CN1243631A - Telephone switching system - Google Patents

Telephone switching system Download PDF

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Publication number
CN1243631A
CN1243631A CN98801848A CN98801848A CN1243631A CN 1243631 A CN1243631 A CN 1243631A CN 98801848 A CN98801848 A CN 98801848A CN 98801848 A CN98801848 A CN 98801848A CN 1243631 A CN1243631 A CN 1243631A
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CN
China
Prior art keywords
subscribers feeder
sound source
calling
user
telephone exchange
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.)
Pending
Application number
CN98801848A
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Chinese (zh)
Inventor
朱塞佩·马尔图奇
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.)
British Telecommunications PLC
Original Assignee
British Telecommunications PLC
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 British Telecommunications PLC filed Critical British Telecommunications PLC
Publication of CN1243631A publication Critical patent/CN1243631A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/42017—Customized ring-back tones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/50—Centralised arrangements for answering calls; Centralised arrangements for recording messages for absent or busy subscribers ; Centralised arrangements for recording messages
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/487—Arrangements for providing information services, e.g. recorded voice services or time announcements
    • H04M3/4872—Non-interactive information services
    • H04M3/4878—Advertisement messages
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/428—Arrangements for placing incoming calls on hold
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/54—Arrangements for diverting calls for one subscriber to another predetermined subscriber

Abstract

A telephone exchange transmits audible signals to a subscriber line to indicate exchange or network conditions. The audible signals to be transmitted to the subscriber line are selected (means 15) from one or more available audible signal sources (14, 16, 17, 18) according to the contents of a store location (20) for that subscriber line. Further store locations (25) are provided for each subscriber line to enable selection (means 21) of further audible signal sources (22, 23, 24) dependent upon the condition. The subscriber may alter the contents of his or her store location (20, 25) by dialling a special code. By dialling a special code the subscriber may initiate a call attempt using a predetermined series of dialled digits corresponding to the selected signal source (16, 17, 18), in response to the information heard.

