GB2336505A - Call screening using access code - Google Patents

Call screening using access code Download PDF

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Publication number
GB2336505A
GB2336505A GB9908549A GB9908549A GB2336505A GB 2336505 A GB2336505 A GB 2336505A GB 9908549 A GB9908549 A GB 9908549A GB 9908549 A GB9908549 A GB 9908549A GB 2336505 A GB2336505 A GB 2336505A
Authority
GB
United Kingdom
Prior art keywords
signal
telephone
access
code
filtering
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9908549A
Other versions
GB9908549D0 (en
Inventor
Leonard George Maxwell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Status Hi Tech Ltd
Original Assignee
Status Hi Tech Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Status Hi Tech Ltd filed Critical Status Hi Tech Ltd
Publication of GB9908549D0 publication Critical patent/GB9908549D0/en
Publication of GB2336505A publication Critical patent/GB2336505A/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/32005—Automation of particular receiver jobs, e.g. rejecting unwanted calls
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/663—Preventing unauthorised calls to a telephone set
    • H04M1/665—Preventing unauthorised calls to a telephone set by checking the validity of a code
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/57—Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N1/32106—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title separate from the image data, e.g. in a different computer file
    • H04N1/32122—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title separate from the image data, e.g. in a different computer file in a separate device, e.g. in a memory or on a display separate from image data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N2201/3201—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N2201/3271—Printing or stamping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N2201/3201—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N2201/3273—Display

Abstract

A telephone signal filtering apparatus 10 comprises an input port 22 for receiving a telephone line 12 and an output port 24 for receiving a telephone cable 26. The apparatus further includes a microprocessor which receives incoming telephone signals. The received telephone signal is intercepted, a message is transmitted to the calling telephone requesting entry of an access code and the code is verified by the microprocessor. If a correct code is entered then the signal is allowed to pass to the telephone to allow the telephone to ring. If the access code is not entered correctly then the telephone line is disconnected. The apparatus may be powered from the telephone line, may include a caller line identification display 30 and may also be used to prevent unwanted fax messages, in which case the operator of the calling fax machine is alerted to need for a password either via the fax machine's display or via a message which is printed by the calling machine.

