CA2070671A1 - Call interceptor - Google Patents
Call interceptorInfo
- Publication number
- CA2070671A1 CA2070671A1 CA002070671A CA2070671A CA2070671A1 CA 2070671 A1 CA2070671 A1 CA 2070671A1 CA 002070671 A CA002070671 A CA 002070671A CA 2070671 A CA2070671 A CA 2070671A CA 2070671 A1 CA2070671 A1 CA 2070671A1
- Authority
- CA
- Canada
- Prior art keywords
- telephone
- call
- extension
- pbx
- detecting
- 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.)
- Abandoned
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
- H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
- H04Q3/625—Arrangements in the private branch exchange
-
- 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
- H04M3/51—Centralised call answering arrangements requiring operator intervention, e.g. call or contact centers for telemarketing
- H04M3/5116—Centralised call answering arrangements requiring operator intervention, e.g. call or contact centers for telemarketing for emergency applications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2242/00—Special services or facilities
- H04M2242/30—Determination of the location of a subscriber
-
- 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
- H04M3/42314—Systems providing special services or facilities to subscribers in private branch exchanges
Abstract
A device for responsively providing, in cooperative association with the 911 emergency system, the number and location of a telephone, especially a PBX extension telephone, from which such a 911 emergency call originates. A first device (102) is installed between PBXs and the extensions thereof, with the number and location of each extension stored in the device's electronic memory. A
second such device (116) is installed at a Public Safety Answering Point (108). When 911 is dialed from an extension telephone of a PBX (110) equipped with a device (102) of the present invention, even if the extension receiver is still on-hook, the extension is connected over telephone lines to the second device (116) installed at the PSAP (108). The device (116) at the PSAP (108) then interrogates the device (102) at the PBX (110) which responsively transmits the location of the extension telephone (100) from which the call originated. The device (116) installed at the PSAP
(108) relays the location information to at least one computer (120) which informs an operator of the location of the calling phone.
second such device (116) is installed at a Public Safety Answering Point (108). When 911 is dialed from an extension telephone of a PBX (110) equipped with a device (102) of the present invention, even if the extension receiver is still on-hook, the extension is connected over telephone lines to the second device (116) installed at the PSAP (108). The device (116) at the PSAP (108) then interrogates the device (102) at the PBX (110) which responsively transmits the location of the extension telephone (100) from which the call originated. The device (116) installed at the PSAP
(108) relays the location information to at least one computer (120) which informs an operator of the location of the calling phone.
Description
WO g~/07439 P~/U~1/076~8 2~7~7~
Descri~ 5 .ion CALL INTERCEP'I'OR
Techni~al Field This invention relates to systPms and devices used in the telephone industry and more particularly concerns a device for automatically identifying, in cooperative association with the eimergency 911 system, the number.and location of a telephone, especially a PBX extension telephone, from which an emergency call originates.
;
Backqround Art Devices for automatically identi~yiny (tracing~ the number o~ a telephone from which a call originates do not comprise a new art, :.
per se. Call tracing devices of various types have been in use for years by the telephone :
company. Prîor to th~ present inv0ntion, howe~er, these devices have been difficult to ;!
implement, slow in operation, and unreliable.
These shortcomingsl coupled with the advent of th~i 911 and Enhanced 911 emergency systems, have made it apparent that a neied exists for a : 2~ way to automatically and specifically identify any te}ephona withln a specified geographic ar~a ~rDm which a ca}l is being made, eipecially extensions of Private Branch Exchanges (PBXs). This latter capability is particularly needed because, at the time of the '' W092/0743~ 57 ~ P~/U~91/076~8 present inventi~, al~ telephone trunk lines which connect t~e PBXs of multi-line entities ~uch as univ~rsities, hospitals, ~tc., to a Tel~phone Company's (TELCo~ Central Office (Co) are identically labelled with only the primary number which has been assigned to the PBX oE
that institution. Thi~ means that all extensions of such a multi-line P~X are identified with the same phone number; no extension telephones can be individually identified. Thus, amergency personnel miyht be delayed for-hours in locating the source of a call for help which originated at ~n extension telephone.
Furthermore, a need also exists for a means of quickly and reliably identifying the telephone numhers associated with other call originating t21ephones which are not associated with PBXs, including but not limited to ~'cordless" radio telephones and cellular telephones, for instance.
Accordingly, it is a principal obj~ct of the present invention to provide a system which includes devices capa~le of being install~d ~ither at a called point, such as the Public Safety ~nsw~ring Point (PSAP), Dr a calling point, such as a PBX, or both, and which will aut~matically provide th~ numher and loGation within a specified yeographic area o~ a telephone from which a call is originating, especially including PBX ext~nsions.
~07~671 Throughout this Application, the term l'PBX" will be used generically to represent the terms Private Branch Exchange, Private Automatic Branch Exchange, Centrex, Xey System, Electronic 501id State eXchange, or commercial manufacturer's brands of telephone systems.
Known prior art pertaining to the present invention includes Letters Patent granted to Anderson, et al, U. S. Patent number 3,967,073, Pankonen, ~t al, U.S. Patent number 4,~93,325, and Oliver, U.S. Patent number 4,839,917.
The device of ~nderson et al, hereinafter Anderson, while possessing some of the functions of the present invention, yet lacks certain important features, most notably the ability to seek alternate routes -for completing arl emergency 911 call if the selected line is unresponsive. Indeed, in at least his ~irst claim is included the limitating language "... means including said memory for inhibiting s~id ~electing means when said memory has reached its storage capacity and is unable to store additional call identity information...l' Further, Anderson teaches a requirement for two lines to complete any call, one ~or the caller's voice transmis6ion, and another for the ALI data~ His teaching does not include ~ny provision for tha current state o~ the art telephone~ which u~e radio ~requencies, nor any ability to code a key for use as a "panic button". Another limitation of the Anderson '.
WO~2/~7~3s ' PCT~US9~/076~8 7.~
device is the lack of a decoding proces~ to distinguish between a ~Idial 9" request to a P~X
~or an outside line,~and an emergency 911 call in a situation when every second may count.
The system descri~ed by Pankonen ~t al, hereinafter Pankonen, is ~or an improved version of an entire PsAP station, instead of simply a complementary device for use therewith and behind PBXs. The title of the patent granted to Pankonen is an "Integrated Public Safety Answering Point System". Pankonen deals, with improving the larger system and has no teaching or provision ~or identifying an individual extension of a PBX.
Similarly, the line status monitoring system of Oliver is a large and sophistica~ed system ~or monitoring the status of a great many tel~phones and reporting the activity of each to a central computer. Very few, if any, of the PBX owners/users targeted by the device of the present invention could afford or justi~y such an elaborat~ system. Therefore, such a system, being unafPordable and, thus, uninstalled and unutilized, does not represent a workable solution to the problem addre~sed by the present inv~ntion. ~oreov r, while the ,-;
system o~ Oliver could report various alarm ~ituations, if such a system were installed, ,.
the simple act o~ dialing a nine and two ones to r~ach a PSAP, especially ~he PSAP
appropria~2 to the caller, is not addressed in W092f~7439 ~CT/U~91/076~
2~)7~671 -his teaching. Rather, all monitored phone events, which are id~ntified as alarms, go to an a~sociated computer.
Disclosure o~ the Invention i.
. other objects and advantages will be accomplished by the present invention which provides a method of identi~ying the number of any telephone wikhin a specifi~d geographic area from which a call is originated. The . system of the present invention consists of at least one device of the present invention installed at a Public Safety Answering Point, and at least one device of the present invention installed betwee.n the PBX of an entity which uses multiple telephone lines and the multiple extension telephones associated with such a PBX.