Description

Telephone exchange
The present invention relates to telephone exchange, relate to more particularly that switch is prepared to send to subscribers feeder, in order to indicating the voice signal of switch or network conditions (for example can dial), or in order to indicate about setting up the voice signal of a process of attempting of wishing to connect.
Propose various usefulness and had the system that the information of advertising signal for example replaces conventional voice signal (" dialing tone ", " the line is busy (doing) sound " etc.).
According to an aspect of the present invention, provide a kind of telephone exchange, it comprises:
(a) can be in response to one or several call proceeding situation of one first subscribers feeder a sound source of selecting from a plurality of sound sources be connected to control device on first subscribers feeder, wherein there is corresponding second subscribers feeder of an associated company at least one tut source;
(b) can start the device that first subscribers feeder pair and the calling of second subscribers feeder of sound source associated are attempted in response to specifying dialing signals from some of first subscribers feeder.
According to another aspect of the present invention, a kind of method of controlling telephone exchange is provided, this method may further comprise the steps: when the call proceeding situation to one first subscribers feeder responds, a voice message of selecting from a plurality of voice messages first subscribers feeder that leads; And when specifying dialing signal, start first subscribers feeder calling with second subscribers feeder of selected voice message associated is attempted in response to one of first subscribers feeder.
The call proceeding situation for example can be " receiver is disembarked ", " the line is busy " or situations such as " it is invalid that institute dials the number ".Telephone exchange can contain a memory, for each subscribers feeder in a plurality of subscribers feeders that are connected on the switch, this memory all has one to be used for storing the memory location that has indicated the code word of a sound source in a plurality of sound sources, control device can come being connected on calling party's line by the specified sound source of code word wherein corresponding to the memory location of calling party's line by inquiry, and telephone exchange can also be provided with such device, this device can change the code word in the respective memory locations in response to the time data in a day, thereby the sound source of attempting to be selected for this user calling thereafter will change thereupon, switch can also set up or replace said apparatus to be provided with such device, this device can change the code word in the respective memory locations in response to institute's stored user information data, thereby the sound source of attempting to be selected for this user calling thereafter will change thereupon.Code word can be in response to from the appointment dialing signal of subscriber's telephone line and change.
To some embodiments of the present invention be described with reference to the accompanying drawings by means of example now, at accompanying drawing,
Fig. 1 shows a digital local switch;
Fig. 2 illustrates the structure of a digital sorter;
Fig. 3 to 7 is respectively the flow chart corresponding to the work of key diagram 2 control units 13 of following each embodiment;
Fig. 3: replace " dialing tone " with the optional sound source of user;
Fig. 4: replace " jingle bell ", " the line is busy " and " invalid number " sound with the optional sound source of user;
Fig. 5: when reservation is dialled the number, broadcast an optional sound bulletin of user;
Fig. 6: when dialling the number, broadcast an optional sound bulletin of user, have other device and can select to be connected additional acoustic information in the initial voice bulletin keeping;
Fig. 7:, broadcast an optional sound bulletin of user keeping when called party's line provides the jingle bell electric current.
Referring to Fig. 1, digital switch 1 shown in it, it has some connecting lines 2 that are connected with other switches and/or telephone network main convertor, also has the connecting line 3 that some are connected with some analog lines 6 by digital sorter 4 (if needs, also can by far-end sorter 5).
Fig. 2 illustrates, and subscribers feeder 6 is connected on some subscribers feeder modules 7 in the digital sorter 4, and each subscribers feeder module 7 all contains jingle bell electric current injector, 2 line to 4 line transducers and modulus and digital to analog converter.Each subscribers feeder module 7 all has digital input and output on the switch that is connected in some digital switchs 8,9.Lead to digital switch 1 from the signal of switch 8 outputs by a tone injection unit 10.On this aspect, also connected the receiver 11 that is used to receive tone (DTMF) signal.Similarly, input signal is from switch 1, and process tone injection circuit 12.Unit 7-12 all is connected on the sorter control unit 13 by the form of the processor of stored program control by one.
When the user takes receiver (" receiver is disembarked "), subscribers feeder module 7 will identify this situation, and the processing of trigger control unit 13, with the connection of guidance by switch 8,9, and distribute some dtmf detectors 11 to survey user " dialing ".Controller 13 indicates this situation that can dial by activating the 15 dialing tone passages to tone injection unit 12 from tone generator 14 to switch to the user.
So far illustrated switch is identical with the response of conventional interchanger to the response that normal dialing is surveyed.
This switch is that with the difference of conventional switch the former might the sound source of advertising signal (16,17,18) substitutes conventional dialing tone with for example providing.
Other sound source can be provided, the intermittently unit 19 of dialing tone for example can be provided, indicate certain particular state of subscribers feeder, for example the transmission of Hu Jiaoing is carried out.
Should be appreciated that all these sound sources all are used to provide as the user and take the sound that receiver just can be heard, the sound that just provides switch just can hear when the receiver escape status is responded.
For the sound source that can select to be heard, sorting module 4 contains a memory 20, wherein each subscribers feeder is all had a storage device, makes control unit 13 to be stored in the sound source that this locational code word is discerned needs connection by inquiry.Should see that the content selectable of being broadcasted is selected to such an extent that be suitable for the user, for example according to the user profile data, may also comprise geodata, selects.Such device can also be set, at any time change his or her selection for the user, its method is (for example to key in a specific code word *1, *2 etc.), this code word will be received by dtmf detector 11 and 13 identifications of Be Controlled unit, and the latter is written to corresponding code word the corresponding position of memory 20 then.When the user takes receiver next time, new code word will occur in the memory 20, thereby the sound source (14,16,17,18) of new selection will be provided.User's selection can cause different rates of charge: for example advertiser can pay that part of charge of being reduced or remitted.
