(12) Ulllted States Patent
`Spadaro et a].
`
`(10) Patent N0.:
`(45) Date of Patent:
`
`US 7,505,406 B1
`Mar. 17, 2009
`
`US007505406B1
`
`(54) PUBLIC TELEPHONE CONTROL WITH
`VOICE OVER INTERNET PROTOCOL
`TRANSMISSION
`
`(75) Inventors: Thomas R. Spadaro, Burlington, NJ
`g’lafi?fl
`hglarhhorns NJNJ
`;
`re rlc
`.
`1 er, 00 ees,
`(US); William J. Salibrici, Jobstown, NJ
`(US); Amr E. AbdelWahab, Deptford,
`N J (Us)
`
`3/1974 Hoven
`3,798,382 A
`5/1974 Conerly
`3,813,498 A
`8/1974 Caithamer et a1.
`3,829,617 A
`3,851,121 A 11/1974 Marvin
`3,864,519 A
`2/1975 Owen
`3,952,160 A
`4/1976 Pasternack et a1.
`
`(Continued)
`
`(73) Assignee: Evercom Systems, Inc., Dallas, TX
`(US)
`
`FOREIGN PATENT DOCUMENTS
`0185365 A1
`6/1986
`
`EP
`
`( * ) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 769 days.
`
`(21) Appl. No.2 09/905,014
`
`_
`(22) Flled:
`
`Jul- 131 2001
`
`(51) Int. Cl.
`H04] 1/16
`(2006.01)
`H04] 3/14
`(2006.01)
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`_
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`(Continued)
`
`.
`
`.
`
`1355;‘
`(74) Attorney Agent or FirmiFenwick & West LLP
`’
`’
`
`(57)
`
`ABSTRACT
`
`Controlled public telephone communication systems
`includes a plurality of telephones at a given site, a program
`mable control computer for switching, accessing, routing,
`timing, billing, and the control of the telephones at the site and
`a Voice over Internet Protocol (VolP) network connecting the
`telephones to an off site public switched telephone network.
`The programming of the control computer is distributed to
`remote locations over the VoIP network. A data exchange
`network interconnects other sites with the telephone commu
`n1ca1t{1ons system being 1ntegrated1nto the data exchange net
`Wor ~
`
`17 Claims, 5 Drawing Sheets
`
`INMATE
`TELEPHONES
`10
`
`SWITCHING
`
`CHECK PIN
`
`/ 22
`20
`/
`
`HOUT'NG
`
`7 s0
`28
`/
`THREE WAY
`CALL DETECT
`
`16
`__ \
`E PSTN
`
`18
`
`NETWORK
`
`BILLING
`/
`24
`
`o
`|
`|
`l
`|
`|
`|
`|
`|
`l
`26 nmmm?
`/
`(:1
`“1
`VOICE OVER ——
`lP GATEWAY
`
`12
`
`GTL 1004
`IPR of U.S. Pat. No. 7,529,357
`
`

`

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`

`US 7,505,406 B1
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`
`* cited by examiner
`
`

`

`US. Patent
`
`Mar. 17, 2009
`
`Sheet 1 of5
`
`US 7,505,406 B1
`
`FIG. 1
`
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`

`US. Patent
`
`Mar. 17, 2009
`
`Sheet 2 of5
`
`US 7,505,406 B1
`
`FIG. 3
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`U.S. Patent
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`Mar. 17, 2009
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`US 7,505,406 B1
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`US. Patent
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`Mar. 17, 2009
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`Sheet 4 of5
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`US 7,505,406 B1
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`U.S. Patent
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`Mar. 17, 2009
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`Sheet 5 of 5
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`US 7,505,406 B1
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`