A device of the present invention, which is designated a Call Interceptor (CI), is ~.
comprised of an eleckronic circuitl similar to a miniature comput~r. It is intended for installation sn, and inter~acing with, existing :-.
telepho~e line equipment, such as PBXs, or the :~
lik~t so as to allow ~uch existing equipment to : ~ be ~ompatible with today's 911 and E911 emergency reporting syst~ms. Each such CI . ~ -devic~ pos~esses a programmable memory for storing the lQcakion and identification data of :~
: a plurality of telephones. This device is deslgned to accommodate a wide variety o~
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W092/07~39 PCT/~S91/07 6~ ~ 6 equipment and sit~ations. At the calling end of the system, as at a PBX, for instance, the number and loca,tion o~ each individual extension telephone of such PBX, when used to originate a 911 emergency call, will be responsively provided by the CI to certain equipment, preferably ~nother device of the presen~ invention, installed at certain called points, as Public Sa~ety Answering Points, for instance. Another feature o~ the device of the present invention which can be provided at the calling end is called a Panic Button. The Panic Button can be an existing telephone key which has been progra~med to initiate the pAnic Button situation. ~hen pres~ed, the Panic ~u~ton lnitiates an electronic circuit action which si~ulates the dialing o~ 911.
When installed at the called end of the system, the CI device will send an interrogating signal to the CI device at the calling end, in order to obtain the number and location information of the telephone at the calling end. The called end CI is also capa~le of providing ANI and ALI ~or state of the art deYices such as "cordless" telephones and callular t~lephone~, a~ well as Telco CO phone linesc When install~d at a PBX, the call int~rc~ptor electrically comes between the PBX
and its associated extension telephones. ~ach intercep~or device has its own i~ternally W092/07439 ~CT/US91/07688 ~ 0~
. . .
stnred data base, containing the number and location of every onP of th~ PBX's extensions.
or individual telephones in a designated gèographic area. When an extenision is taken o~-hook, it is the call intPrcQptor which fir t receives the ~ignal. The CI breaks the :::
dial tone and determines from the digits dialed whether the call is a 911 emergency call or not. I~ it is not, control is passed on to the PBX for normal operation. If the call is a 911 emergency call, the CI causes the PBX to outdial the num~er of the Public Safety Answering Point (PSAP) whiFh serves the area in which the calling telephone is located. A CI
installed at the PSAP processes the call and interrogates the calling CI. The calling CI
then rei~ponsively identifies, from its internal data base, the extension number and location of the calling exten~ion to the CI at the PSAP, allowing the PSAP operator to direct emergency personnel to that location without delay.
The CI installed at the PSAP is identical to the one installed at the PBX. Although the CIs at both points have internal data bases with which to identi~y call originating ~elephones, the CI at the PSAP interrogates and ~.
identifies incoming calls. The CI at the PBX, on ~he other hand, responsivaly provides identification of outg~ing ~ialli~ when 3~ interrogated to do i80 by the PSAP CI. Also provided is a ~eature for outdialing ~'`'"
, '.':
W~2/~7439 PCT/US91/~7~8 6~ 8 preselected alternate route numbers or lFB
lines in case the first dialed number is not responsive.
Brief Description of the Drawinqs The a~ove-mentioned features of the invention will ~ecome more clearly understood frem the ~ollowing detailed description when raad together with the drawings in which:
Figure 1 is a simplified diagram representative o~ the system in which the devices of the present invention can bP
u~ilized.
Figure 2 is a process flow chart diagram of a device of the present invention as installed at a PBX to provide individual . .
identi~ication of an extension telephone ~rom which a call is originated~
Figure 3 is a simpli~ied block ~low diagram of a system utilizing a device o~ the present invention desi~ned for installation at the called point (PSAP).
: A device for responsively providingl in ~ooperative association with the 911 emergency system, the number and location of any telephone, especially including a P~X extension telephone, ~rom which a call originates.
The operation of a system utilizing two devices constructed in accordance with various WO92/07~139 PCT/US91/n7688 ~070~71''' features of the present invention is illustrated in block diaqram ~orm in Figure 1.
A first of two devic~s o~ the present invention, designated 102, is installed at a P~X 110. A second such device, designated 116, is installed at a Public Sa~ety Answering Point (PSAP) 108.
When an idle extension ~elephone 130 is taken off-hook, or if the Panic Button is pressed, the devicP 102 intercepts the call ...
and, at 104, analyzes the digits dialed. ~f the number dialed is 911, the device 102 causes the PBX 110 to outdial the stored number 106 of the PSAP 108 for that geographic area. If the number is not 911, the device 102 returns control to the PBX 110. In either case, the call goes through the PBX 110 to the Telco Central Office (CO) 1~2 through a line in one of the trunks 114. ~rom the CO 112, the call goes over the appropriate line to the Public Safety ~nswering Point 108. Here, the answerlng point Call Interceptor device 116 processes the call, decoding it at 11~ and converting it into Am rican S~andard Code for Information Interchange (AS~II). In this form, the call data is routed to a computer ~20, a printer 122, a CRT screen 126 installed in the operator's console 128, and tha interrogator circuit 130. The interrogator circuit 130 3a polls the calling CI d~vice 102 ~or its id~ntifying data and also searches ltS own data : , :.
..
,~
,: .
...
i' ..
W~92/07~3~ PCT/U~91/076~8 1~
base of information. Optionally, a 911 data base 134 may be utilized for this purpose.
Because all of this action has taken place at the speed o~ electronic~, the identi~ying and locating ~ata is ready for display on the CRT 126 of the operator's console 128 when the operator answers the call by taking telephone T2 136 o~f-hook. At this point, the PSAP 108 operator is able to engage the caller in conversation and take whatever action is necessary to deal with the emergency situation.
. The calling telephone can be identified by the device 116 even if it is a "cordless'l radio telephone or cellular phone.
Figure 2 contains a flow chart diagram giving a more detailed description o~ the operation o~ the CI device 102 Q~ the prssent invention as installed at the PBX 110.
The diagram o~ the sequence of events begins at S~ART 11, which leads to decision box 12. Decision bo~ 12 indicates that the device -:
- 102 is in a waiting loop as long as no PBX
extension phone 100 has been taken o~f-hook and the Panic Button has not been pr~ssed, indicated by the status of decision box 20.
When an extension phone 100 is taken of~ hook, the answ~r to the question o~ decision box 12 becomes YES, so the call interceptor device 102 takes control o~ the phone lines from kha PBX
110 at proce~s box 13 and generates a dial tone at 14. If a ~igit ls dialed, as at 15, the , W~92~07~3~ P~T/U~ 76~
2~7~7~ :
11 , .
dial tone is suppres6ed at 16 to indicate that a digit was dialed~ ... .
