IC card telecommunication method based on frequency key control mode

Abstract

The invention discloses an IC card telephone communication method based on a frequency shift keying method, the main scheme of which is to carry and transmit encrypted sequence, encrypted card information, called number information and Other interactive information is authenticated and billed by the processing platform; if the IC card terminal deduction is correct, it will periodically send an anti-theft call signal to the processing platform, and the processing platform will identify the correctness of the anti-theft call signal, and release the call if it is wrong; When the caller hangs up first after the end, the processing platform first cuts off the call on the called side after receiving the caller’s on-hook identification signal, releases the voice path between the processing platform and the called side, and then processes the balance information and finally releases the call. Using the method proposed by the invention makes the information interaction process between the IC card terminal and the processing platform simpler and clearer, improves the information interaction efficiency, releases the voice channel in time, and saves relay resources.

Description

technical field [0001] The invention relates to the field of intelligent public telephones, in particular to a communication method for an IC card telephone based on frequency shift keying (FSK). Background technique [0002] As a kind of public telephone, the stored-value IC card telephone has been favored by consumers for its nationwide roaming, convenience, and transparent consumption since it was 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 tariff rate and valid card data are stored in the terminal, and the terminal completes authentication, billing, and phone calls. Line connection and bill statistics. 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 fra...

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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