CN100571318C - IC Card Telephone communication means based on frequency deviation key control mode - Google Patents
IC Card Telephone communication means based on frequency deviation key control mode Download PDFInfo
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- CN100571318C CN100571318C CNB2005100852407A CN200510085240A CN100571318C CN 100571318 C CN100571318 C CN 100571318C CN B2005100852407 A CNB2005100852407 A CN B2005100852407A CN 200510085240 A CN200510085240 A CN 200510085240A CN 100571318 C CN100571318 C CN 100571318C
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Abstract
The invention discloses a kind of IC Card Telephone communication means based on frequency deviation key control mode, its major programme is to carry and transmission ciphering sequence, encrypted card information, called number information and other mutual information by the FSK information mode between IC-card terminal and the processing platform, carries out authentication and charging by processing platform; Periodically send antitheft giving a signal to processing platform if the IC-card terminal is deducted fees correctly, processing platform is differentiated antitheft correctness of giving a signal, if mistake then call release; When behind the sign off during on-hook of caller elder generation, at first cut off the calling of callee side behind processing platform receives that The Calling Party Hooks On the id signal, discharge the speech channel between processing platform and the callee side, and then carry out the processing and the last call release of balance amount information.The method of using the present invention to propose makes that the information interaction flow process between IC-card terminal and the processing platform is simpler, clear, has improved information interaction efficient, and can in time discharge speech channel, saves relay resource.
Description
Technical field
The present invention relates to the intelligent public telephone field, specifically, relate to a kind of communication means of the IC Card Telephone based on frequency shift keying (FSK) mode.
Background technology
The Stored Value IC Card Telephone is a kind of as public telephone, since 1996 release, with its whole nation roaming, convenient and swift, characteristics such as consumption is transparent, has obtained consumers in general's favor.Present Stored Value IC Card Telephone system mainly contains two kinds of patterns: one, off-line type, be about to repertoire and all concentrate on the terminal phone, promptly rate, effectively block data storage in terminal, by terminal finish authentication, charging, speech channel continues and the ticket statistics.The problem that this offline mode exists has: the ticket that produces in the communication process can not real-time statistics, causes statistics to lack real-time, and there are the leak of free call on sb. else's expense through illegal means and pseudo-card in tariff management and terminal management difficulty; Two, based on the online in real time communication mode of Dual Tone Multifrequency mode, be to carry out message transmission (" intelligent public telephone system specification requirement " with DTMF as the bearing mode of information between Stored Value IC-card terminal and the processing platform, YD/T 1308-2004), realize real time communication.In " intelligent public telephone system specification requirement " (YD/T 1308-2004) standard, stipulated based on the Stored Value IC-card terminal of DTMF mode and the call flow interaction protocol between the processing platform, specific as follows:
1, user's off-hook, plug-in card is dialled called number, and terminal is dialled access code automatically and is inserted processing platform;
2, processing platform issues ciphering sequence to terminal;
3, terminal sends card information to processing platform, contains card number, information such as password, remaining sum;
4, processing platform is verified card information, issues identifying code to terminal.As verify correctly, then continue next step; Otherwise, call release;
5, terminal sends the part called number of buffer memory to processing platform;
6, processing platform is determined rate according to the information of receiving such as part called number.If can't determine rate, then processing platform issues identifying code C# to terminal.
7, after terminal is received identifying code C#, continue to send remaining called number to processing platform.Processing platform is determined rate again according to the information of receiving such as part called number.Like this, carry out step 6 repeatedly, till rate can be determined;
8, processing platform comprises rate information, residue called number length etc. to the terminal distributing bill information in the charge information;
9, terminal sends the rate identifying code to processing platform.As verify correctly, then continue next step; Otherwise, triplicate step 7;
10, terminal sends remaining called number to processing platform;
11, processing platform continues called;
12, after called off-hook was replied, processing platform issued fee charging signal to terminal.Terminal begins to deduct fees after receiving fee charging signal.Deduct fees correctly as terminal, send pulse signal to platform; Deduct fees as terminal and to make mistakes, then hanging up terminal carry out step 15.
13, processing platform is verified the pulse signal of receiving at every turn, and as correctly, then calling and called both sides conversation is proceeded next step; As incorrect, call release then;
14, terminal begins to deduct fees when next time of day arrives.Deduct fees correctly as terminal, then periodically send pulse signal, carry out step 13 to platform; Deduct fees as terminal and to make mistakes, then hanging up terminal carry out step 15.