However, at 12 again, the phone 100 need not be taken o~-hook if the 911 Panic ~utton is pushed, making the answer to the question at decision box 20 YES, at which time the devlce 102 will operate as i~ 911 had been dialed on a telephone, bypassing ~tages 12 to 19, and going directly to decision box 28 which is reache.d by following o~-page conn~ctor A. Even i~ the extension phone 100 is ta~en off-hook, if the Panic But~on has been pressed, with the answer to the question at decision box 20 still being YES, the device 102 again will operate as if 911 had been dialed, the only difference being ~hat the dial tone at operation box 16 will be suppressed, as indicated by decision box 22, which is in parallel With the timer decision box at the NO output of decision box 15. :
At d~cision ~ox 15, the device 102 checks.
to see if a digit has be~n dialed. Until a `;
digit has been dialed, or the Panic Button has been pressed, th~ answer to the electronic questio~ at 15 remains NO. This condition ~ :
activates the timer repres~nted by decision box 23. The timer is al~o activated by opera~ion of the Panic button, a~ indicated by decision :' box 22. Unt~l the expiration o~ the allo~t~d time, tha an~wer at decision box 22 is also N0, which causes the completion o~ a loop requiring the continuous generation o~ the dial tone a~
~'' ' .:
W092/07439 PCT/US91/a7688 6~ ~
1~
14 while the device 102 continues to check ~or the dialing of a digit at 15 or ~aving the Panic Button set at pro~es~ box 21. I~ a specified time limit, such as one minute, for S example, expires without a digit's having b~en dialed, the answer to decision box 22 becomes YES~ At this time, if the PSAP local option at box 24 has not been set, the No answer allows control to be returned to the PBX 110 at 54, which is shown by following the off-page connector G to X and K to 54. If the PSAP
local option haq been set at decision box 24, the YES answer leads ~he process flow, through of~-page connector F, to cause the device 102 to outdial the prestored number of the call interceptor device 116 which is installed at the PSAP, as indicated at process box 35.
When a digit is dialed within the allotted - .
time period, the an~wer to decision box 15 2n becomes YES and the device 102 suppresses the dial tone at 16. At decision box 17, the ~irst digit is examined. rf the first digit is not a .
nine (the answer at decision box 17 is No), then the call is not an emer~ency call and the first digit is pass~d to decision box 25. At deci~ion box 25, the ~irst digit is examined again. If the digit is not a one, making the answer at decision box 25 N0, the call is not a ~:
1~ type long distance call and the first digit is passed on to decision box 27 for further .:
examination. }f the digit is a one, then the W~2/~7439 P~r/VS91/076~8 ~o~a~
. ~3 answer at decision box 25 is YES and the call is a l+ long distanc call, as at process box 26, and the process moves through off-page connector E to process box 46.
If the first digit, as examined at 27, is a zero, the call is identified, through off-page connector D, as being a 0+ long distance call, at box 42, which also leads to process box 46. . `
If ~he first digit is not a nine, not a one, and not a zero, the answer at 27 is also NO, and the first digit is examined still ayain, through off-page connector C, at 43 to .
see i~ it is an asterisk, *. If the first .
digit is not an asterisk, either, the call is det2rmin0d to be a local calll going to process ~.
box 44. It 6hould be noted that the * used here is an arbitrary deslgnation, and the code, inst~ad of an asterisk, can be a single or multiple digit string that allows PBX intra- :
access. Rules ~or thi~ operation require that the digit (s) us~d are not part of the local NNXs. Rotary phon~s would dial a one- or two-digit string. If the digit at 43 is an asterisk, the call is id~ntified as being an - intra-PBX type call, as sho~n at ~ox 45, which also leads to the function at process box 46.
This sel~ctive digit examination and identi~ication ~unction is an important feature , o~ the device o~ ~he present invention, and one :~, W092/07439 PCT/US9~/076B8 9~
of the things that set it apart from other d~vices in this field of endeavorO
I~tra PBX calls begin by detecting the PBX
dial tone at pro ess box 46, following which a check is made at box 47 to ~ee if a special access digit is needed. I~ it is, the device 102 dials the accass digit at 48, checks ~or a second dial tone at 49, detects the second dlal tone at 50, follows off-page connector 3 to outpulse the dialed digits to the PBX at 58, and returns control to the PBX at 54. If no special access code is needed, yielding a NO
answer at 47, boxes ~7 through 50 are bypassed.
Similarly, i~ there is no second dial tone, i.e., a N0 answer at 49, then 50 is bypassed.
Back on the first page of the flow chart, if the answer at the output of decision box 17 is YES, meaning that the ~irst digit is a nine, then the device 102 checks at decision ~ox 18 to see if the second digit equals 1. If this answer is YES, tha procedure moves to decision box 19 where the third digit is examin~d. If the answer at 18 or 19 is NO, this call is also :
a local call, again reaching process box 44, this time through off-page connector B.
However, at decision box 19, if tha third digit is a 1, the call is a 911 emergen~y call and the procedure mov~s through of~page . .
connector A to d~cision box 28. If the PBX 1~0 at which a particular CI device 102 is install~d requires that an access digit be W~92/~7439 P~Ti~591~075~8 21~7067~
~5 dialed (such as 9, ~or instance, ~or an outside line), then a total o~ four digits would be re~ui.rad to obtain 911 ~9911). If the answer at decision box 2B is YES, a customization feature of the device 102, allowing the device 102 to be used with variou~ models o~ PBX llo, is activated. PBX dial tone is detected at process box 29 and, at 30, if four digits are , required, the process beginning at box 31 is initiated. Following the outpulsing of a digit 9 at 31, the device 102 checks for a second dial tone at 32. If there is one, the dial tone is detected at 33 and, whether there is a second dial tone or not, and also ~or PBXs of the three-di~it kype, at the output of decision box 30, the procedure flow moveC to decision box 34. If the PBX will not reroute the 911 call ~t 34, the next step in the process will ~.:
be box 35.
However, b2fore following the process any -:
~urther in this p~th, it is nacessary to return to box 28. I~ the answer to decision box 28 is N0, the PBX dial tone is detected at process box 38 and a local access code is outpulsed at box 33, fellowlng which the presence of a second dial tone is chec~d for at 40. If one is present, it is detected at 41 and, whether a second dial tone was present or not, the procedure again moves to process box 35.
At 34, if the PBX 110 will reroute the outgoing 911 call so as to allow the CI àe~rice ':
- , - , . :,, : - ........................... .
. : . . , , , ~, , 'i!,6~ 9~
lO~ to provide ID and location data to the interrogating device 116, tha answer is YES and the digits 911 are passed to the PBX 110 at 37, with control r~turned at 54, which can be seen by îullowing ofjf-pag~ connector I. Note that, for both the passing of the digits 911 at box 37 and the outdialing of the number of the device 116 installed at the PSAP, the device 102 checks at 36 for an interrogating signal to be received from the device 116, If the PBX 110 will not reroute the call, the answer at 34 is NO and the next step in the sequence is to perform the OUTDIAL command at 35. Then, at 36, having dialed the number of the PS~P at box 35 t the device 102 is in a loop awaiting interrogation from the CI 116 installed at the PSAP 108. When the interrogation is received and the answer at 36 . becomes ~ES, ~ollowing o~f-page conrlector H, `~
the device 102 accesses its data base at 51 for . .
the identification and location data of the extension telephone 100 which was used to dial 911, and transmits this data at 52 to the i~terrogating deYice 116. At 53, as long as the extension 1-00 remains off-hook, the device : 102 checks at 57 to see if an acknowledging signal (ACX) has been received. If not, and as long as a second timer at 58 has not timed out, the device continues to output ID data at 52.
When ACK has been racei~ed, the YES at 57 stops WOg~/07439 PCr/US91/07688 ~07~7~:
the rep~tition of ID data. If ACK has not be~n received and a s~cond timer has tim d out (a YES at 58), the device 102 dials an alternate route or lFB line at 59 for the 911 call. This is an important feature of the device o~ the present invention. Prior art devices have no provision for selecting alternate routes if a connection at the dialed number cannot be accomplished. When the extension 100 has been hung up, the answer at 53 becomes N0, and control is returned to the PBX 110 at 54. When this occurs, the devire is reset, as at 55, "Return to Start." .
Thus, it will be seen by those skilled in the art that the CI device 102 not only allows the dialing o~ 911 for emergencies, but also allows the user to dial local and long distance calls as if a resident telephone were being used, This i8 an inherent operation o~ the CI
102.