Description

1 T.kI&PgqNE!, GWL FILZ9RINP APP&UTI1C 2336505 The invenzion relates to a
telephone signal filtering apparalCus for installaticn on a telecommunications apparatus.
People filter telephone calls in a number of ways. For example, people will often leave an answer phone switched on even though they are present so that the person leaving the message can be dentif ied and the phone can be picked up to speak direct to +he caller should tIne need arise. Also., call waiting systems are known and are used where the destination telephone is busy- In that case, a message is provided to the caller to let them know that they have entered the call waiting system and that their enquiry be dealt with promptly. If the caller is prepared to wait, their call will eventually be answered.
It is an object of the present invention to provide an improved telephone signal filtering apparatus.
According to one aspect of the -invention there is provided a -elGphone signal filtering apparatus for installation on a t. e lecommun-icat ions apparatus, upstreamof the telecommunications apparatus, the telephone signal filtering apparatus comprising signal receiving means arranged to intercept an incoming signal, means for requestIng an access authorisation signal from the signal sgnde4-, verification means whic'.'i checks the access authorisation s"lgnal and which, on receipt of a valid acress 2 authorisation signal, allows telecommunications apparatus.
x 1 1 1 zhe sig-nal to pass to the AcrnrclJLr,gly, the present system provides an access code to enable friendly calls to reacill rhe telephone or telefax. Any calls which arc not deemed "frienclly" car, be disconnected. 'The present Aystem is advantageous over the prior monitoring methods since in the prior systems the destination telephone would ring or the doz.-naL-Z'-l'on fax woul--! ccrinect beforp the call filter-ing was activated. In the present system z.qe recelving means irritercepts O'le signal prior to it reaching the telephore or facs-i;-miie machine and rpauests t h. e authorisation signal. f no L L. authorisation signal is received or an incorrect authorisation s:.gr.al is received then the call is not massed to the telephone or farsimile. In other words, the telephone does not ring or the.fax does not, connect until the caller has entered the correct security signal.
Accarding to another aspect of the invention, there is provided a telephonq signal filtering apparatus for installation on a t e lecon, municat ions apparatus, upstream of the telecommunications apparatus, the telephone signal filtering- apparatus comprising: signal receiving means arranged to intercept an incoming signal, mean.s for requesting an access authorisation signal from the zianal sender.. verification means which checks the access authorisation signal and which, on receipt of a vdlid access authorization signal allowc, the signal to pass to thp 3 telecommunications apparatus, in which the telephone signal filtering apparatus is provided within a telephone exchange.
In that way, it is unnecessary for a user to buy hardware if, for example the service is only required in the short-t-erm or occasionally The system is intended to eliminate nuisance calls, such as cold calls from companies selling their products by telephone and offensive telephone calls.
The telecommunications apparatus could be any one of a terrestrial tR]ephone, a facsimile or a mobile phone.
-Lhe access authorisation signal is preferably a code, most preferably a numerical code. The code is preferably entered into the key pad of the calling telecommunications apparatus. The code is preferably between 4 and 6 digits in length.
The verification means preferably comprises a microprocessor which receives the incoming signal, generates the access authorisation signal request, receives any access authorisation signal and verifies the signal and then determines whether the signal should be allowed to pass to the telecommunications apparatus.
The means for requesting an access authorisation signal from the signal sender is preferably a gpoken reiuest which is stored in 4 permanent memory of the microprocessor. The apparatus may be pre- programmed with an access authorisation signal request and/or the apparatus is arranged to record the users personal access authorisation signal request. Where the zelecommunicat ions apparatus is a facsimile machine the access authorisation signal request may be transmitted to the facsimile machine which is sending the signal and the sending facsimile machine may either display the message on its display or may print the message as a facsimile message.
The verifica&--,ion means preferably includes a clock, which allows a predetermined period of time to expire in which the sender can enter th. cir access authorisation signal. If no signal is re-Ceived in that time then the apparatus may disconnect the line.
The verification means may include a message which indicates that the access autliorisatJon signal provided is invalid and allow the sign.al sender a further opportunity to enter a valid access authorisation signal. The verification means preferably allows between one arid three attempts at entering a valid access authorisation signa3 before it disconnects the line.
The apparatus preferably comprises a housing, an input lead for connection to a telecommunications socket, an output port for receiving the input lead of a telecommunications apparatus, such as a telephone, the input lead and the output port comprising conventinnal telecommunication connections. The apparatus may jinclude a display which indicates whether filtering is activated.
The apparatus may include a caller display facility to display the number of the telephone calling into the line.
The apparatus is preferably operable by means ef a key pad on the telecommunications apparatus with whicl.h it is associated.
The apparatus may include means to prevent unauLhorised use of the telecommunications apparatus with which it is associated. In other words, where the apparatus is associated With the zelephone, the apparatus may requesc an outgoing call authorisation signal ro be input by the user before access to the telephone network is allowed.
in a further embodiment, the apparatuz may be arranged to prevent all incoming calls from passiJng to the telecommunications apparlklus. In such a case, the apparatus includes means for providing a message to the signal sender recardincl non-accepzance of ',,--tie signal and means to disconnect the 141.ne after transmission of the message.