When 15, The Calling Party Hooks On, terminal sent balance amount information to processing platform;
16, processing platform is verified balance amount information, and after terminal sends identifying code call release;
17, hanging up terminal discharges.
There is following shortcoming in actual applications in above-mentioned interaction flow:
1, determines rate and loaded down with trivial details, complicated to the processing procedure of called number.Above interaction flow adopts the terminal buffers dial mode, dials in the process of called number the user, carries out determining with mutual of charge information simultaneously.Because this moment, the called number of buffer memory also was not complete called number, therefore there is the situation that still can't determine rate according to this part called number, called number such as buffer memory is 89, and the called number prefix of determining the minimum position that rate needs is 8902, and the mutual ability that needs processing platform and terminal to carry out repeatedly follow-up called number is like this determined rate information.After rate was determined, terminal also needed to send remaining follow-up called number to platform, and the process of definite like this rate and the processing procedure of follow-up called number are quite loaded down with trivial details and complicated.
When 2, The Calling Party Hooks On, can't in time discharge speech channel, the waste relay resource.In above-mentioned steps 15, when The Calling Party Hooks On behind end of conversation, because it will send balance amount information to processing platform, need to keep terminal to pat speech channel between the platform everywhere before under remaining sum, distributing, so this moment, calling terminal did not have actual on-hook, processing platform can not receive that The Calling Party Hooks On signal, just can not cut off the speech channel of callee side yet, that is to say after under calling terminal, distributing remaining sum to receiving before the identifying code and real on-hook that processing platform issues, speech channel from the processing platform to the callee side is keeping always, in time do not discharge, so just hold over relay resource, wasted resource accordingly.
3, the mutual overlong time between processing platform and the terminal.Above interaction flow is with the bearing mode of DTMF as information.According to the dtmf signal standard of stipulating in " intelligent public telephone system specification requirement " (YD/T 1308-2004) standard, dtmf signal continue/should be 50-70ms blanking time.The 50ms of the continuing of the minimum that needs according to dtmf signal/blanking time calculates, and the time of transmitting a dtmf signal is at least 100ms, and the dtmf signal that per second transmits mostly is 10 most.In above interaction flow, probably about 60, so mutual time needs 6 seconds to message lengths such as ciphering sequence information, card information, called number information, charge information at least.And this only is the value of continue/calculating blanking time according to the minimum of the desirable needs of dtmf signal.In actual conditions, consider the influence of circuit transmission and sensitivity and the stability that dtmf signal receives, dtmf signal often adopts and is the signal greater than 50ms lasting/blanking time, as to adopt lasting/blanking time be the dtmf signal of 70ms, and this makes whole in actual applications information interaction time can become longer.
Summary of the invention
Purpose of the present invention is exactly the communication means that proposes that a kind of reciprocal process is simple, interactive speed fast and can in time discharge the IC Card Telephone of speech channel.
IC Card Telephone communication means based on frequency deviation key control mode comprises the following steps:
The first step: terminal is dialled access code and is inserted processing platform;
Second step: processing platform sends the FSK message that contains ciphering sequence to terminal;
The 3rd step: terminal is encrypted card information according to the ciphering sequence of receiving, and the card information after will encrypting is uploaded to processing platform by FSK message;
The 4th step: processing platform is verified the card information of receiving, then issues the FSK message of affirmation if the verification passes to terminal, otherwise finishes after terminal issues the FSK message of refusal and call release;
The 5th step: terminal is uploaded the FSK message that contains called number to processing platform;
The 6th step: processing platform obtains charge information according to the calling and called number and issues the FSK message that contains charge information to terminal;
The 7th step: processing platform continues called, and behind the called party answer, processing platform issues to terminal and contains the FSK message that starts fee charging signal;
The 8th step: terminal begins to deduct fees according to charge information after receiving and starting fee charging signal, if deduct fees correctly then periodically send antitheft giving a signal to processing platform, otherwise carries out for the 11 step;
The 9th step: processing platform verifies antitheft the giving a signal of receiving at every turn, if correctly then continue, otherwise the processing platform call release;
The tenth step: The Calling Party Hooks On behind the end of conversation;
The 11 step: terminal is to the processing platform id signal that sends that The Calling Party Hooks On;
The 12 step: cut off the calling of callee side behind processing platform receives that The Calling Party Hooks On the id signal, discharge the speech channel between processing platform and the callee side;
The 13 step: processing platform issues the FSK message that contains balance request to terminal;
The 14 step: terminal is uploaded the FSK message that contains balance amount information to processing platform;
The 15 step: processing platform issues release message and call release to terminal after receiving balance amount information;
The 16 step: finish behind the terminal call release.