After 911 has been dialed and the PBX 110, at 3~, has outdialed the number for the area PSAP 108, the sequence o~ events at the PSAP
108, as diagrammed in Figure 3, begins at 60 wlth the Personal Computer 120 ~enerating the legend "Wai~ing for next cal}," 62, on the CRT
screen of the operator's consol~ ~28. At 64~
an incoming call i~ received by CI 116, at 66. .:
At 68, CX 116 transmiks a polling signal ~o (interrogates) the calling CI, 102. At 70, the calling CI 102 responslvely returns the 61~ 1~
inXormation identi~ying the telQphone loo originating the callO At 72, the Dual Tone Modulatlng Frequency (DTMF) signals received ~rom the calling CI 102 are converted to ASCII
signals. The ASCII coded signals are ~ed at 74 to the Personal Computer 120, which generate~
an Alert Tone at 76. At 78, the computer 120 th~n writes on the CRT 126 screen and the printer 122, the number of the telephone 100 from which the incoming call originated.
The flow of the diagram next moves from 78 to 80 to 80' and 82, where th~ computer 120 writes "Decoding Input" to the screen 126 and printer 122 of the operator at the PSAP 108.
At 84, the area code, exchange ("NNX") t a~d individual telephone numb~r digits ("remaining digits") are assigned to variable storage names and locations in the memory o~ computer 120.
At 86, the computer 120 next writes "Decoded"
to the screen, 126/ and the printer, 122, ~ollowed by the number and location, 88, of the telephone 100 ma~ing th~ incoming call, together with the dake and time at which the : .
call is being made.
At 90, the PSAP operator a~swers the ~elephone 136 and, at 9Z, initiates the required actions to d~al with the inco~ing emergency call. As long as the calling telephone 100 xemains o~f-hook, the location .
and identi~ication in~ormation about that ~ ;.~ . :.., W092/07~39 PCT/V~91/07~8~
19 2~7~7~
telephone continues to be supplied to the devi~e 116 at the PSAP.
At tha conclusion of the situation, both parties hang up and conditions at the PSAP
re~urn ~o standby, 60' and 60 in the diagram~ -~rom the foregoing detailed description, it can be seen that a device capable of supplying the identifying number and location of telephones initiating a 911 emergency call, e~pecially PBX extension telephones, has been described. While features of a preferred embodiment have been mentioned in connection with the disclosure of the present invention, it will be underskood that no intent has been made to limit the invention to such dlsclosure, but rather the intention of such disclosure has been to cover all modi~ications and alternate constructions falling within the spirit and scope of the invention as defined in the appended claima.
Accordingly, this invention is limited only by the claims appended hereto, and their equivalents, when taken in combination with the complete de~cription contained herein.
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Descri~ 5 .ion CALL INTERCEP'I'OR
Techni~al Field This invention relates to systPms and devices used in the telephone industry and more particularly concerns a device for automatically identifying, in cooperative association with the eimergency 911 system, the number.and location of a telephone, especially a PBX extension telephone, from which an emergency call originates.
;
Backqround Art Devices for automatically identi~yiny (tracing~ the number o~ a telephone from which a call originates do not comprise a new art, :.
per se. Call tracing devices of various types have been in use for years by the telephone :
company. Prîor to th~ present inv0ntion, howe~er, these devices have been difficult to ;!
implement, slow in operation, and unreliable.
These shortcomingsl coupled with the advent of th~i 911 and Enhanced 911 emergency systems, have made it apparent that a neied exists for a : 2~ way to automatically and specifically identify any te}ephona withln a specified geographic ar~a ~rDm which a ca}l is being made, eipecially extensions of Private Branch Exchanges (PBXs). This latter capability is particularly needed because, at the time of the '' W092/0743~ 57 ~ P~/U~91/076~8 present inventi~, al~ telephone trunk lines which connect t~e PBXs of multi-line entities ~uch as univ~rsities, hospitals, ~tc., to a Tel~phone Company's (TELCo~ Central Office (Co) are identically labelled with only the primary number which has been assigned to the PBX oE
that institution. Thi~ means that all extensions of such a multi-line P~X are identified with the same phone number; no extension telephones can be individually identified. Thus, amergency personnel miyht be delayed for-hours in locating the source of a call for help which originated at ~n extension telephone.
Furthermore, a need also exists for a means of quickly and reliably identifying the telephone numhers associated with other call originating t21ephones which are not associated with PBXs, including but not limited to ~'cordless" radio telephones and cellular telephones, for instance.
Accordingly, it is a principal obj~ct of the present invention to provide a system which includes devices capa~le of being install~d ~ither at a called point, such as the Public Safety ~nsw~ring Point (PSAP), Dr a calling point, such as a PBX, or both, and which will aut~matically provide th~ numher and loGation within a specified yeographic area o~ a telephone from which a call is originating, especially including PBX ext~nsions.
~07~671 Throughout this Application, the term l'PBX" will be used generically to represent the terms Private Branch Exchange, Private Automatic Branch Exchange, Centrex, Xey System, Electronic 501id State eXchange, or commercial manufacturer's brands of telephone systems.
Known prior art pertaining to the present invention includes Letters Patent granted to Anderson, et al, U. S. Patent number 3,967,073, Pankonen, ~t al, U.S. Patent number 4,~93,325, and Oliver, U.S. Patent number 4,839,917.
The device of ~nderson et al, hereinafter Anderson, while possessing some of the functions of the present invention, yet lacks certain important features, most notably the ability to seek alternate routes -for completing arl emergency 911 call if the selected line is unresponsive. Indeed, in at least his ~irst claim is included the limitating language "... means including said memory for inhibiting s~id ~electing means when said memory has reached its storage capacity and is unable to store additional call identity information...l' Further, Anderson teaches a requirement for two lines to complete any call, one ~or the caller's voice transmis6ion, and another for the ALI data~ His teaching does not include ~ny provision for tha current state o~ the art telephone~ which u~e radio ~requencies, nor any ability to code a key for use as a "panic button". Another limitation of the Anderson '.
WO~2/~7~3s ' PCT~US9~/076~8 7.~
device is the lack of a decoding proces~ to distinguish between a ~Idial 9" request to a P~X
~or an outside line,~and an emergency 911 call in a situation when every second may count.
The system descri~ed by Pankonen ~t al, hereinafter Pankonen, is ~or an improved version of an entire PsAP station, instead of simply a complementary device for use therewith and behind PBXs. The title of the patent granted to Pankonen is an "Integrated Public Safety Answering Point System". Pankonen deals, with improving the larger system and has no teaching or provision ~or identifying an individual extension of a PBX.
Similarly, the line status monitoring system of Oliver is a large and sophistica~ed system ~or monitoring the status of a great many tel~phones and reporting the activity of each to a central computer. Very few, if any, of the PBX owners/users targeted by the device of the present invention could afford or justi~y such an elaborat~ system. Therefore, such a system, being unafPordable and, thus, uninstalled and unutilized, does not represent a workable solution to the problem addre~sed by the present inv~ntion. ~oreov r, while the ,-;
system o~ Oliver could report various alarm ~ituations, if such a system were installed, ,.
the simple act o~ dialing a nine and two ones to r~ach a PSAP, especially ~he PSAP
appropria~2 to the caller, is not addressed in W092f~7439 ~CT/U~91/076~
2~)7~671 -his teaching. Rather, all monitored phone events, which are id~ntified as alarms, go to an a~sociated computer.
Disclosure o~ the Invention i.
. other objects and advantages will be accomplished by the present invention which provides a method of identi~ying the number of any telephone wikhin a specifi~d geographic area from which a call is originated. The . system of the present invention consists of at least one device of the present invention installed at a Public Safety Answering Point, and at least one device of the present invention installed betwee.n the PBX of an entity which uses multiple telephone lines and the multiple extension telephones associated with such a PBX.
