CN101485183A - Method and apparatus for providing and using a telephone calling card - Google Patents
Method and apparatus for providing and using a telephone calling card Download PDFInfo
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- CN101485183A CN101485183A CNA2007800248096A CN200780024809A CN101485183A CN 101485183 A CN101485183 A CN 101485183A CN A2007800248096 A CNA2007800248096 A CN A2007800248096A CN 200780024809 A CN200780024809 A CN 200780024809A CN 101485183 A CN101485183 A CN 101485183A
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Abstract
Method and apparatus for providing and using a telephone calling card are described. In one example, a planar body incudes a memory system, a dual-tone multi-frequency (DTMF) generator, and a speaker. The memory system is configured to store identification data for allowing a user to place a telephone call. The DTMF generator is coupled to the memory system and is configured to generate password-protected DTMF tones to convey the identification data. The speaker is coupled to the DTMF generator and is configured to emit the DTMF tones. The DTMF tones may be played into a telephone for making a call using the telephone calling card apparatus. Since the identification data is played into the telephone and password-protected, rather than being manually entered by the user, the identification data is less susceptible to unauthorized disclosure and thus less susceptible to fraudulent use.
Description
The application requires the priority of the U.S. Provisional Application 60/817,409 of submission on June 30th, 2006, and this application here all is incorporated herein by reference.
Technical field
The present invention relates generally to telephone system, relates in particular to a kind of method and apparatus that is used to provide and use telephone calling card.
Background technology
The purposes of telephone calling card is well-known.For example, client might receive that a permission charges into telephone call charges the phonecard of clients account.Usually, the user need dial with call card and handle the number that service is associated, and will be prompted to dial in certain number of the account and personal identification number (PIN), so that carry out authentication vs. authorization.Authorize and checking in case finished, then can point out calling party to dial called number, and calling charge will be credited to clients account.If revealed number of the account and PIN to unauthorized user, this class call card is easy to meet with fraud so.A kind of well-known swindle technology is that the people who uses call card to call out is monitored.By monitoring and write down the number of dialling in phone that someone can determine to enter the required number of dialing of account, can use the account to carry out unwarranted call thus.
In the technology that is used for resisting this type of fraud, wherein a kind of Technology Need uses the special phone with magnetic card reading.Account and PIN information are built in the magnetic stripe on the call card.When the card holder wishes to use call card, described card will be inserted into magnetic card reading, at this moment then can read account and PIN information.This method that reads account and PIN information has automatically been eliminated the user and has been used numeric keypad to dial the necessity of information.Thus, account and PIN information can not revealed to monitoring user because of carelessness and be made telephonic the 3rd people.But there is a significant deficiency in this technology, and that is exactly that this call card can only be used with those phones of having the ability to read magnetic stripe.
Correspondingly, need a kind of method and apparatus that is used to provide and use telephone calling card in the art, wherein said method and apparatus has stoped fraud, and does not need to use special telephone plant.
Summary of the invention
One aspect of the present invention relates to a kind of call card apparatus.One planar body comprises: accumulator system, Dual Tone Multifrequency maker and loud speaker.Accumulator system is configured to store the identification data that those allow user's telephone calling.The DTMF maker is connected with accumulator system, and is configured to produce the dtmf tone accent, so that transmit identification data.Loud speaker is connected with the DTMF maker, and is configured to send the dtmf tone accent.Dtmf tone is transferred and can be played in the phone, so that use the call card apparatus to make a call.Because identification data (for example number of the account and/or personal identification number) is played in the phone, therefore, manually to import identification data different with the user, and this identification data is subjected to unwarranted leakage not too easily, meets with rogue thus not too easily and uses.
What another aspect of the present invention related to is to handle call.Receive the Dual Tone Multifrequency tone that produces by the DTMF maker on the call card from first end points.This dtmf tone is transferred and is transmitted the data that are associated with the user.This identification data is verified.Obtain the telephone number of calling there from the user.This calling is routed to second end points that is associated with telephone number from first end points.In certain embodiments, first and second end points are connected with PSTN (PSTN).This calling is routed via packet network.So, the calling between the non-subscriber of use internet protocol voice (VoIP) technology can use voip technology to handle.