`US 7,505,406 B1
`
`2
`of the telephones. The telephones are selectively connected to
`an off site switched telephone network over a Voice over
`Internet Protocol network.
`Further in accordance with the invention the programming
`for the computer is not all performed by the computer at the
`site. The system of the present invention distributes the pro
`cessing to remote locations over an Intranet or Internet net
`work. In accordance with the invention the distribution of the
`data processing to remote locations is integrated with the
`distribution of telephony signals over the Voice over Internet
`Protocol network.
`Further in accordance with the invention, the processing of
`three way call detection is movedbeyond the VoIP network so
`that signal loss or degradation by VoIP does not interfere with
`three way call detection.
`The foregoing and other objects, features and advantages
`of the invention will be better understood from the following
`more detailed description and dependent claims.
`
`20
`
`SHORT DESCRIPTION OF THE DRAWINGS
`
`1
`PUBLIC TELEPHONE CONTROL WITH
`VOICE OVER INTERNET PROTOCOL
`TRANSMISSION
`
`FIELD OF THE INVENTION
`
`This invention relates to the control of public telephones at
`a given site and the processing of voice telephone calls with
`the calls being routed over Voice over Internet Protocol net
`works.
`
`BACKGROUND OF THE INVENTION
`
`With typical coin operated public telephones a caller
`manually dials appropriate information over transmission
`means, such as local wire loops connected to a computing and
`switching means called a “central of?ce switch,” which ?rst
`collects the dialed caller information, processes the call, and
`controls the switching, accessing, and routing of caller infor
`mation over long-distance transmission means to other simi
`larly-arranged computing and switching means that are
`remotely located. In the past voice telephone calls were con
`nected to a human operator to provide assistance in account
`ing and billing for a call. Access over additional long-distance
`transmission means was provided to a last computing and
`switching means connected to the local loop of a destination
`telephone terminal instrument and various computing and
`switching means which record the call numbers and timing
`and further arrange the accounting and billing for the public
`telephones and calls.
`US. Pat. No. 4,935,956, Hellwarth, et al. describes a public
`phone service that permits and arranges long distance calls,
`the charges of which can be billed to either a credit account,
`the called party, or to a third party with a computer recording
`and accounting for the revenues collected from the telephone
`service. This is an example of a controlled public telephone
`system.
`Telephone instruments which are accessible to the public
`for placing telephone calls are used in locations which are
`accessible to persons who are not necessarily responsible for
`their use. Often, public telephones are located in areas where
`restrictions must be placed on their use. For example, in
`prisons limitations are placed on the destination telephones
`which may be called. In order to control the destination num
`bers it is necessary to detect attempted three-way calls. US.
`Pat. No. 5,768,355, Salibrici et al., shows a three-way call
`detection system which uses digital signal processing to iden
`tify a third party connection. The three-way call detection of
`this patent is used in the CommanderTM telephone system
`supplied by Science Dynamics Corporation. This is another
`example of a controlled public telephone system.
`Recently, voice over internet protocol (VoIP) has been used
`for transmitting packets of data representing voice telephone
`messages. A VoIP gateway permits VoIP sessions to be con
`ducted with called parties such as a called party having a PC
`connected to a Public Switching Transmission Network
`(PSTN) by a telephone line.
`It is an object of the present invention to use Voice over
`Internet Protocol networks to transmit information from a
`controlled public telephone system.
`
`SUMMARY OF THE INVENTION
`
`25
`
`30
`
`35
`
`40
`
`45
`
`50
`
`55
`
`60
`
`FIG. 1 shows a block diagram of a controlled public tele
`phone system of the present invention;
`FIG. 2 shows prior art public telephones at a single site;
`FIG. 3 shows prior art multiple site public telephone sys
`tems;
`FIG. 4 shows the ability of the invention to access software
`functions over a data network;
`FIG. 5 shows the same ability as FIG. 4 but shows that the
`VoIP and data network are the same;
`FIG. 6A depicts a prior art control computer; and
`FIG. 6B shows the modi?cations to the control computer
`necessary to provide VoIP and data network capability.
`
`DESCRIPTION OF THE PREFERRED
`EMBODIMENT
`
`FIG. 1 shows a controlled public telephone communication
`system including a plurality of public telephones 10 at a given
`site. The site may, for example, be a prison in which the use of
`the public telephones is monitored and controlled. Other sites
`for application of such control include hotels, airports, con
`vention centers, or any location both public and private which
`contains a plurality of public telephones . A programable com
`puter 12 at the site is provided for switching, accessing,
`routing, timing, billing and the control of the telephones 10 at
`the site. Telephones 10 are connected to computer 12 by wire
`lines 14. The computer 12 may be of the type shown in US.
`Pat. No. 4,935,956, Hellworth or of the commercially avail
`able type provided by Science Dynamics Corporation under
`their CommanderTM designation.
`Computer 12 has a modem which establishes a connection
`to a desired Public Switched Telephone Network (“PSTN”)
`16. The PSTN is any of those provided by AT&T, GTE, a
`Regional Bell Operating Company and others comprising
`multiple switching o?ices. As is known in the art, a Public
`Switched Telephone Network (“PSTN”) includes a hierarchy
`of telephony switching o?ices. Individual subscribers are
`accessed on “local loops” or individual telephone lines to a
`nearby telephone exchange called an “end of?ce” also called
`an “end telephony of?ce”. One or more end of?ces may be
`accessed to a “local central of?ce,” also called a “local central
`telephony of?ce” or accessed to a “toll o?ice.” An end o?ice
`may also function as a local central of?ce (e.g., in a remote
`area or rural area). Alternatively, the system can terminate in
`a Private Branch Exchange instead of the PSTN.
`
`In accordance with the present invention a controlled pub
`lic telephone communication system has a plurality of tele
`phones at a given site and a programmable computer for
`switching, accessing, routing, timing, billing, and the control
`
`65
`
`