The communication means that between Stored Value IC-card terminal and processing platform, carries out information interaction that the present invention proposes based on the FSK mode, compare with the communication means of stipulating in " intelligent public telephone system specification requirement " standard in the prior art and to have following advantage:
1, interaction flow is simple, clear.The present invention does not need to adopt the buffer memory dial mode, terminal is disposable to send to processing platform with called number, processing platform is according to the disposable definite rate of complete called number, do not need terminal repeating to send follow-up called number and determine rate, also do not need the processing to follow-up called number, processing procedure is simple, clear.
When 2, The Calling Party Hooks On, can in time discharge speech channel, save relay resource.The remaining sum that the present invention proposes after The Calling Party Hooks On issues in the mode, and at end of conversation, before The Calling Party Hooks On and terminal begins to send remaining sum, processing platform can in time cut off the calling of callee side, discharges speech channel, can save relay resource.
3, the mutual time shortens greatly.The present invention adopts FSK to carry out the bearing mode of information.Transmission standard according to fsk signal, fsk signal adopts binary system, logical one/0 frequency of continuous phase to be respectively the binary signal of digital modulation of 1200HZ/2400HZ (ITU-T V.22) or 1300HZ/2100HZ (ITU-T V.23) with 1200 bps transmission, per second can transmit 16 system number of characters and can reach 150 in theory, than the DTMF mode, the efficient of FSK mode is more than 10 times of DTMF, has significantly reduced the time overhead of information interaction between terminal and the platform like this.
Description of drawings
Fig. 1 is the flow chart of the method that proposes of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
In Fig. 1 except that access code, antitheftly give a signal, The Calling Party Hooks On, and id signal uses the dtmf signal, other information interaction all adopts two-way FSK load mode between processing platform and the terminal.Processing platform can be an intelligent network platform, also can be special-purpose intelligent public phone platform, has the transmitting-receiving processing capacity of fsk signal.Terminal is the intelligent terminal of DTMF/FSK standard, has dtmf signal, fsk signal transmitting-receiving processing capacity.Carry out information interaction according to the information interaction flow process among Fig. 1 between terminal and the processing platform.During specific implementation, it is the fsk signal that 1200 bps, logical one/0 frequency are respectively 1200HZ/2400HZ (ITU-T V.22) or 1300HZ/2100HZ (ITU-T V.23) that fsk signal adopts binary system, the transmission speed of continuous phase.Each FSK information comprises synchronous guiding string, information type, message length, the information content and verification and several sections.The speech channel of having set up between terminal and the processing platform is directly used in the transmission of fsk signal, is encapsulated as " frame " (perhaps packets of information) according to set form and transmits end to end.Wherein the information content adopts 16 systems to transmit according to following form: message identifier A+ message entity B.Message identifier is the sign that carries out message identification, and terminal and processing platform identify with this and carry out information Recognition and judgement.For example, the message format among the present invention can be with representing as table 1 mode:
Table 1:
| Message name | Message identifier | Message content | Explanation |
| Ciphering sequence | A 1 | Random number | |
| Card information | A 2 | Content comprises phone identification code, card number information, balance amount information, check code etc. | |
| Authorization information | A 3 | Content comprises to be confirmed or refusal information | Confirmation represent the checking pass through; Refusal information representation checking is not passed through. |
| Called number | A 4 | Called number (elongated) | |
| Charge information | A 5 | Content comprises type codes (a), charge information (b 1b 2... b n), check code (m). | Type codes (a), charge information b1 b2...bn), the specific definition of check code (m) meets the requirement in " intelligent public telephone system specification requirement " (YD/T 1308-2004) standard. |
| Balance request | A 6 | ||
| Balance amount information | A 7 | Content comprises remaining sum, this amount of money of deducting fees, this information such as number of times of deducting fees | |
| Fee charging signal | A 8 | ||
| Antitheft giving a signal | A dtmf signal that changes | ||
| The Calling Party Hooks On id signal | Two fixing dtmf signals |
Terminal is the card information through encrypting at the card information of uploading to processing platform among Fig. 1.Terminal and processing platform obtain encrypted result (ciphertext Z) according to ciphering sequence according to cryptographic algorithm.Terminal is encrypted card information according to ciphertext Z, and processing platform is decrypted card information according to ciphertext Z.The authentication to card information among Fig. 1 comprises the evaluation of remaining sum in the evaluation, card of card validity etc.Antitheft giving a signal produces according to ciphertext Z.For effectively prevent in communication process by button operation (dtmf signal: 0～9, *, #) the antitheft situation of giving a signal free call on sb. else's expense through illegal means of simulation produces the antitheft r of giving a signal in one embodiment of the invention in the following manner:
r
n=(z
nMod 3+14) ﹠amp; 15 (n=1～6, z
nA certain position for ciphertext)
Antitheft giving a signal according to r
1r
2r
3r
4r
5r
6Order circulate.