Description of drawings
By reference example, the more detailed description of the present invention that can as above be summarized, understood in detail above-mentioned feature of the present invention thus, wherein some embodiment is in the accompanying drawings by illustration.Yet should be noted that, accompanying drawing only illustration exemplary embodiments of the present invention, should not be considered to thus its scope is limited, for purposes of the invention, it allows to have same effectively other embodiment.
Fig. 1 is a block diagram of describing the illustrative embodiments of the communication system of one or more aspects according to the present invention;
Fig. 2 describes the flow chart of illustrative embodiments that the method for call is handled in according to the present invention one or more aspects;
Fig. 3 is a block diagram of describing the illustrative embodiments of the safety call card of one or more aspects according to the present invention;
Fig. 4 is a block diagram of describing another illustrative embodiments of the communication system of one or more aspects according to the present invention; And
Fig. 5 describes the block diagram of another illustrative embodiments that the method for call is handled in according to the present invention one or more aspects.
Embodiment
Fig. 1 is a block diagram of describing the illustrative embodiments of the communication system 100 of one or more aspects according to the present invention.This communication system 100 comprises first end points 102, one or more communication networks 104, call processing device 106 and second end points 107.Communication network 104 can comprise various types of circuit switching and/or packet network, and these networks can comprise PSTN (PSTN), internet protocol voice (VoIP) network, internet or the like.More detailed example about communication network 104 is described with reference to Figure 4 hereinafter. End points 102 and 107 can comprise the various device that can receive call via communication network 104, comprises Time Division Multiplexing phone (routine call just), Internet Protocol (IP) phone, computer or the like.Except well-known element, end points 102 and 107 also comprises and is used to catch the microphone 108 of sound and the loud speaker 110 that is used to sound.
In certain embodiments, call out and to be to use secure phone calls card (" safety call card 114 ") and to initiate to end points 107 from end points 102.This safety call card 114 has been got rid of the needs that user 116 dialed or otherwise imported the safe private data of number of the account and/or PIN number and so on.On the contrary, this safety call card 114 is configured to produce and play a Dual Tone Multifrequency pitch sequences when receiving user 116 order.It is identification data in order to telephone calling that this dtmf tone is transferred what transmit, for example number of the account and/or PIN number.User's 116 these safety call cards 114 of location are transferred so that the microphone 108 of first end points 102 is caught dtmf tone.So, safety call card 114 has greatly reduced the third party illegally obtains private data (for example PIN) when user 116 uses described card risk.The illustrative embodiments of safety call card 114 will be described hereinafter.
Fig. 2 describes the flow chart of illustrative embodiments that the method 200 of call is handled in according to the present invention one or more aspects.This method can be understood with reference to the system of figure 1.Method 200 starts from step 202, and wherein user 116 produces the dtmf tone accent by activating safety call card 114, transfers so that the microphone 108 of first end points 102 captures dtmf tone.What in certain embodiments, dtmf tone was transferred transmission is the telephone number (for example free call numbers that are associated with a certain class call card) of call processing device 106.In other embodiments, before the dtmf tone accent was played to first end points 102, user 116 is the telephone number of place calls processor 106 at first.Any situation no matter, dtmf tone is transferred all also to have transmitted and is allowed user's 116 call card 114 safe in utilization to come the identification data of telephone calling, for example number of the account, PIN or these two.
In step 204, call processing device 106 receives and handles dtmf tone and transfers, so that the checking identification data.In step 206, will determine wherein whether identification data is effective.For example, determined can be number of the account whether effectively and exist, whether whether whether the PIN number that is associated with account effective, account can be used to make a call (for example have on the account pre-payment minute) or the like.If identification data is effective, method 200 proceeds to step 208 so.Otherwise this method 200 proceeds to step 207, wherein will refusing user's 116 call card 114 safe in utilization.
In step 208, call processing device 106 prompting users import telephone number, for example the telephone number of second end points 107.In step 210, call processing device 106 receives telephone number from user 116 (for example user in response to described prompting and use first end points 102 to import telephone number).In step 212, call processing device 106 will be called out from first end points 102 and be routed to second end points 107.For example, call processing device 106 impels incoming call of second end points, 107 indications.If reply this incoming call on second end points 107, call processing device 106 will assist to finish being connected via communication network 104 between first end points 102 and second end points 107 so.