in another aspect of the invention Ciere is provided a telephone signal filtering apparatus associated with a telecommunications apparatus upstrearr, of the telecommunications apparatus, the telephone signal filtering apparatus comprising signal receiving means arranged to intercept an incoming signal, means for providing a me-ssage to the signal sender regarding non-acceptance of the signal and means ro disconnect the line after transmission ot the message. In that way, all calls can be intercepted by the 6 apparatus and the telephone will not ring or facsimiles will not be received.
in a preferred embodiment c-11 either aspect the apparatus may draw power from the telephone line. Alternatively, a separate power supply Tray be provided tor the apparatus.
Embodiments of the invertion will now he described in detail by way ef example and with reference to the accompanying drawings in which:- I 1 is P- schematic diagram of a f;i:sL call filtering apparatus in, accordance with the invention, Fig. 2 is a schematic diagrarr, of a second call filtering apparatus in accordance with the invention, Fig. 13) ig a block diagram showing the operation of the apparatus of Fig. 1 and Fig. 4 -is; a schemat-ic re-procentation of the microprocessor in the apparatus Fig. 1, Frig. 5 is a schematic diagrain of a fuither call filtering apparatus in accordance with the invention constituted by software w,-,tliin a telephone exchange.
In Fig. 'L a telephone signal filtering apparatus 10 is arranged on a telephone line 12 between a mains Sockez 14 and a telephone 16. The apparatus 10 is powered by means of a mains adaptor 13 connected to the mains electricity supply 20. The apparatus 1.0 ncludes an input. port 22 for receiving the Lelephone line 12 7 from the mains socket 14 and an output port 24 for receiving the telephone cable 26 from the telephone 16.
The apparatus 10 further includes a microprocessor 26 which receives the signals from the line 12 and passes them to th-e telephone 16. The apparatus also includes a liquid crystal display 30 fror displaying messages to the user.
The microprocessor 28 is shown schematicallY in Fig. 4. The m.,J. croprocessor 28 includes a siqnal intercept area 32, a message transmission area 34, a code verification area 36, a signal +Cransmission area 38, a line disconnect area 40 and a control area 42.
In use, an incoming signal 5 passes via telephone line 12 and input port 22 and is intercepted in signal intercept area 32.
On a signal S, the message transmission area 34 is activated and a message M is transmitted back along linc 12 t-o the caller. The message requires the caller to ---nter an access code or signal. In the present case the access code is a fou- digit code which can be entered via the key pad of a touch tone telephone. The caller then enters his access code C and the code C is passed Lo the code verification area 35. if the code C is correct, the verification area 36 allows t',-.e signal S to be passed to the signal transmission area 38 whereupon the signal passes via output port 24 to the telephone 16. If the code is incorrect then a further message is sent back along the line requesting that the caller attempts to enter a correcl code and a the code verification area checks subsequently entered codes. If a correct access code is not entered after a pre-cleterm,ned peried. of time or after a pre-dete::Tnined number of attempts, then thle line disconnect area 40 is activated and a disconnect signal,s serL back alona line 12 to disconnect the line. Preferably, a message indicating that an incorrect code has been entered is forwarded along the line prior to disconnection. The control area 42 operates the microprocessor and stores data such a5 the correct access code and the audio messages M. The flow chart of Fig. 3 illustrates the operatJon of the apparatus in detail.
In the apparatus of Pigs. 1, 3 and 4, the telephone signal filtering apparatus can be activated by means of tbe telephone 1C. That can be done by, for e>cample.. lifting the tGlaphor.e receiver, pressing the """' key, followed by the key. The d--'.splay 30 then indicates that the unit is operative. The same method can be employed to de-activate the apparatus 10. The -L-eJ".ep'nnn,p can also be used to re-proqrarime the microprocessor 28.
For example, pressing "C Lhen "2" could allow all incoming calls to be stopped with a message being re-transmitted indicating Ithatt no calls are being accepted at that time. Pressing "#" then "3" c;ail al'-,ow user to change the access code via the telephone key pad and pressing then "C ran allow the user to record different messages. Other variables which may be programmable or fixed include the number of retrys allowed and the time out perind after which a line will be disconnected. Also, it 1S envisaged that the system will also allow outgoing calls to be ragtrictod, either by storpin-;;11 nutgoina calls or by reQuiring 9 an access code to be inserted on the telephone key pad before connection to thp ma-in. telephone line is allowed.
eoreover, it. is envisaged that other tele communicat ions functions could be incorporated into rhe apparatus 10. For examz)le, th.e apparatus could include "Caller clisplay", in other worcls, the telephone number or, whare stored, the name of the caller could be displayed on the display 30 when a signal. S _js received.
The apparatus 44 shown In Fig. 2 is an apparatus in accordance wit-li the second aspect of the inventicr.. in other words, the apparatus 4-4 merely acts as a call stopping devicc. In that case, incoming signals 5 receive a message from the apparatus 44 indicating that no callc- are being accepted on rnat line and the line is thon disconnected. The telephone 16 is not allowed to -ri.ng. ".'hat apparatus 44 draws its powor from the telephone power Supply. The device merely includes an LED 46 on its houcing indicating, when lit, that the apparatus 44 is activated. Alternatively, the unit 41 could act as a call Ifiltering apparatus similar to that described in Figs. 1, 3 and 4.
in Fig. 5, a further call filtering apparatus 50 comprises signal filterina software 51. for use in a telecommunicat ions exchange R. The software 51 comprises instructions that initiate functions in tho to le con, minicat ions exchange E equal to those that the microprocessor 28 performs. The software 51, therefore, compr-1ses instiuctions that initiate signal intercept, message transmission, code verification, signal transmission, i in e aisconnectIon and control. The software 51, in use, is installed in the telecorpmunicatior-s c-,tchange, 2 and may be r-,in cont,,nuously or upon activation by the subscriber.
The advantage of the present system over prior deviceR used to monitor and filter calls is that the telephone 16 is not allowed to ring unless a correct access code is entered. Accordingly, unly friendly calls can be received and nuisance calls, such as cold sales calls, pranksters and ottensive callers carinot get thrOugh.
I 1