In the present invention, realizing behind the end of conversation terminal when processing platform sends balance facilit, after the on-hook of caller elder generation, terminal is to the processing platform id signal that sends that The Calling Party Hooks On, but unactual on-hook.Processing platform cuts off the callee side calling after receiving this signal immediately, discharges the speech channel of callee side, and sends balance request message to calling terminal.After terminal is received balance request message, send remaining sum message to processing platform.Processing platform is verified balance amount information, sends authorization information to terminal.And when Called Onhook, processing platform cuts off automatically to the speech channel of callee side, and processing platform also is in on-state to the speech channel of Calling Side, and at this moment processing platform can directly send balance request message to terminal.But because microphone, the receiver of calling terminal also are in open mode, in time turn off microphone, receiver in order to make calling terminal, avoid allowing the user hear DTMF or the mutual sound of signal, processing platform can be taked certain mode, as sending howler tone to terminal, perhaps send the disconnected mode of FSLAH sudden strain of a muscle and notify calling terminal timely on-hook, turn off microphone, receiver to terminal.When the calling terminal on-hook, the flow process that enters that The Calling Party Hooks On.
In order to distinguish antitheft the giving a signal that terminal sends in the communication process, The Calling Party Hooks On, and id signal adopts fixing two dtmf signal (for example a#) to identify.
Be intelligent network platform with the processing platform below, the mode that adopts processing platform to send howler tone when Called Onhook is notified the calling terminal on-hook, describes implementation process of the present invention in detail in conjunction with Fig. 1:
The first step, user's off-hook, plug-in card is dialed called number.IC-card terminal with fsk signal transmitting-receiving processing capacity is dialled access code inserts processing platform by communication network Service Switching Point automatically.
Second step had the SSP interception calling that the fsk signal function is handled in transmitting-receiving, after handling by Service Control Point, set up the speech path connection between terminal and the processing platform earlier.
In the 3rd step, SCP uses expansion Intelligent Network Application Protocol (INAP) operation (being called for short expansion INAP operation, as follows) and the SSP that comprise fsk signal transmitting-receiving processing capacity to communicate, and sends ciphering sequence message by the speech channel of having set up to the IC-card terminal.
In the 4th step, the IC-card terminal is encrypted card information according to cryptographic algorithm according to the ciphering sequence of receiving, and sends the card information of encrypting by the speech channel of having set up to the SSP of processing platform.The SCP of processing platform communicates receiving card information by expansion INAP operation and SSP.
In the 5th step, processing platform is decrypted card information and card information is carried out authentication, comprises card validity, the effective evaluation of remaining sum etc.Pass through as authentication, SCP uses expansion INAP operation and SSP to communicate, and by the speech channel of having set up after IC-card terminal transmission acknowledge message, proceed next step; Do not pass through as authentication, SCP uses expansion INAP operation and SSP to communicate, and sends refuse information by the speech channel of having set up to the IC-card terminal, finishes behind the call release.
In the 6th step, the IC-card terminal sends called number information by the speech channel of having set up to the SSP of processing platform.The SCP of processing platform communicates by expansion INAP operation and SSP, receives called number information.
In the 7th step, processing platform is determined charge information according to information such as calling number, called numbers, and uses expansion INAP operation and SSP to communicate, and sends charge information by the speech channel of having set up to the IC-card terminal.