Fig. 3 is a block diagram of describing the illustrative embodiments of the safety call card 114 of one or more aspects according to the present invention.Safety call card 114 comprises the main body 302 that is generally the plane.Main body 302 can be made with the combination of plastics, metal, similar material or this type of material.This main body 302 comprises loud speaker 304, dtmf tone accent maker 306, switching circuit 308 and accumulator system 310.Accumulator system 310 is configured to store the identification data that those allow user's telephone calling.As mentioned above, this identification data can comprise number of the account, PIN or these two.This identification data can also comprise the telephone number at call treatment center.In certain embodiments, accumulator system 310 comprises nonvolatile memory system, for example programmable read-only memory (prom), erasable PROM (EPROM), electrically-erasable PROM (EEPROM), FLASH memory or the like.In certain embodiments, accumulator system 310 can comprise detachable member, for example detachable FLASH storage card.
In alternative of the present invention, safety call card 114 also comprises password generator 316 (OTP maker).This password generator 316 transfers maker 306 to link to each other with any necessary mode well known by persons skilled in the art and dtmf tone, so that be achieved as follows described Expected Results.In one embodiment, password generator 316 is connected switching circuit 308 and dtmf tone is transferred between the maker 306, so that produce disposal password in the each activate switching circuit 308 of user.Wherein for instance, described disposal password is a transmission value that can not reverse, and what its was represented is to transfer at the dtmf tone that activates the dtmf tone timings by switching circuit 308.As an alternative, password generator 316 also can be connected between switching circuit 308 and the accumulator system 310, thus disposal password is kept in the accumulator system 310 temporarily, so that instant playback or confirm by for example call processing device 106 or similar communication system element.By this feature, the identification data that is kept in the accumulator system 310 will encoded in the activate switching circuit 308 each time by different way.Do the fail safe of further having guaranteed identification data like this, and reduced the possibility of swindle.For " understanding " described disposal password and corresponding tone sign be correct system user, call processing device 106 or other similar communication system elements will have been tried out irreversible security protocol or handle work according to certain.In one embodiment of the invention, disposal password is based on the disposal password (HOTP) of HMAC, and wherein this technology can be understood from IETF RFC 4226 and describe in the document, and the document then here all is incorporated herein by reference.Other agreements well known by persons skilled in the art are feasible equally, the S/Key that these agreements are described in the IETF1760.Should be noted that in the embodiment that Fig. 3 describes, it is the hardware module that links to each other with other modules of safety call card 114 that password generator 316 is expressed as.As an alternative, it is software module that password generator 316 is expressed as, and wherein this module has comprised necessary code or computer language instruction, provides disposal password needed security protocol so that carry out.For example, password generator 316 can be a part of being transferred the accumulator system 310 of maker 306 visits when activating safety call card 114 by dtmf tone.
In certain embodiments, main body 202 also comprises communication interface (I/F) 312.Communication interface 312 is connected with accumulator system 310.This communication interface 312 can be used for code information accumulator system 310, or upgrades the identification data that is kept in the accumulator system 310.Communication interface 312 can comprise any telecommunication circuit as known in the art, comprising any wireline interface (for example USB (USB)), wave point or the like.
For the sake of clarity, as illustration, it is independent functional part that loud speaker 304, dtmf tone transfer maker 306, switching circuit 308, accumulator system 310 and communication interface 312 all to be shown as.It will be understood by those skilled in the art that one or more in these parts can be used as individual equipment, for example integrated circuit (IC) makes up and implement.Under any circumstance, the electronic component on the safety call card 114 all is connected to the power supply 314 in the main body 302.Power supply 314 can comprise the power supply of any kind as known in the art, comprises battery, solar cell or the like.
Fig. 4 is a block diagram of describing another illustrative embodiments of the communication system 400 of one or more aspects according to the present invention.What communication system 400 showed is the more specific embodiment of Fig. 1 communication system 100.This communication system 400 comprises circuit-switched network 402, one or more packet network 404 and circuit-switched network 406.Circuit-switched network 402 and 406 can be the part of consolidated network, and is commonly called PSTN (PSTN).As well known in the art, PSTN comprises local call operator (LEC) and interexchange carrier (IXC).Packet network 404 can comprise by the Internet Protocol of the various interconnection of various physical operation (IP) network.At least a portion of this packet network 404 can be called as the internet usually.