`

`US 7,505,406 B1
`
`3
`In accordance with the present invention the telephones 10
`are selectively connected to the off site switch telephone
`network 16 over an Internet Protocol (IP) network 18 via
`Voice over Internet Protocol (VoIP) gateway 26. The Internet
`Protocol (IP) network may be a Wide Area Network (WAN)
`or a local area network (LAN). Computer 12 selectively con
`nects the telephones with the Voice over Internet Protocol
`gateway 26. The Internet Protocol (“IP”) is a routing protocol
`designed to route traf?c within a network or between net
`works. Voice-over-IP is a method for providing voice capa
`bilities over an IP network such as the Internet or an intranet.
`In such networks data packets are sent to and from commu
`nication sites to facilitate communication. In communication
`systems utiliZing a Voice over Internet Protocol (IP) protocol,
`these packets are commonly referred to as datagrams. In
`typical Voice over IP networks, each communication site
`sends datagrams to other communication sites. There are
`different approaches to sending datagrams.
`The control computer 12 supports a variety of applications,
`such as remote con?guration, management and back-up,
`bandwidth allocation and control, least cost routing, Voice
`over Internet Protocol (or Voice over IP), as well various
`telephony related applications. In certain preferred embodi
`ments, control signals per ITU recommendation H.323, and
`audio based media streams using RTP per Internet RFC1889
`are applied. Alternatively control signals could be applied
`using other protocols such as SIP per Internet RFC 2543.
`FIG. 1 shows that the computer 12 performs the function of
`switching, indicated at 20, routing, indicated at 22, and bill
`ing, indicated at 24. Typically a prison environment such as
`described in the example has rules and regulations regarding
`what each inmate is allowed for telephone usage. The tele
`phone user ?rst dials a calling card number and a PIN code
`which is checked at 28. A calling card number is associated
`with the PIN code. Control computers such as the Com
`manderTM have stored therein the restrictions on telephone
`usage associated with that PIN number. As an example, on
`Monday the inmate may be allowed to call his attorney or to
`call his mother. As part of the restriction on telephone usage
`the CommanderTM provides a three-way call detect system 30
`as described in the aforementioned Salibrici et al. patent. This
`is one of the restriction imposed by control computer 12.
`Voice data is processed by means of a vocoder (Voice
`Coder/Decoder). This process utiliZes one of several standard
`schemes such as ITU recommendation G.723.l, G.729, or
`G71 1 among others. VoIP Gateway 26 is provided to service
`and control Voice over IP (“VoIP”) communications. Various
`types of VoIP communications may be effectively managed
`and controlled in accordance with preferred embodiments of
`the present invention.
`FIG. 2 depicts the prior art in which four public telephones
`at a single site are connected through a commanderTM unit 32
`to a central of?ce 34. FIG. 3 depicts four sites 36, 38, 40 and
`42 each of which has a plurality of CommanderTM units
`connected through hubs 44 to a router 46. The router 46 routes
`calls to a server 48 which connects the calls to central of?ce
`34.
`In accordance with the present invention, lower cost and
`ef?ciency are obtained by operating systems such as shown in
`FIGS. 2 and 3 over Ethernet and Voice over Internet Protocol
`networks. For example, each prison in a state wide prison
`system has CommanderTM units such as shown in FIG. 3.
`There may be a thousand phones but all of the phones are
`connected through CommanderTM systems over Voice over
`Internet Protocol network. Often large administrative sys
`tems such as this have existing data networks which process
`and transmit e-mail and the like. Providing a control com
`
`20
`
`25
`
`30
`
`35
`
`40
`
`45
`
`50
`
`55
`
`60
`
`65
`
`4
`puter such as the CommanderTM with a VoIP gateway and
`Ethernet capability allows the public telephone systems at
`various sites to be integrated into the data network easily.
`FIG. 4 shows how the programming of control functions
`may be distributed to remote locations over the Ethernet
`network. In FIG. 4 the routing function 22, the billing func
`tion 24 and the PIN Checking 28 are distributed to a remote
`location or locations by the Ethernet network 50. As shown in
`FIG. 4, the network 50 is a local area network (LAN). How
`ever, these functions may also be distributed over a WAN. The
`distribution of these functions to remote locations has the
`advantage that the functions can be centraliZed with the func
`tions being performed at a central administration location.
`The distribution of a control function is accomplished with
`programming based on software architecture such as Bub
`bleLINK® and equipment with the ability to enable a seam
`less connection between traditional circuit-based networks
`and newer digital packet-based networks. Such equipment
`includes the Integrator C-2000® series of IP Telephony Gate
`ways and the Commander II Inmate Control phone system
`(also based on the Integrator C-2000® architecture). The
`control functions include a wide array of editable call control
`parameters, advanced call monitoring, real time call record
`ing and three way call fraud detection.
`FIG. 5 shows the integration of the VoIP and data networks.
`In this case the telephone communication is integrated into
`the data exchange network. FIGS. 4 and 5 also show that the
`three way call detection 30a is moved from the site, i.e. in the
`control computer 12 as indicted at 30, to a point beyond the
`VoIP network. VoIP transmission requires voice compression
`and packetiZing. These operations are lossy and detrimental
`to the ability to perform three way call detection. Therefore,
`three way call detection is performed at 3011 after the tele
`phony signals have been decompressed and depacketiZed by
`the VoIP gateway 26a.
`FIG. 6A depicts a prior art CommanderTM control com
`puter 13 which has software 50 for performing the functions
`of call processing, switching and control. It has station inter
`face hardware 52 which provides an interface with the tele
`phones 10. It has a