rate management and terminal management, and loopholes in fraudulent calls and fake cards; 2. Based on dual-tone multi-frequency (DTMF) online real-time communication method, that is, between the stored-value IC card terminal and the processing platform, DTMF is used as the information bearing method for information transmission ("Technical Requirements for Intelligent Public Telephone System", YD / T 1308-2004), to achieve real-time communication

After the rate is determined, the terminal also needs to send the remaining subsequent called numbers to the platform, so the process of determining the rate and the processing of the subsequent called numbers are quite cumbersome and complicated

[0022] 2. When the caller hangs up, the voice channel cannot be released in time, which wastes trunk resources

In the above step 15, when the calling party hangs up after the call ends, because it needs to send the balance information to the processing platform, it needs to maintain the communication path between the terminal and the processing platform before the balance is sent, so at this time the calling terminal does not Actually hang up, if the processing platform does not receive the caller’s hang-up signal, it will not cut off the call path on the called side, that is to say, after the calling terminal sends the balance and before receiving the verification code issued by the processing platform and actually hangs up , the voice path from the processing platform to the called side has been maintained, and has not been released in time, thus continuing to occupy trunk resources and correspondingly wasting resources

[0023] 3. The interaction time between the processing platform and the terminal is too long

Considering the impact of line transmission and the sensitivity and stability of DTMF signal reception in actual situations, DTMF signals often use a signal with a duration / interval time greater than 50ms, such as using a DTMF signal with a duration / interval time of 70ms, which makes it difficult in practice The entire information interaction time in the application will become longer

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