Need particularly point out, the change of code word only is used for selecting desirable dialing tone or other alternative sound in the memory 20, can not influence the service that switch provides to the user in other respects.
To illustrate in greater detail the work of control unit 13 when the user takes receiver in addition again with reference to figure 3 now, suppose that wherein the code word that inputs to memory 20 is a number 14 and 16 to 18 used among Fig. 2.
Subscribers feeder module 7 detected user's " receiver is disembarked " situation and distributed the sorting switch and DTMF equipment after, the calling that will check whether have activated this subscribers feeder transmits.If be judged to be "Yes", then select intermittently dialing tone unit 19, and inject unit 12 by switch 15 and tone sound source is connected on the user.Transmit the wherein specified sound source unit of the then content of user storage position in control unit 13 readout memories 20, and selection if activate to call out.This may be some among normal dialing tone unit 14 or the alternative sound source 16-18.Selected sound source is injected unit 12 by switch 15 and tone and is connected on the user.
That DTMF equipment that is assigned with is monitoring the numeral or the code of any key entry on the subscribers feeder during the broadcasting of sound source.Substitute sound source (among the 16-18) before the dtmf signal and finished and broadcasted if on subscribers feeder, detect, then will select dialing tone unit 14 and broadcast dialing tone.When having selected dialing tone, will carry out " time is intact " timing with commonsense method, up to detecting dtmf signal or timing then on subscribers feeder, for back one situation, control unit 13 will stop this calling to be attempted.
Detect DTMF and just mean that the user has begun to mean perhaps that to called party dialing the user has transferred to particular code, require to change the content at place, memory location or the information that sound source sent made reply.Especially, by transfering to the suggested particular code of sound source information (for example " to request *9 to order ... "), can start calling to a certain selected number.To suspend current when detecting DTMF immediately is broadcasting of selected sound source.
If the user transfer to particular code " *0 ", control unit 13 will be broadcasted one and help bulletin, the corresponding codewords of listing alternative sound source and needing to import. Effective code *1, *2, *3 or *4 input to show new selection, at this moment will be broadcasted the content of user storage position in the updated stored device 20 bulletin and confirm selected sound source.To broadcast the dialing tone of unit 14 then, until the user imports another special code or transfers to a telephone number or timing then.
Import some codes, for example among Fig. 4 " *9 ", the current content of control unit readout memory 20 will be made.If be stored in code word in the memory 20 corresponding to one among the sound source 16-18, then will select and send a corresponding businessman number as one group by calling telephone number, to set up the calling of user to advertiser or other informants.
No matter whether as to the replying of prompting, call out when attempting when making, can be after the number of transfering to the called party rather than before, that is to say alternative as the jingle bell sound, broadcast the optional sound source of another user.
In normal arrangement, the Outgoing Number that is used for setting up a call is sent to called party side by switch 1 and network switch (perhaps, for the situation of called party position in same switch scope, then dialling the number is transmitted to switch 1).When called party's switch has successfully been set up to the connection of called party's line and when it has applied the jingle bell electric current, this switch will return to this situation the switch of calling party, and the control unit 13 among the latter just will inject the jingle bell sound by injecting unit 12.If no matter call failure is because the number of being dialled is invalid or the line is busy owing to called out a side, then will broadcast other message as below illustrating.
Replace as the simplest jingle bell sound, will from other sound source 22 (conventional jingle bell sound), 23 or 24 (message), select a voice signal that shows jingle bell by switch 21 by control unit 13.Selection at that time by be stored in the memory 25 that is similar to memory 20 each user is had that one locational code word is specified (in fact also can be only with a memory; Perhaps depositing the function of paying device 20 and 25 can be realized by some appointed areas in the general-purpose storage of control unit 13 self).
In these cases, the work of control unit 13 is shown in the flow chart of Fig. 4.As seen from Figure 4, for the user provides such chance, promptly, after the telephone number of transfering to the called party, to broadcast which sound source in the sound source 22 to 24 to show hope by the content at the place, memory location that transfers to the code of another group in particular code to change to belong to this user in the memory 25.The help bulletin of being discussed in the time of can further allowing with reference to figure 3 also comprises sound source 22 to 24 in the sound source inventory that can Gong choose, use after feeding to called party's dialing.
The jingle bell sound of above-mentioned plain mode is replaced a shortcoming, promptly the calling party user can only wait for that called party user answers the call during this period of time in hear selected sound.Therefore,, can deliberately postpone the time of finishing calling, call out the message that to hear that hope is heard so that allow if be ready.This can accomplish with two kinds of methods: the perhaps number that (for example in buffer 26) buffer memory is dialled at calling party switch place, call establishment is postponed till on such time point just to be allowed to proceed, called party's switch has confirmed that called party's line has allowed call accepted on this time point, and distant place switch has been broadcasted message waiting for always before being sent the jingle bell electric current by the called telephone line thereafter.
For fear of incuring loss through delay urgent calling, wish that very not only the calling party should be able to eliminate above-mentioned delay, and should not stop the called party before above-mentioned calling party finishes its calling procedure, to listen in the alternative bulletin, can send or receive other calling.
So, according to still another embodiment of the invention, transfer to called party's telephone number as the calling party after, calling procedure is suspended in the switch of calling party, promptly be buffered in the buffer 26 broadcasting the number of transfering in the period of sound source, the work of control unit 13 is shown in Fig. 5 among this embodiment.In this example, according to the content at the place, memory location that belongs to above-mentioned calling party's line in the memory 25, from optional sound source unit 22 or 23 shown in Figure 2, select a sound source.According to Fig. 5, at buffer memory behind the number of transfering to, the content of user storage position in control unit 13 readout memories 25.If it is conventional sound source unit 22 that the content of reading shows selected, then data in buffer will be released immediately to network, and calling procedure is normally carried out, and when called party's line allows receipt of call conventional jingle bell sound be sent to the calling party.To show selected be to substitute sound source unit 23 if read content, and then control unit 13 will inject unit 12 by switch 21 and tone and send the sound bulletin to subscribers feeder.Simultaneously, appointed dtmf detector will be broadcasted numeral or the code that is monitoring any key entry on the subscribers feeder in the process at sound source.If broadcasting before the dtmf signal that detects on the subscribers feeder of sound source unit 23 finishes, then data in buffer will be released to network, and calling procedure is normally carried out.Yet if the user has transferred to a specific code, for example " # " will stop to broadcast of selected bulletin immediately, and the number of being dialled is released to network.
With reference now to Fig. 6, a kind of variant of this embodiment is described, wherein the design of control unit 13 makes the calling party can listen to a bulletin that two parts are arranged, and second portion is selected according to particular code of input.In this example, the sound source unit 24 (advertisement) of Fig. 2 provides two-part bulletin.When broadcasting the first of this bulletin, the dtmf detector of appointment is monitoring any key entry numeral or the code on the subscribers feeder.Transfer to " # " will stop the number that bulletin is broadcasted and handle is transferred to immediately and discharge, call proceeding is normally carried out to network.Otherwise the first of bulletin will point out the user to import a code, for example " *7 ", if he or she wishes to listen to following advertisement.For example, " scholar's expense is willing to distinguish for your this calling payment 5 by Blaw Gus (Bloggs) food company, presses *7 will represent to accept and listen to the details of supply position this week ".If the user press " *7 ", then sound source 24 will be broadcasted advertisement.Broadcast the data that are buffered after the end and will discharge to network, call proceeding is normally carried out.If the user finishes the back without any action broadcasting of bulletin first, data cached will being released after through one section preset time then.The user can stop bulletin and broadcasts by input " # " equally in any stage when needing, but in this example, broadcast if the user stopped it before the bulletin second portion finishes, then control unit 13 will write down this fact, and the calling charge that cancellation is given is reduced or remitted.
In yet another embodiment of the present invention, the number of transfering to is not buffered, and send (far) switch to continue that calling is sent to the called party, but be accompanied by the instruction that also has that number sends switch to, require switch to apply jingle bell electric current (other processing to calling then are normal) for called party's line.In case called party's switch notification call side switch can be proceeded call proceeding, the calling party switch will be in the calling party broadcasts according to memory 25 the selected sound source of content at place, calling party memory location, after broadcasting of bulletin finished or called party when interrupting, the calling party switch will send signal to called party's switch, make it to discharge the jingle bell electric current, apply conventional jingle bell sound (or selected certain other sound) for simultaneously calling party's line.
Referring to Fig. 7, therefrom can see, dial the number sending and receive after the calling that has been ready to receipt of call about called party's line finishes signal to called party's switch, the content that control unit 13 is located calling party memory location in the readout memory 25, and select the sound source unit in view of the above.If what select is general jingle bell sound unit 22, then call proceeding will be proceeded immediately.If what select is to substitute sound source unit 23 or 24, then will be the same with other each embodiment, broadcast bulletin to the calling party.Equally, the calling party also can stop bulletin by input code " # " in any stage that bulletin is broadcasted and broadcast, and continues call proceeding immediately.
Send the calling of calling out or receiving other users for fear of when above-mentioned calling party listens to selected bulletin, hindering the called party, whether control unit 13 will be checked has " the line is busy " signal to return from called party's switch, this signal indicating called party line has been in the receiver escape status to be called out, or has received another incoming call.If received this " the line is busy " signal, then control unit 13 will be provided with a flag to write down called party's line by the line is busy.If broadcast and finish or the called party ends being provided with after " the line is busy " flag bulletin, then will be as conventional situation, to calling party's line transmission busy(-back) tone.If called party's line still can receipt of call (" the line is busy " flag is not set), then broadcast and finish or after the called party ends in bulletin, the calling party switch will send signal to called party's switch, make it to discharge the jingle bell electric current, and continue call proceeding as conventional situation.
Can be generalized to other tone, for example " busy tone " (" busy(-back) tone ") or " not having this number " sound with the notion of the alternative conventional tone of other sound source.Can adopt the method identical, utilize memory location, design control unit 31 to such an extent that also allow to select the alternative sound source of these aspects corresponding to each subscribers feeder with the various embodiments described above.
Shown in Fig. 3 and 4, after the number of transfering to is transmitted to network, if received " the line is busy " or " number is invalid " such inverse signal, then will broadcast a corresponding message (Fig. 4), control unit 13 can be selected this corresponding message by the content (Fig. 3) of readout memory 20.Controller 13 also can design to such an extent that be not to utilize memory 20 as shown in figure, but utilize memory 25 to select, perhaps utilize other memory to select, in this other memory, have the particular message that some are used for substituting " the line is busy " or " number is invalid " sound.