Claims (24)

  1. A telephone signal filtering apparatus for installation on a relecommunications apparatus, upstream of the telecommunications apparatus, the telephone signal filtering apparatus comprising signal receivng means arranged to intercept an incoming signal, means for requesting an access authorlsation signal fror. the signal sender, verification means which checks the access authorisation signal and which, on receipt of a valid access authorisation s-ignal, allows the signal to pass zo the telecommunications apparatus.
  2. 2. A telephone signal filteri,,it-, apparaLus for installation. on a telecommunications apparatus, upstream of the --e-lecor,tmunicatJ,.ons apparatus, the telephone si"'-gnal f-,1'-.erLng apparatus comprising sLgnal receiving means arranged to intercept an incoming c;i:cna,, means for requesting an access authorisation signal from signal sender, verifi.at-Jon means which checKs the access aut-',,.ori--a--ion signal and which, on receipt of a valid access authorisation signal, allows the signal to pass tc the tel ecommun izat ions apparatus, in which r-he telephone signal f.-'.lzerinG apparatus is provided within a telephone exchange.
  3. 3, i A telephone signal filtering apparatus according to claim or 2, in which the telecommunications apparatus is a te.rrestrial relephone, a facsimile machine cr a mobile phone.
  4. 4. A telephone signal f ilterIng apparatus according to any preceding clain, in which the access authorisation signal is a 12 code.
  5. 5. A telephone signal filtering apparatus according to claim 4, in which the code is a numerical code.
  6. 6. A telephone signal f iltering apparatus according to claim 4 or 5, in which the code is entered into a calling telecommunication apparatus.
  7. I- g no claim j A telephone signal filtering apparatus accordir 6, in w9.Iiich the code is entered using a keypad.
  8. 8. A telephone signal filtering apparatus according to claim 4, 5, 6 or 7, in which the code is between 4 and 6 digits in length.
  9. 91 A tei-epho,.ic signal filtering apparatus according to any preceding claim, in which the verification means comprises d microprocessor which receives the incoming signal, generates the access authorisation signal request.. receives an access authorigatio.-. signal and verifies the signal and then determines wInether or not Cae signal should be allowed to pass to the receiving telecommunications apparatus.
  10. 10. A telephone signal filtering apparatus according to any preceding claim, in which the means for requesting an access authorisation signal from the signal sender is preferably a spoken request.
  11. 13 !I. A telephone signal filtering apparatus according to claim 10, in which the request is stored ir the memory of the microprocessor.
  12. J. 2. A telephone signal filtering apparatus according to any preceding claim, in wInich the appardtus is pre-p-rogrammed with an access authorisation signal request and/or the apparatus is arranged to record the personal access author isat _Jon signal request of the user.
  13. 13. A telephone signal filrering apparatus according to claim 3 3, where the te leer,,-nmunicat ions apparatus is a facsimile machine, in which the access autho--isation signal. request is transmitted Lc the facsimile machine whIch is sending the signal and the sending facsimile machin.e either displays or prints the message.
  14. 14. A telephone signal f iltering apparatus according Lo any preceding claim, ir. which the verification means includes a clock which allows a predetermined period of t,.me to expire in which t'.,ie sender can enter their access autho--isation signal ancl disconnecting means to disconnect the call if the access auLhor-isation signal _Js not properly entered in due rIme.
  15. 15. A telephone signal filtering apparatus according to any preceding claim, in which the verification means includes massaging means which indicates that the access authorisation signal provided is invalid and allows the signal sender at least k.' -er a valid access authorization one further opportunity to ent i 4 signal.
  16. 16. A telephone signal f&4.-'zer-Jng apparatus according to claim 15 in which the verif -4cation means allows between on.e and three attempts at entering a valid access authorization signal.
  17. 17. A telephone signal filtering apiparatus according to claim 1 or any one of claims 316 when dependent upon claim 1, in which the apparatus comprises a housing, an input lead for connection tc a t ele,ommunicat ions socket, an output port for -receiving the nPut lead of a telecommunications apparatus such as a telephone, the:Lnput load and the output port comprising conventional telelcommunications connections.
  18. 18. A telephone signal filtering apparatus according to claim 1 or any one of claims 3-17 when dependent upon claim 1, in which Lhe apparatus includes a display which indicates whether filtering is activated or not.
  19. 19. A telephone slg--al filtering apparatus accordincl to clal.m 1 or any one of claims 3-18 when dependent upon claim 1, in which the apparatus includes a caller display facility to display the number of the teler)hone calling into the line.
  20. 20. A telephone signal filtering apparatus acco-rding to claim 1 or Anyone of claims 3-19 when dependent upon ciaim 1, in which the apparatus is operable by means of a key pad on the associated telecommunications apparatus.
    is
  21. 21. A teIGphone signal filtering apparar-us according to any Preceding claim, in whicP the dpparatus requests an outgoing ca13 auz.icr-sar-ion signal to be -ini-:ut by the user before access to the telephone network is granted.
  22. 22. A telephone signal filtering apparatus according to any P.-eced-r.a claim, in which the appararus is arranged to prevent aj.1 incoming calls from passing to the te le communicat ions apparatus.
  23. 23. A telephone signal filtering apparatus associated with a telecommunications apparatus upstream of the telecommunications apparatus, the telephone s-'.gnal filtering apparatus comprising sianal receJ-v-Jng means arranged to intercept an incoming signal, means for provding a message to the signal sender regarding non accePtance of the signal and means to disconnect the line after transmission of thq messa,:1e.
  24. 24. A telephone signal --^iltering apparatus according to _any preceding cla.;-m, in which the apparatUS draws power. from the telephone Iine.
GB9908549A 1998-04-14 1999-04-14 Call screening using access code Withdrawn GB2336505A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB9807642.5A GB9807642D0 (en) 1998-04-14 1998-04-14 Telephone signal filtering apparatus