A device of the present invention, which is designated a Call Interceptor (CI), is ~.
comprised of an eleckronic circuitl similar to a miniature comput~r. It is intended for installation sn, and inter~acing with, existing :-.
telepho~e line equipment, such as PBXs, or the :~
lik~t so as to allow ~uch existing equipment to : ~ be ~ompatible with today's 911 and E911 emergency reporting syst~ms. Each such CI . ~ -devic~ pos~esses a programmable memory for storing the lQcakion and identification data of :~
: a plurality of telephones. This device is deslgned to accommodate a wide variety o~
' - ; . ' ':: i ' ~ ? ., ,, -': ' .- . ' .. .. ...
W092/07~39 PCT/~S91/07 6~ ~ 6 equipment and sit~ations. At the calling end of the system, as at a PBX, for instance, the number and loca,tion o~ each individual extension telephone of such PBX, when used to originate a 911 emergency call, will be responsively provided by the CI to certain equipment, preferably ~nother device of the presen~ invention, installed at certain called points, as Public Sa~ety Answering Points, for instance. Another feature o~ the device of the present invention which can be provided at the calling end is called a Panic Button. The Panic Button can be an existing telephone key which has been progra~med to initiate the pAnic Button situation. ~hen pres~ed, the Panic ~u~ton lnitiates an electronic circuit action which si~ulates the dialing o~ 911.
When installed at the called end of the system, the CI device will send an interrogating signal to the CI device at the calling end, in order to obtain the number and location information of the telephone at the calling end. The called end CI is also capa~le of providing ANI and ALI ~or state of the art deYices such as "cordless" telephones and callular t~lephone~, a~ well as Telco CO phone linesc When install~d at a PBX, the call int~rc~ptor electrically comes between the PBX
and its associated extension telephones. ~ach intercep~or device has its own i~ternally W092/07439 ~CT/US91/07688 ~ 0~
. . .
stnred data base, containing the number and location of every onP of th~ PBX's extensions.
or individual telephones in a designated gèographic area. When an extenision is taken o~-hook, it is the call intPrcQptor which fir t receives the ~ignal. The CI breaks the :::
dial tone and determines from the digits dialed whether the call is a 911 emergency call or not. I~ it is not, control is passed on to the PBX for normal operation. If the call is a 911 emergency call, the CI causes the PBX to outdial the num~er of the Public Safety Answering Point (PSAP) whiFh serves the area in which the calling telephone is located. A CI
installed at the PSAP processes the call and interrogates the calling CI. The calling CI
then rei~ponsively identifies, from its internal data base, the extension number and location of the calling exten~ion to the CI at the PSAP, allowing the PSAP operator to direct emergency personnel to that location without delay.
The CI installed at the PSAP is identical to the one installed at the PBX. Although the CIs at both points have internal data bases with which to identi~y call originating ~elephones, the CI at the PSAP interrogates and ~.
identifies incoming calls. The CI at the PBX, on ~he other hand, responsivaly provides identification of outg~ing ~ialli~ when 3~ interrogated to do i80 by the PSAP CI. Also provided is a ~eature for outdialing ~'`'"
, '.':
W~2/~7439 PCT/US91/~7~8 6~ 8 preselected alternate route numbers or lFB
lines in case the first dialed number is not responsive.
Brief Description of the Drawinqs The a~ove-mentioned features of the invention will ~ecome more clearly understood frem the ~ollowing detailed description when raad together with the drawings in which:
Figure 1 is a simplified diagram representative o~ the system in which the devices of the present invention can bP
u~ilized.
Figure 2 is a process flow chart diagram of a device of the present invention as installed at a PBX to provide individual . .
identi~ication of an extension telephone ~rom which a call is originated~
Figure 3 is a simpli~ied block ~low diagram of a system utilizing a device o~ the present invention desi~ned for installation at the called point (PSAP).
: A device for responsively providingl in ~ooperative association with the 911 emergency system, the number and location of any telephone, especially including a P~X extension telephone, ~rom which a call originates.
The operation of a system utilizing two devices constructed in accordance with various WO92/07~139 PCT/US91/n7688 ~070~71''' features of the present invention is illustrated in block diaqram ~orm in Figure 1.
A first of two devic~s o~ the present invention, designated 102, is installed at a P~X 110. A second such device, designated 116, is installed at a Public Sa~ety Answering Point (PSAP) 108.
When an idle extension ~elephone 130 is taken off-hook, or if the Panic Button is pressed, the devicP 102 intercepts the call ...
and, at 104, analyzes the digits dialed. ~f the number dialed is 911, the device 102 causes the PBX 110 to outdial the stored number 106 of the PSAP 108 for that geographic area. If the number is not 911, the device 102 returns control to the PBX 110. In either case, the call goes through the PBX 110 to the Telco Central Office (CO) 1~2 through a line in one of the trunks 114. ~rom the CO 112, the call goes over the appropriate line to the Public Safety ~nswering Point 108. Here, the answerlng point Call Interceptor device 116 processes the call, decoding it at 11~ and converting it into Am rican S~andard Code for Information Interchange (AS~II). In this form, the call data is routed to a computer ~20, a printer 122, a CRT screen 126 installed in the operator's console 128, and tha interrogator circuit 130. The interrogator circuit 130 3a polls the calling CI d~vice 102 ~or its id~ntifying data and also searches ltS own data : , :.
..
,~
,: .
...
i' ..
W~92/07~3~ PCT/U~91/076~8 1~
base of information. Optionally, a 911 data base 134 may be utilized for this purpose.
Because all of this action has taken place at the speed o~ electronic~, the identi~ying and locating ~ata is ready for display on the CRT 126 of the operator's console 128 when the operator answers the call by taking telephone T2 136 o~f-hook. At this point, the PSAP 108 operator is able to engage the caller in conversation and take whatever action is necessary to deal with the emergency situation.
. The calling telephone can be identified by the device 116 even if it is a "cordless'l radio telephone or cellular phone.
Figure 2 contains a flow chart diagram giving a more detailed description o~ the operation o~ the CI device 102 Q~ the prssent invention as installed at the PBX 110.
The diagram o~ the sequence of events begins at S~ART 11, which leads to decision box 12. Decision bo~ 12 indicates that the device -:
- 102 is in a waiting loop as long as no PBX
extension phone 100 has been taken o~f-hook and the Panic Button has not been pr~ssed, indicated by the status of decision box 20.
When an extension phone 100 is taken of~ hook, the answ~r to the question o~ decision box 12 becomes YES, so the call interceptor device 102 takes control o~ the phone lines from kha PBX
110 at proce~s box 13 and generates a dial tone at 14. If a ~igit ls dialed, as at 15, the , W~92~07~3~ P~T/U~ 76~
2~7~7~ :
11 , .
dial tone is suppres6ed at 16 to indicate that a digit was dialed~ ... .