Claims (12)

1, a kind of telephone exchange, it comprises:
(a) can be in response to one or several call proceeding situation of one first subscribers feeder a sound source of selecting from a plurality of sound sources be connected to control device on first subscribers feeder; There is corresponding second subscribers feeder of connection with it at least one tut source;
(b) can start the device that first subscribers feeder pair and the calling of second subscribers feeder of selected sound source associated are attempted in response to specifying dialing signals from some of first subscribers feeder.
2, according to the telephone exchange of claim 1, wherein call proceeding situation comprises one or several situation in the situations such as " receiver is disembarked ", " the line is busy " or " dial the number invalid ".
3, according to the telephone exchange of claim 1 or 2, it contains storage device, this storage device all has one to be used for storing a storage device that can indicate the code word of the some sound sources in a plurality of sound sources for each subscribers feeder in a plurality of subscribers feeders that are connected on this switch, and control device can come being connected on calling party's line by the specified sound source of code word wherein by the storage device of inquiry corresponding to calling party's line.
4, according to the telephone exchange of claim 3, it contains and can ring the time data in a day just and change code word in the corresponding memory location, thereby attempts to change the device of selected sound source for the later calling of this user.
5, according to the telephone exchange of claim 3 or 4, it contains the code word that can change in response to institute's stored user information data in the respective memory locations, thereby attempts to change the device of selected sound source for the later calling of this user.
6, according to the telephone exchange of claim 5, it contains the code word that can change in response to specifying dialing signals from some of subscribers feeder in the respective memory locations, thereby attempts to change the device of selected sound source for the later calling of this user.
7, a kind of method of controlling telephone exchange, it may further comprise the steps: in response to call proceeding situation of one first subscribers feeder the time voice message of selecting from a plurality of voice messages is sent to first subscribers feeder; And, a calling with second user of selected voice message associated is attempted starting first subscribers feeder when specifying dialing signal from one of first subscribers feeder.
8, according to the method for claim 7, wherein call proceeding situation comprises one or several situation in the situations such as " receiver is disembarked ", " the line is busy " or " dial the number invalid ".
9, according to the method for claim 7 or 8, wherein voice message is selected according to first subscribers feeder self.
10, according to claim 7,8 or 9 method, wherein voice message is to select according to the time data in a day.
11, according to the method for claim 9, it also comprises following steps: obtain a code word from a memory location in response to the call proceeding situation of first subscribers feeder time, above-mentioned memory location is selected from a plurality of memory locations according to first subscribers feeder self, and above-mentioned code word has indicated a voice message in a plurality of voice messages.
12, a kind of telephone exchange, it is substantially the same in before this with reference to the illustrated telephone exchange of each accompanying drawing.
CN98801848A 1997-01-15 1998-01-06 Telephone switching system Pending CN1243631A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP97300214 1997-01-15
EP97300214.0 1997-01-15