In the 8th step, the charge information that the IC-card end-on is received is verified, and is sent checking results messages (confirming or refuse information) by the speech channel of having set up to the SSP of processing platform.The SCP of processing platform communicates by expansion INAP operation and SSP, receives the authorization information that the IC-card terminal is put forward.As be acknowledge message, then proceed next step; Otherwise, the processing platform call release.
In the 9th step, processing platform continues called by SSP and communication network.
In the tenth step, behind the called party answer, the SCP of processing platform uses expansion INAP operation and SSP to communicate, and starts fee charging signal message by the speech channel of having set up to the transmission of IC-card terminal.
In the 11 step, the IC-card terminal begins to deduct the fee from IC-card at the time of day place according to charge information after receiving and starting fee charging signal message.Deduct fees correctly as the IC-card terminal, then the IC-card terminal sends antitheft giving a signal by the speech channel of having set up to the SSP of processing platform, and SSP reports the SCP of processing platform with antitheft giving a signal; As the failure of deducting fees of IC-card terminal, the handling process of carrying out then that The Calling Party Hooks On in the 14 step.
In the 12 step, processing platform SCP judges antitheft the giving a signal that the IC-card terminal sends up.As correctly, then both sides continue conversation, proceed next step; As incorrect, the SCP call release of processing platform then.
In the 13 step, if called first on-hook, processing platform send howler tone to caller IC-card terminal.After the IC-card terminal is received howler tone, to the SSP of the processing platform id signal that sends that The Calling Party Hooks On, report SCP after SSP receives, entered for the 16 step then by the speech channel of having set up.And during the on-hook of caller elder generation, then directly carried out for the 14 step.
In the 14 step, the IC-card terminal to the SSP of the processing platform id signal that sends that The Calling Party Hooks On, reports SCP after SP receives by the speech channel of having set up.
In the 15 step, behind the SCP of processing platform receives that The Calling Party Hooks On the id signal, SSP cuts off the calling of callee side, discharge and callee side between speech channel.
In the 16 step, SCP uses expansion INAP operation and SSP to communicate, and by the speech channel of having set up to IC-card terminal balance request message.
In the 17 step, after the IC-card terminal is received balance request message, send balance amount information to the SSP of processing platform by the speech channel of having set up.The SCP of processing platform communicates by expansion INAP operation and SSP, and the reception balance amount information is also verified.
In the 18 step, the SCP of processing platform uses expansion INAP operation and SSP to communicate, and sends release message by the speech channel of having set up to the IC-card terminal.
The 19 step, IC-card terminal call release, call release behind the SCP call list of processing platform.
Claims (16)
1, based on the IC Card Telephone communication means of frequency deviation key control mode, it is characterized in that comprising the following steps:
The first step: terminal is dialled access code and is inserted processing platform;
Second step: processing platform sends the FSK message that contains ciphering sequence to terminal;
The 3rd step: terminal is encrypted card information according to the ciphering sequence of receiving, and the card information after will encrypting is uploaded to processing platform by FSK message;
The 4th step: processing platform is verified the card information of receiving, then issues the FSK message of affirmation if the verification passes to terminal, otherwise finishes after terminal issues the FSK message of refusal and call release;
The 5th step: terminal is uploaded the FSK message that contains called number to processing platform;
The 6th step: processing platform obtains charge information according to the calling and called number and issues the FSK message that contains charge information to terminal;
The 7th step: processing platform continues called, and behind the called party answer, processing platform issues to terminal and contains the FSK message that starts fee charging signal;
The 8th step: terminal begins to deduct fees according to charge information after receiving and starting fee charging signal, if deduct fees correctly then periodically send antitheft giving a signal to processing platform, otherwise carries out for the 11 step;
The 9th step: processing platform verifies antitheft the giving a signal of receiving at every turn, if correctly then continue, otherwise the processing platform call release;
The tenth step: The Calling Party Hooks On behind the end of conversation;
The 11 step: terminal is to the processing platform id signal that sends that The Calling Party Hooks On;
The 12 step: cut off the calling of callee side behind processing platform receives that The Calling Party Hooks On the id signal, discharge the speech channel between processing platform and the callee side;
The 13 step: processing platform issues the FSK message that contains balance request to terminal;
The 14 step: terminal is uploaded the FSK message that contains balance amount information to processing platform;
The 15 step: processing platform issues release message and call release to terminal after receiving balance amount information;
The 16 step: finish behind the terminal call release.
2, method according to claim 1, it is characterized in that: after described the 6th step, terminal verifies charge information after receiving charge information, and uploads to processing platform and to contain the FSK message of verifying the result, is that checking is by information then continued to carry out the 7th step if processing platform receives; Otherwise call release.
3, method according to claim 1, it is characterized in that described the 8th step specifically comprises: terminal begins to deduct fees from IC-card after starting fee charging signal receiving, and when each time of day arrival subsequently, deduct fees, if deduct fees correctly then periodically send antitheft giving a signal, otherwise carried out for the 11 step to processing platform.
4, method according to claim 1, it is characterized in that in the described step 10, if called first on-hook, then processing platform sends cue to calling terminal, calling terminal receives after the cue to the processing platform id signal that sends that The Calling Party Hooks On, carries out for the 13 step behind processing platform receives that The Calling Party Hooks On the id signal.
5, method according to claim 1, it is characterized in that in described the 15 step, processing platform is also verified balance amount information after receiving balance amount information, issues the FSK message that contains authorization information to terminal then, issues release message and call release to terminal at last.
6,, it is characterized in that processing platform is verified the card information of receiving and is meant that processing platform is decrypted and authentication the card information that receives in described the 4th step according to each described method of claim 1-5.
7, method according to claim 6 is characterized in that described authentication comprises the evaluation that the validity and the card of IC-card are gone up remaining sum.
8,, it is characterized in that described antitheft give a signal and The Calling Party Hooks On that id signal transmits in the dtmf signal mode according to each described method of claim 1-5.
9,, it is characterized in that described fsk signal is that binary system, the transmission speed of continuous phase is the fsk signal that 1200 bps, frequency are respectively 1200HZ/2400HZ or 1300HZ/2100HZ according to each described method of claim 1-5.
10, method according to claim 9 is characterized in that described fsk signal is encapsulated as frame or message bag according to established form, uses the speech channel of having set up between terminal and the processing platform to transmit end to end.
11, method according to claim 10 is characterized in that described information transmitted content adopts 16 systems to transmit according to the form of " message identifier+message entity ".
12, according to each described method of claim 1-5, it is characterized in that described second step specifically comprises: the interception of the Service Switching Point of processing platform is called out, and after handling by service control point, sets up the speech path connection between terminal and the processing platform earlier; Service control point uses the operation of expansion Intelligent Network Application Protocol and the Service Switching Point that comprise fsk signal transmitting-receiving processing capacity to communicate, and sends ciphering sequence message by the speech channel of having set up to terminal.
13, method according to claim 8 is characterized in that described antitheft giving a signal is periodic heartbeat signal.
14, method according to claim 8 is characterized in that described The Calling Party Hooks On id signal is two fixing dtmf signal.
15, method according to claim 4 is characterized in that described cue is the howler tone signal or dodges break signal.
16, method according to claim 13 is characterized in that described antitheft giving a signal represent with r, produces according to ciphertext Z, and the production method of the antitheft r of giving a signal is:
r
n＝(z
n?mod?3+14)&15，
Wherein, n=1～6, z
nBe a certain position of ciphertext,
Antitheft giving a signal according to r
1r
2r
3r
4r
5r
6Order circulate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100852407A CN100571318C (en) | 2005-07-21 | 2005-07-21 | IC Card Telephone communication means based on frequency deviation key control mode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100852407A CN100571318C (en) | 2005-07-21 | 2005-07-21 | IC Card Telephone communication means based on frequency deviation key control mode |
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| Publication Number | Publication Date |
|---|---|
| CN1901589A CN1901589A (en) | 2007-01-24 |
| CN100571318C true CN100571318C (en) | 2009-12-16 |
Family
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|---|---|---|---|
| CNB2005100852407A Expired - Fee Related CN100571318C (en) | 2005-07-21 | 2005-07-21 | IC Card Telephone communication means based on frequency deviation key control mode |
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| Country | Link |
|---|---|
| CN (1) | CN100571318C (en) |
-
2005
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Non-Patent Citations (2)
| Title |
|---|
| 智能公用电话***技术要求. 中华人民共和国通信行业标准，第YD/T 1308-2004期. 2004 |
| 智能公用电话***技术要求. 中华人民共和国通信行业标准，第YD/T 1308-2004期. 2004 * |
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| Publication number | Publication date |
|---|---|
| CN1901589A (en) | 2007-01-24 |
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