Publications (2)

Publication Number Publication Date
GB9908549D0 GB9908549D0 (en) 1999-06-09
GB2336505A true GB2336505A (en) 1999-10-20

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GBGB9807642.5A Ceased GB9807642D0 (en) 1998-04-14 1998-04-14 Telephone signal filtering apparatus
GB9908549A Withdrawn GB2336505A (en) 1998-04-14 1999-04-14 Call screening using access code

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Application Number Title Priority Date Filing Date
GBGB9807642.5A Ceased GB9807642D0 (en) 1998-04-14 1998-04-14 Telephone signal filtering apparatus

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2443871A (en) * 2006-07-25 2008-05-21 Nigel Morris Programmable telephone call filtering device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4845743A (en) * 1986-09-12 1989-07-04 Lutz Joseph M System for selectively receiving telephone calls
US4860347A (en) * 1988-08-10 1989-08-22 Costello Lloyd M Phone screen security system
US4937854A (en) * 1989-03-03 1990-06-26 Sarakas Stephen T Call screening device
CA2002842A1 (en) * 1989-11-14 1991-05-14 Victor M. Buraconak Programmable external peripheral device using a 4 digit private identification number, p.i.n.#, to secure and protect and eliminate unsolicited and unwanted document reception, commonly known as "junk fax", applicable to a facsimile machine, commonly known as a fax machine
EP0713315A1 (en) * 1994-05-19 1996-05-22 Aprovisionamiento De Zumos Naturales, S.R.L. Apparatus for controlling the telephone access of in-coming calls
US5631951A (en) * 1996-03-19 1997-05-20 Chen; Albert Apparatus for preventing unwanted telephone calls

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4845743A (en) * 1986-09-12 1989-07-04 Lutz Joseph M System for selectively receiving telephone calls
US4860347A (en) * 1988-08-10 1989-08-22 Costello Lloyd M Phone screen security system
US4937854A (en) * 1989-03-03 1990-06-26 Sarakas Stephen T Call screening device
CA2002842A1 (en) * 1989-11-14 1991-05-14 Victor M. Buraconak Programmable external peripheral device using a 4 digit private identification number, p.i.n.#, to secure and protect and eliminate unsolicited and unwanted document reception, commonly known as "junk fax", applicable to a facsimile machine, commonly known as a fax machine
EP0713315A1 (en) * 1994-05-19 1996-05-22 Aprovisionamiento De Zumos Naturales, S.R.L. Apparatus for controlling the telephone access of in-coming calls
US5631951A (en) * 1996-03-19 1997-05-20 Chen; Albert Apparatus for preventing unwanted telephone calls

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2443871A (en) * 2006-07-25 2008-05-21 Nigel Morris Programmable telephone call filtering device
GB2443871B (en) * 2006-07-25 2010-09-08 Nigel Morris Programmable telephone call filtering system

Also Published As

Publication number Publication date
GB9908549D0 (en) 1999-06-09
GB9807642D0 (en) 1998-06-10

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