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CN1243631A true CN1243631A (en) 2000-02-02

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CN98801848A Pending CN1243631A (en) 1997-01-15 1998-01-06 Telephone switching system

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EP (1) EP0953250A1 (en)
JP (1) JP2001508623A (en)
KR (1) KR20000070162A (en)
CN (1) CN1243631A (en)
AU (1) AU5490198A (en)
CA (1) CA2277275A1 (en)
NZ (1) NZ336658A (en)
WO (1) WO1998032271A1 (en)

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IL121427A0 (en) 1997-07-30 1998-01-04 S H F Computers Software Servi System and method for off-line notifying a network user
KR20000030035A (en) * 1999-02-18 2000-06-05 김강석 Advertising Method using Ring-Back Tone
CA2369634A1 (en) * 1999-04-12 2000-10-19 Telsurf Networks, Inc. Transmission of audio or multimedia informational messages to users
JP2000341412A (en) 1999-05-27 2000-12-08 Nec Corp Tone send-out device for electronic private branch exchange
IL135670A0 (en) 2000-04-16 2001-05-20 Netgong Ltd Telephone tuning and signaling system
DE10319981A1 (en) * 2003-05-05 2004-12-16 Siemens Ag Multi-tonal sequences for use as connection status signaling sequences
NL2001230C2 (en) * 2008-01-29 2009-07-30 Adfortel B V Method for playing an advertisement as a callback tone, system for providing an advertisement as a callback tone, communication system comprising such a system.

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US4941167A (en) * 1988-11-04 1990-07-10 Motorola, Inc. Telephone system with customized central message center
EP0455912A2 (en) * 1990-05-11 1991-11-13 AT&T Corp. Electronic messaging system with multiple personal greetings
JPH05300246A (en) * 1991-06-12 1993-11-12 Nec Corp Automatic transmission system for busy state message in telephone communication
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US5528672A (en) * 1993-12-29 1996-06-18 At&T Corp. Telephone system with subscriber selected audio and image announcements
GB9514683D0 (en) * 1995-07-18 1995-09-13 British Telecomm Telephone exchange

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CA2277275A1 (en) 1998-07-23
AU5490198A (en) 1998-08-07
KR20000070162A (en) 2000-11-25
NZ336658A (en) 2001-01-26
EP0953250A1 (en) 1999-11-03
JP2001508623A (en) 2001-06-26
WO1998032271A1 (en) 1998-07-23

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