However, at 12 again, the phone 100 need not be taken o~-hook if the 911 Panic ~utton is pushed, making the answer to the question at decision box 20 YES, at which time the devlce 102 will operate as i~ 911 had been dialed on a telephone, bypassing ~tages 12 to 19, and going directly to decision box 28 which is reache.d by following o~-page conn~ctor A. Even i~ the extension phone 100 is ta~en off-hook, if the Panic But~on has been pressed, with the answer to the question at decision box 20 still being YES, the device 102 again will operate as if 911 had been dialed, the only difference being ~hat the dial tone at operation box 16 will be suppressed, as indicated by decision box 22, which is in parallel With the timer decision box at the NO output of decision box 15. :
At d~cision ~ox 15, the device 102 checks.
to see if a digit has be~n dialed. Until a `;
digit has been dialed, or the Panic Button has been pressed, th~ answer to the electronic questio~ at 15 remains NO. This condition ~ :
activates the timer repres~nted by decision box 23. The timer is al~o activated by opera~ion of the Panic button, a~ indicated by decision :' box 22. Unt~l the expiration o~ the allo~t~d time, tha an~wer at decision box 22 is also N0, which causes the completion o~ a loop requiring the continuous generation o~ the dial tone a~
~'' ' .:
W092/07439 PCT/US91/a7688 6~ ~
1~
14 while the device 102 continues to check ~or the dialing of a digit at 15 or ~aving the Panic Button set at pro~es~ box 21. I~ a specified time limit, such as one minute, for S example, expires without a digit's having b~en dialed, the answer to decision box 22 becomes YES~ At this time, if the PSAP local option at box 24 has not been set, the No answer allows control to be returned to the PBX 110 at 54, which is shown by following the off-page connector G to X and K to 54. If the PSAP
local option haq been set at decision box 24, the YES answer leads ~he process flow, through of~-page connector F, to cause the device 102 to outdial the prestored number of the call interceptor device 116 which is installed at the PSAP, as indicated at process box 35.
When a digit is dialed within the allotted - .
time period, the an~wer to decision box 15 2n becomes YES and the device 102 suppresses the dial tone at 16. At decision box 17, the ~irst digit is examined. rf the first digit is not a .
nine (the answer at decision box 17 is No), then the call is not an emer~ency call and the first digit is pass~d to decision box 25. At deci~ion box 25, the ~irst digit is examined again. If the digit is not a one, making the answer at decision box 25 N0, the call is not a ~:
1~ type long distance call and the first digit is passed on to decision box 27 for further .:
examination. }f the digit is a one, then the W~2/~7439 P~r/VS91/076~8 ~o~a~
. ~3 answer at decision box 25 is YES and the call is a l+ long distanc call, as at process box 26, and the process moves through off-page connector E to process box 46.
If the first digit, as examined at 27, is a zero, the call is identified, through off-page connector D, as being a 0+ long distance call, at box 42, which also leads to process box 46. . `
If ~he first digit is not a nine, not a one, and not a zero, the answer at 27 is also NO, and the first digit is examined still ayain, through off-page connector C, at 43 to .
see i~ it is an asterisk, *. If the first .
digit is not an asterisk, either, the call is det2rmin0d to be a local calll going to process ~.
box 44. It 6hould be noted that the * used here is an arbitrary deslgnation, and the code, inst~ad of an asterisk, can be a single or multiple digit string that allows PBX intra- :
access. Rules ~or thi~ operation require that the digit (s) us~d are not part of the local NNXs. Rotary phon~s would dial a one- or two-digit string. If the digit at 43 is an asterisk, the call is id~ntified as being an - intra-PBX type call, as sho~n at ~ox 45, which also leads to the function at process box 46.
This sel~ctive digit examination and identi~ication ~unction is an important feature , o~ the device o~ ~he present invention, and one :~, W092/07439 PCT/US9~/076B8 9~
of the things that set it apart from other d~vices in this field of endeavorO
I~tra PBX calls begin by detecting the PBX
dial tone at pro ess box 46, following which a check is made at box 47 to ~ee if a special access digit is needed. I~ it is, the device 102 dials the accass digit at 48, checks ~or a second dial tone at 49, detects the second dlal tone at 50, follows off-page connector 3 to outpulse the dialed digits to the PBX at 58, and returns control to the PBX at 54. If no special access code is needed, yielding a NO
answer at 47, boxes ~7 through 50 are bypassed.
Similarly, i~ there is no second dial tone, i.e., a N0 answer at 49, then 50 is bypassed.
Back on the first page of the flow chart, if the answer at the output of decision box 17 is YES, meaning that the ~irst digit is a nine, then the device 102 checks at decision ~ox 18 to see if the second digit equals 1. If this answer is YES, tha procedure moves to decision box 19 where the third digit is examin~d. If the answer at 18 or 19 is NO, this call is also :
a local call, again reaching process box 44, this time through off-page connector B.
However, at decision box 19, if tha third digit is a 1, the call is a 911 emergen~y call and the procedure mov~s through of~page . .
connector A to d~cision box 28. If the PBX 1~0 at which a particular CI device 102 is install~d requires that an access digit be W~92/~7439 P~Ti~591~075~8 21~7067~
~5 dialed (such as 9, ~or instance, ~or an outside line), then a total o~ four digits would be re~ui.rad to obtain 911 ~9911). If the answer at decision box 2B is YES, a customization feature of the device 102, allowing the device 102 to be used with variou~ models o~ PBX llo, is activated. PBX dial tone is detected at process box 29 and, at 30, if four digits are , required, the process beginning at box 31 is initiated. Following the outpulsing of a digit 9 at 31, the device 102 checks for a second dial tone at 32. If there is one, the dial tone is detected at 33 and, whether there is a second dial tone or not, and also ~or PBXs of the three-di~it kype, at the output of decision box 30, the procedure flow moveC to decision box 34. If the PBX will not reroute the 911 call ~t 34, the next step in the process will ~.:
be box 35.
However, b2fore following the process any -:
~urther in this p~th, it is nacessary to return to box 28. I~ the answer to decision box 28 is N0, the PBX dial tone is detected at process box 38 and a local access code is outpulsed at box 33, fellowlng which the presence of a second dial tone is chec~d for at 40. If one is present, it is detected at 41 and, whether a second dial tone was present or not, the procedure again moves to process box 35.
At 34, if the PBX 110 will reroute the outgoing 911 call so as to allow the CI àe~rice ':
- , - , . :,, : - ........................... .
. : . . , , , ~, , 'i!,6~ 9~
lO~ to provide ID and location data to the interrogating device 116, tha answer is YES and the digits 911 are passed to the PBX 110 at 37, with control r~turned at 54, which can be seen by îullowing ofjf-pag~ connector I. Note that, for both the passing of the digits 911 at box 37 and the outdialing of the number of the device 116 installed at the PSAP, the device 102 checks at 36 for an interrogating signal to be received from the device 116, If the PBX 110 will not reroute the call, the answer at 34 is NO and the next step in the sequence is to perform the OUTDIAL command at 35. Then, at 36, having dialed the number of the PS~P at box 35 t the device 102 is in a loop awaiting interrogation from the CI 116 installed at the PSAP 108. When the interrogation is received and the answer at 36 . becomes ~ES, ~ollowing o~f-page conrlector H, `~
the device 102 accesses its data base at 51 for . .
the identification and location data of the extension telephone 100 which was used to dial 911, and transmits this data at 52 to the i~terrogating deYice 116. At 53, as long as the extension 1-00 remains off-hook, the device : 102 checks at 57 to see if an acknowledging signal (ACX) has been received. If not, and as long as a second timer at 58 has not timed out, the device continues to output ID data at 52.
When ACK has been racei~ed, the YES at 57 stops WOg~/07439 PCr/US91/07688 ~07~7~:
the rep~tition of ID data. If ACK has not be~n received and a s~cond timer has tim d out (a YES at 58), the device 102 dials an alternate route or lFB line at 59 for the 911 call. This is an important feature of the device o~ the present invention. Prior art devices have no provision for selecting alternate routes if a connection at the dialed number cannot be accomplished. When the extension 100 has been hung up, the answer at 53 becomes N0, and control is returned to the PBX 110 at 54. When this occurs, the devire is reset, as at 55, "Return to Start." .