In this example, first phone 408 is connected with circuit-switched network 402, and second phone 410 is connected with circuit-switched network 406.Phone 408 and 410 comprises the black phone that is connected with PSTN, and can be called as pstn telephone.Packet network 404 also is used to transmit call, and these services are commonly called internet protocol voice (VoIP).Give an example, voip technology allows the user to come telephone calling by internet rather than use PSTN.In this example, the 3rd phone 312 is connected with a terminal adapter (ta) 414, and this adapter transfers to be connected with packet network 404.One of function of TA 414 is to convert voice signal to digital data packets, so that transmit on packet network 404, some phone has built-in terminal adapter, and is commonly called IP phone.
In addition, in this example, personal computer (PC) 416 is connected with router four 19,19 of this router fours then be connected to packet network 404.Because PC comprised microphone and loud speaker usually, therefore, PC 416 uses (for example using " soft phone " to use) as phone equally, works in the mode similar to phone 412 and TA 414 thus.PC 416 carries out the function of TA, so that voice signal is converted to the digital data signal of transmission on packet network 404.Though that here show for example is phone and PC, it will be understood by those skilled in the art that the equipment of other types also can be used for implementing voip phone, for example notebook, PDA(Personal Digital Assistant) or the like.
In some example, the pstn telephone user can call out the voip phone user, for example between the phone of first phone 408 and the 3rd phone 412 (PSTN-VoIP call-flow).In this case, the user of first phone 408 dials the user's who is assigned to the 3rd phone 412 number.It is the number that is associated with the VoIP service supplier that circuit-switched network 402 is identified as this telephone number, and this calling is sent to inbound point (POP) or the regional data center (RDC) (" inbound POP/RDC 418 ") of existing.This inbound POP/RDC 418 provides an interface between circuit-switched network 402 and packet network 404.Inbound POP/RDC 418 will call out the call treatment center 420 that offers the VoIP service supplier via packet network 404.Call treatment center 420 obtains the IP address of the TA 414 that is associated with phone.Then, call treatment center 420 is announced incoming call to TA 414 with signal.Between inbound PIO/RDC 414 and the call treatment center 420 and the signaling between call treatment center 420 and the TA 414 can use various signaling protocols to carry out, session initiation protocol (SIP) or the like for example.If answering call on the 3rd phone 412 is then set up a voice flow by packet network 404 between TA 414 and inbound POP/RDC 418, for example real-time transport protocol (rtp) flows or the like.Inbound POP/RDC418 will be transformed into first phone 408 via the voice flow of circuit-switched network 402 transmission.Calling out end, inbound POP/RDC418 and TA 414 usefulness signals inform that to call treatment center 420 calling finishes.Thus, appropriate charge information can be determined in call treatment center 420.Above-mentioned call flow only is exemplary, for the sake of clarity, has omitted associated various details here.
In other cases, the customer call of voip phone be the pstn telephone user, for example calling (VoIP-PSTN call flow) between the 3rd phone 412 and second phone 410.In this case, the user of the 3rd phone 412 dials the user's telephone number that is assigned to second phone 410.It is the pstn telephone number of standard that call treatment center 420 is identified as this telephone number, and will call out via packet network 404 and offer departures POP or RDC (" departures POP/RDC 422 ").Departures POP/RDC 412 provide an interface between packet network 404 and circuit-switched network 406.These departures POP/RDC 422 becomes the Time Division Multiplexing form with the IP data transaction, and described form then is switched to circuit-switched network 406.Then, circuit-switched network 406 is announced incoming call to second phone 410 with signal in a usual manner.Between departures POP/RDC 422 and the call treatment center 420 and the signaling between call treatment center 420 and the TA 414 can carry out SIP or the like for example with various signaling protocols.If answering call on second phone 410 is then set up voice flow, for example a rtp streaming or the like via packet network 404 between TA 414 and departures POP/RDC 422.Calling out end, departures POP/RDC 422 and TA 414 usefulness signals inform that to call treatment center 420 this calling finishes.Thus, appropriate accounting information can be determined in call treatment center 420.Above-mentioned call flow only is exemplary, and for the sake of clarity, has omitted associated various details here.