Thus, it will be seen by those skilled in the art that the CI device 102 not only allows the dialing o~ 911 for emergencies, but also allows the user to dial local and long distance calls as if a resident telephone were being used, This i8 an inherent operation o~ the CI
102.
After 911 has been dialed and the PBX 110, at 3~, has outdialed the number for the area PSAP 108, the sequence o~ events at the PSAP
108, as diagrammed in Figure 3, begins at 60 wlth the Personal Computer 120 ~enerating the legend "Wai~ing for next cal}," 62, on the CRT
screen of the operator's consol~ ~28. At 64~
an incoming call i~ received by CI 116, at 66. .:
At 68, CX 116 transmiks a polling signal ~o (interrogates) the calling CI, 102. At 70, the calling CI 102 responslvely returns the 61~ 1~
inXormation identi~ying the telQphone loo originating the callO At 72, the Dual Tone Modulatlng Frequency (DTMF) signals received ~rom the calling CI 102 are converted to ASCII
signals. The ASCII coded signals are ~ed at 74 to the Personal Computer 120, which generate~
an Alert Tone at 76. At 78, the computer 120 th~n writes on the CRT 126 screen and the printer 122, the number of the telephone 100 from which the incoming call originated.
The flow of the diagram next moves from 78 to 80 to 80' and 82, where th~ computer 120 writes "Decoding Input" to the screen 126 and printer 122 of the operator at the PSAP 108.
At 84, the area code, exchange ("NNX") t a~d individual telephone numb~r digits ("remaining digits") are assigned to variable storage names and locations in the memory o~ computer 120.
At 86, the computer 120 next writes "Decoded"
to the screen, 126/ and the printer, 122, ~ollowed by the number and location, 88, of the telephone 100 ma~ing th~ incoming call, together with the dake and time at which the : .
call is being made.
At 90, the PSAP operator a~swers the ~elephone 136 and, at 9Z, initiates the required actions to d~al with the inco~ing emergency call. As long as the calling telephone 100 xemains o~f-hook, the location .
and identi~ication in~ormation about that ~ ;.~ . :.., W092/07~39 PCT/V~91/07~8~
19 2~7~7~
telephone continues to be supplied to the devi~e 116 at the PSAP.
At tha conclusion of the situation, both parties hang up and conditions at the PSAP
re~urn ~o standby, 60' and 60 in the diagram~ -~rom the foregoing detailed description, it can be seen that a device capable of supplying the identifying number and location of telephones initiating a 911 emergency call, e~pecially PBX extension telephones, has been described. While features of a preferred embodiment have been mentioned in connection with the disclosure of the present invention, it will be underskood that no intent has been made to limit the invention to such dlsclosure, but rather the intention of such disclosure has been to cover all modi~ications and alternate constructions falling within the spirit and scope of the invention as defined in the appended claima.
Accordingly, this invention is limited only by the claims appended hereto, and their equivalents, when taken in combination with the complete de~cription contained herein.
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Claims (8)
1. A device, having a data base of information stored in an internal memory, for use as an adjunct to existing telephone switching and control devices, such switching and control devices being generically referred to as PBXs, and for responsively providing, to 911 and enhanced 911 emergency systems, selected extension identifying information which includes at least the number and location of an extension telephone of said PBX from which a call comprised of the three digits 911 originates, said device comprising:
sensing means for sensing an off-hook condition of any of a plurality of extension telephones of said PBX;
detecting means for detecting dialing signals from said extension telephones of said PBX, whether or not said extension telephones are in said off-hook condition;
selectable responding means for responding to the pressing of a selected single key of said extension telephones as a designated "Panic Button", alternate means of generating 911 emergency call, said alternate call generating means being functional without the need for taking said extension telephone off-hook;
identification means for determining whether or not said dialing signals from said extension telephones comprise an emergency 911 call, and whether or not said dialing signals were generated by said selected key of said extension telephones as an alternate, "Panic Button" method for dialing said emergency call;
dial tone processing means for detecting, generating, and suppressing at least one dial tone;
memory access means for selectively retrieving and transmitting selected items from said data base of information in response to a finding by said identification means that said call is a 911 emergency call, and appropriate externally generated interrogation signals;
PBX conformation means for causing said device to modify selected functions thereof in order to conform to selected functions of said PBX at which said device is installed, said selected functions of said PBX including a need for four digits to obtain an outside line and dial 911, and the inability of said PBX to reroute said 911 calls;
interface means for interfacing with computers, conventional telephones, telephone lines and circuits, other devices of the present invention, and radio-frequency type telephones; and automatic rerouting means for automatically dialing alternate destination telephone numbers and automatically selecting alternate telephone lines over which to transmit information in case of apparent failure of initially selected route.
sensing means for sensing an off-hook condition of any of a plurality of extension telephones of said PBX;
detecting means for detecting dialing signals from said extension telephones of said PBX, whether or not said extension telephones are in said off-hook condition;
selectable responding means for responding to the pressing of a selected single key of said extension telephones as a designated "Panic Button", alternate means of generating 911 emergency call, said alternate call generating means being functional without the need for taking said extension telephone off-hook;
identification means for determining whether or not said dialing signals from said extension telephones comprise an emergency 911 call, and whether or not said dialing signals were generated by said selected key of said extension telephones as an alternate, "Panic Button" method for dialing said emergency call;
dial tone processing means for detecting, generating, and suppressing at least one dial tone;
memory access means for selectively retrieving and transmitting selected items from said data base of information in response to a finding by said identification means that said call is a 911 emergency call, and appropriate externally generated interrogation signals;
PBX conformation means for causing said device to modify selected functions thereof in order to conform to selected functions of said PBX at which said device is installed, said selected functions of said PBX including a need for four digits to obtain an outside line and dial 911, and the inability of said PBX to reroute said 911 calls;
interface means for interfacing with computers, conventional telephones, telephone lines and circuits, other devices of the present invention, and radio-frequency type telephones; and automatic rerouting means for automatically dialing alternate destination telephone numbers and automatically selecting alternate telephone lines over which to transmit information in case of apparent failure of initially selected route.
2. An extension telephone identifying device for being retrofitted to existing PBXs or for being incorporated into future PBXs in circuit form, comprising:
detecting means for detecting signals originating from any of a plurality of extension telephones of said PBX;
identification means for determining whether or not said signals originating from said extension telephone comprise an emergency 911 call;
dial tone generating means for generating a dial tone;
means for suppressing a dial tone;
means for storing, retrieving, and transmitting selected items from a data base of information in response to a determination made by said identification means and in conjunction with an external signal; and interface means for interfacing with computers, telephones, telephone lines and circuits, and other devices of the present invention.
detecting means for detecting signals originating from any of a plurality of extension telephones of said PBX;
identification means for determining whether or not said signals originating from said extension telephone comprise an emergency 911 call;
dial tone generating means for generating a dial tone;
means for suppressing a dial tone;
means for storing, retrieving, and transmitting selected items from a data base of information in response to a determination made by said identification means and in conjunction with an external signal; and interface means for interfacing with computers, telephones, telephone lines and circuits, and other devices of the present invention.
3. A telephone call tracing device, comprising:
means for detecting a telephone call arriving at an input circuit of said tracing device;
means for discerning that said telephone call is an emergency call;
means for interrogating another device of the present invention installed at a remote location;
means for selectively storing, retrieving, and transmitting selected items from a data base of information; and interface means for interfacing with computers, telephones, telephone lines and circuits, and other devices of the present invention.
means for detecting a telephone call arriving at an input circuit of said tracing device;
means for discerning that said telephone call is an emergency call;
means for interrogating another device of the present invention installed at a remote location;
means for selectively storing, retrieving, and transmitting selected items from a data base of information; and interface means for interfacing with computers, telephones, telephone lines and circuits, and other devices of the present invention.