In above-mentioned call flows, one of them user has subscribed voip technology (for example user of the 3rd phone 412).Concerning the user who does not subscribe voip technology, this user is not given the option that voip technology is adopted in the calling of initiating to other non-subscribing user in advance.For example, the calling between phone 402 and the phone 410 normally only uses PSTN (circuit-switched network 404 and 406) to assist to finish.In certain embodiments of the present invention, even the user is not the subscriber of voip technology and the other technologies subscriber who is calling out non-voip technology (for example calling between the pstn telephone), the pstn telephone user also can use the VOIP technology selectively.This processing can call card 114 safe in utilization be finished.
Fig. 5 describes the flow chart of illustrative embodiments that the method 500 of call is handled in according to the present invention one or more aspects.This method 500 can be understood with reference to the communication system 400 of figure 4.Especially, pstn telephone (for example phone 402) user obtains the safety call card 113 that the VoIP service supplier provides.Suppose to provide the VoIP service supplier of safety call card 114 also to operate inbound and departures POP/ RDC 418 and 422, and call treatment center 420.Call treatment center 420 is connected with PSTN (for example circuit-switched network 404 and/or circuit-switched network 406).Thus, in certain embodiments, call treatment center 420 provides the function similar with POP/RDC, just docks between packet network 404 and PSTN.
Method 500 starts from step 502, and wherein the user produces the dtmf tone accent by activating safety call card 114, transfers so that pstn telephone (for example phone 402) captures this dtmf tone.What in certain embodiments, dtmf tone was transferred transmission is the telephone number (for example free call numbers that are associated with a certain class call card) of call processing device 420.In other embodiments, before the dtmf tone accent was played to phone 402, the user is the telephone number of place calls processor 420 at first.Any situation no matter, dtmf tone is transferred all also to have transmitted and is allowed user's call card 114 safe in utilization to come the identification data of telephone calling, for example number of the account, PIN or these two.In one embodiment, the dtmf tone accent can repeat when activating safety call card 114 each time.As an alternative, it is to produce at random when activating safety call card 114 each time that dtmf tone is transferred, and can prevent further swindle thus.
In step 504, call treatment center 420 receives and handles dtmf tone and transfers, so that the checking identification data.In step 506, will determine wherein whether identification data is effective.For example, determined can be number of the account whether effectively and exist, whether whether whether the PIN number that is associated with account effective, account can be used to make a call (for example have on the account pre-payment minute) or the like.If identification data is effective, method 500 proceeds to step 508 so.Otherwise this method 500 proceeds to step 507, wherein will refusing user's call card 114 safe in utilization.
In step 508, call treatment center 420 prompting users import telephone number, and wherein for instance, this telephone number can be the telephone number of pstn telephone (for example second phone 410).In step 510, call treatment center 420 receives from user's telephone number (for example the user imports telephone number in response to this prompting and use phone 402).In step 512, call treatment center 420 is used packet network will call out from phone 402 and is routed to called phone.420 receptions of call treatment center and packetizing are from the voice signal of phone 402, so that transmit on packet network 404.If called phone is voip phone (for example the 3rd phone 412), call treatment center 420 can be routed to TA 414 with described calling by packet network 404 in the mode of as above describing in the PSTN-VoIP call flow so.If called phone is pstn telephone (for example phone 410), call treatment center 420 can will be called out by packet network 404 in the mode of as above describing in the VoIP-PSTN call flow and is routed to POP/RDC (POP/RDC 422 for example sets off) so.So, the calling between two pstn telephones can call card 114 safe in utilization and voip technology assist to finish.
Though described different embodiment hereinbefore, should be appreciated that these embodiment only provide as illustration, rather than in order to limit.Thus, the range of preferred embodiment and scope should not be subjected to the restriction of above-mentioned illustrative embodiments, but only define according to follow-up claim and equivalent thereof.
Claims (20)
1. call card apparatus comprises:
Plane card main body, installed on it:
Accumulator system, it is configured to store the identification data that those allow user's telephone calling;
The Dual Tone Multifrequency maker that is connected with accumulator system, it is configured to produce dtmf tone transfers, so that transmit identification data; And
With the loud speaker that the DTMF maker is connected, be used to send dtmf tone and transfer.
2. the equipment of claim 1 also comprises: the password generator that is connected with the DTMF maker.
3. the equipment of claim 1, wherein identification data comprises in following at least one: account identification symbol or personal identification number (PIN).
4. the equipment of claim 3, wherein identification data also comprises the telephone number of call treatment service.
5. the equipment of claim 4, wherein the call treatment service comprises internet protocol voice (VoIP) service supplier.
6. the equipment of claim 1, its midplane card main body also comprises:
With the switching circuit that the DTMF maker is connected, it is configured to control the DTMF maker, transfers so that produce dtmf tone.
7. the equipment of claim 1, its midplane card main body also comprises:
The communication interface that is connected with accumulator system, it is configured to receive the renewal of identification data or identification data, so that it is kept in the accumulator system.
8. method that is used to handle call comprises:
The Dual Tone Multifrequency tone that DTMF maker from the first end points receipt of call card produces, what wherein this dtmf tone was transferred transmission is the identification data that is associated with the user;
Verify this identification data;
Obtain telephone number there from the user about calling out; And
This calling is routed to second end points that is associated with telephone number from first end points.
9. the method for claim 8, wherein identification data comprises in following at least one: account identification symbol or personal identification number (PIN).
10. the method for claim 8, wherein to transfer be that call treatment center internet protocol voice (VoIP) service supplier receives to dtmf tone.
11. the method for claim 10, wherein each in first and second end points all is connected to PSTN (PSTN), and wherein calls out via the packet network route.
12. the method for claim 10, wherein one of first and second end points are connected with PSTN (PSTN), and in first and second end points another be connected with packet network, wherein call out via the packet network route.
13. the method for claim 10, the dtmf tone accent that wherein receives can randomization when transmitting identification data each time.
14. a communication system comprises:
First end points;
Second end points;
Call card, it is configured to produce the Dual Tone Multifrequency tone, and the dtmf tone accent is played to first end points, and wherein this dtmf tone is transferred and is transmitted the identification data that is associated with the user;
The call treatment center, it is configured to verify identification data, obtains the telephone number that is associated with second end points there from the user, and will call out from first end points and be routed to second end points.
15. the system of claim 14, wherein each in first end points and second end points all is connected to PSTN (PSTN).
16. the system of claim 14, wherein one of first and second end points are connected with PSTN (PSTN), and in first and second end points another is connected with packet network.
17. the system of claim 13, wherein call card comprises:
Plane card main body, installed on it:
Accumulator system, it is configured to store the identification data that those allow user's telephone calling;
The Dual Tone Multifrequency maker that is connected with accumulator system, it is configured to produce dtmf tone transfers, so that transmit identification data; And
With the loud speaker that the DTMF maker is connected, be used to send dtmf tone and transfer.
18. the system of claim 17, wherein call card also comprises: the password generator that is connected with the DTMF maker.
19. the system of claim 17, its midplane card main body also comprises:
With the switching circuit that the DTMF maker is connected, it is configured to control the DTMF maker, transfers so that produce dtmf tone.
20. the system of claim 3, wherein identification data comprises in following at least one: account identification symbol or personal identification number (PIN).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US81740906P | 2006-06-30 | 2006-06-30 | |
| US60/817,409 | 2006-06-30 | ||
| US11/770,992 | 2007-06-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101485183A true CN101485183A (en) | 2009-07-15 |
Family
ID=40880999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007800248096A Pending CN101485183A (en) | 2006-06-30 | 2007-06-29 | Method and apparatus for providing and using a telephone calling card |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101485183A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102138314A (en) * | 2009-09-11 | 2011-07-27 | 阿尔卡特朗讯 | Method and system for transferring data related to a calling card function via a packet switched link |
-
2007
- 2007-06-29 CN CNA2007800248096A patent/CN101485183A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102138314A (en) * | 2009-09-11 | 2011-07-27 | 阿尔卡特朗讯 | Method and system for transferring data related to a calling card function via a packet switched link |
| CN102138314B (en) * | 2009-09-11 | 2017-03-08 | 阿尔卡特朗讯 | Method and system via the packet switched link transmission data relevant with call card function |
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Open date: 20090715 |