4. A device for detecting and controlling selected telephone calls, comprising:
means for detecting an incoming telephone call;
means for discerning that said incoming telephone call is an emergency call;
means for identifying the telephone originating the call;
means for generating control signals to a computer;
means for storing, retrieving, and transmitting selected items from a data base of information; and means for interfacing with computers, telephones, telephone lines and circuits, and other devices of the present invention.
means for detecting an incoming telephone call;
means for discerning that said incoming telephone call is an emergency call;
means for identifying the telephone originating the call;
means for generating control signals to a computer;
means for storing, retrieving, and transmitting selected items from a data base of information; and means for interfacing with computers, telephones, telephone lines and circuits, and other devices of the present invention.
5. A telephone number detecting, storing, and dialing device for use as an add-on to existing PBXs, comprising:
sensing means for sensing an off-hook condition of multiple extension telephones of a PBX;
dial tone generating means for selectively generating a dial tone;
suppression means for selectively suppressing a dial tone;
detecting means for detecting signals generated by said extension telephones;
identification means for determining whether or not said signals generated by said extension telephone comprise an emergency 911 call;
data handling means for storing, retrieving, and transmitting selected items from a data base of information; and interface means for interfacing with computers, telephone lines, devices, and circuits, and other devices of the present invention.
sensing means for sensing an off-hook condition of multiple extension telephones of a PBX;
dial tone generating means for selectively generating a dial tone;
suppression means for selectively suppressing a dial tone;
detecting means for detecting signals generated by said extension telephones;
identification means for determining whether or not said signals generated by said extension telephone comprise an emergency 911 call;
data handling means for storing, retrieving, and transmitting selected items from a data base of information; and interface means for interfacing with computers, telephone lines, devices, and circuits, and other devices of the present invention.
6. A telephone identification device for being installed at a telephone at a first location and for sending to a similar device installed at a telephone at a selected second location data which identifies said first telephone when said first telephone is used to generate a 911 emergency call, said device comprising:
sensing means for sensing an off hook condition of said first telephone;
detecting means for detecting signals generated by said first telephone;
signal identification means for determining whether or not said signals generated by said first telephone comprise an emergency 911 call;
dial tone means for selectively generating a dial tone;
dial tone suppression means for selectively suppressing a dial tone;
data processing means for storing, retrieving, and transmitting selected data items from a data base of information; and interfacing means for interfacing with computers, telephone lines, devices, and circuits, and other devices of the present invention.
sensing means for sensing an off hook condition of said first telephone;
detecting means for detecting signals generated by said first telephone;
signal identification means for determining whether or not said signals generated by said first telephone comprise an emergency 911 call;
dial tone means for selectively generating a dial tone;
dial tone suppression means for selectively suppressing a dial tone;
data processing means for storing, retrieving, and transmitting selected data items from a data base of information; and interfacing means for interfacing with computers, telephone lines, devices, and circuits, and other devices of the present invention.
7. A system of at least two devices, having electronic memories and data bases, for selectively supplying the identifying number and location of a calling extension telephone of a PBX via a first device of the present invention, installed at said PBX, to a second device installed in cooperative association with a selected called telephone, comprising the steps of:
detecting the dialing by a calling PBX
extension telephone of the digits 911;
in response to said detection of the dialing of the digits 911, the outdialing of a preselected number stored in said electronic memory;
the selecting of alternate process steps for PBXs requiring four digits for 911, and which do not reroute said 911 calls;
the detecting of a responsive interrogating signal from said second device;
upon detection of said interrogating signal, the accessing of said data base and the transmitting of selected items of data stored therein to said interrogating device; and the automatic selecting of an alternate telephone line and the automatic outdialing of an alternate telephone number in case of failure to detect aid interrogating signal.
detecting the dialing by a calling PBX
extension telephone of the digits 911;
in response to said detection of the dialing of the digits 911, the outdialing of a preselected number stored in said electronic memory;
the selecting of alternate process steps for PBXs requiring four digits for 911, and which do not reroute said 911 calls;
the detecting of a responsive interrogating signal from said second device;
upon detection of said interrogating signal, the accessing of said data base and the transmitting of selected items of data stored therein to said interrogating device; and the automatic selecting of an alternate telephone line and the automatic outdialing of an alternate telephone number in case of failure to detect aid interrogating signal.
8. A system of devices for use with existing PBXs for selectively supplying the identifying number and location of a calling extension telephone via one device of the present invention to a similar device installed in cooperative association with a selected called telephone, said devices having internal data bases and comprising:
sensing means for sensing an off-hook condition of multiple extension telephones of a PBX;
detecting means for detecting a cell being generated by said extension telephone whether or not said extension telephone is in said off-hook condition;
discernment means for discerning that said call being generated by said extension telephone is a 911 emergency call;
dial tone processing means for selectively detecting, generating, and suppressing a dial tone;
data processing means for storing, retrieving, and transmitting selected items from said data base of information;
digit identification means for determining whether said call being made by said telephone generating said call is an emergency 911 call or not; and interface means for interfacing with computers, telephone lines, devices, and circuits, and other devices of the present invention.
sensing means for sensing an off-hook condition of multiple extension telephones of a PBX;
detecting means for detecting a cell being generated by said extension telephone whether or not said extension telephone is in said off-hook condition;
discernment means for discerning that said call being generated by said extension telephone is a 911 emergency call;
dial tone processing means for selectively detecting, generating, and suppressing a dial tone;
data processing means for storing, retrieving, and transmitting selected items from said data base of information;
digit identification means for determining whether said call being made by said telephone generating said call is an emergency 911 call or not; and interface means for interfacing with computers, telephone lines, devices, and circuits, and other devices of the present invention.
Applications Claiming Priority (2)
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|---|---|---|---|
| US07/600,433 US5161180A (en) | 1990-10-19 | 1990-10-19 | Call interceptor for emergency systems |
| US600,433 | 1990-10-19 |
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|---|---|
| CA2070671A1 true CA2070671A1 (en) | 1992-04-20 |
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|---|---|---|---|
| CA002070671A Abandoned CA2070671A1 (en) | 1990-10-19 | 1991-10-16 | Call interceptor |
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| EP (1) | EP0506951A4 (en) |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3904830A (en) * | 1972-07-03 | 1975-09-09 | Mek Tronix Lab | Call tracing and identification system |
| US3967073A (en) * | 1975-01-09 | 1976-06-29 | Bell Telephone Laboratories, Incorporated | PBX automatic number identification system |
| US4578540A (en) * | 1982-12-20 | 1986-03-25 | At&T Bell Laboratories | Telecommunications systems |
| US4839917A (en) * | 1987-10-29 | 1989-06-13 | Oliver Stewart W | Universal line status monitoring and response system |
| US4893325A (en) * | 1988-09-23 | 1990-01-09 | Rockwell International Corporation | Integrated public safety answering point system |
-
1990
- 1990-10-19 US US07/600,433 patent/US5161180A/en not_active Expired - Fee Related
-
1991
- 1991-10-16 JP JP4500740A patent/JPH05504877A/en active Pending
- 1991-10-16 EP EP19920902506 patent/EP0506951A4/en not_active Withdrawn
- 1991-10-16 CA CA002070671A patent/CA2070671A1/en not_active Abandoned
- 1991-10-16 WO PCT/US1991/007688 patent/WO1992007439A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0506951A4 (en) | 1993-12-08 |
| EP0506951A1 (en) | 1992-10-07 |
| JPH05504877A (en) | 1993-07-22 |
| US5161180A (en) | 1992-11-03 |
| WO1992007439A1 (en) | 1992-04-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |