CA2236754A1 - Call back service for a regulatory restrictive area - Google Patents
Call back service for a regulatory restrictive area Download PDFInfo
- Publication number
- CA2236754A1 CA2236754A1 CA002236754A CA2236754A CA2236754A1 CA 2236754 A1 CA2236754 A1 CA 2236754A1 CA 002236754 A CA002236754 A CA 002236754A CA 2236754 A CA2236754 A CA 2236754A CA 2236754 A1 CA2236754 A1 CA 2236754A1
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- Canada
- Prior art keywords
- subscriber
- network
- call back
- country
- call
- 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.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/0016—Arrangements providing connection between exchanges
- H04Q3/0029—Provisions for intelligent networking
- H04Q3/0045—Provisions for intelligent networking involving hybrid, i.e. a mixture of public and private, or multi-vendor systems
-
- 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
- H04M3/48—Arrangements for recalling a calling subscriber when the wanted subscriber ceases to be busy
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/0016—Arrangements providing connection between exchanges
- H04Q3/0025—Provisions for signalling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/12—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13527—Indexing scheme relating to selecting arrangements in general and for multiplex systems protocols - X.25, TCAP etc.
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13533—Indexing scheme relating to selecting arrangements in general and for multiplex systems multivendor and hybrid, e.g. public/private, networks, inc. international
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13546—Intelligent Peripheral
Abstract
A telecommunications system (10) receives a call back request through a separately maintained computer network, such as an X.25 based computer network (130), and initiates the actual call back toward the requesting subscriber using its own Signaling System No. 7 (SS7) telecommunications network (140). If the call back request fails, an X.25 packet containing an error code is transmitted back to the originating subscriber over the separately maintained computer network. An X.25= TCAP converter (110) is used as an interface card to allow X.25 packets to communicate freely with TCAP based telecommunications network.
Description
CA 022367~4 1998-0~-04 CALL BACK SERVICE FOR A REGULATORY RESTRICTIVE AREA
BACKGROUND OF THE INVENTION
Technical Field of the Invention The present invention relates to a call back subscriber feature in a telecommunications network and, in particular, to the use of an X 25/TCAP protocol converter for exch~nging Signaling System No. 7 feature information between two telecommunications networks using data packet tr~n~mi.csions. In particular, theexchanged feature il-ro~ aLion comprises a call back request initiated at a first network, o ~.~".~,ll;lled as a data packet, and acted upon at a second network to initiate a call back from the second network to the first network.
Description of Related Art The following prior art is considered pertinent to the present invention. In WO
93/15583 (published 5 August 1993), disclosure is made of the interconnection of two 1 5 private networks (each implemented using a PBX) through not only a public network but also through another network such as an X.25 network. The public network is used to carry calls between the PBX's and the X.25 network is used to carry signaling messages between the PBX's in order to implement calling services. In U.S. Patent No. 4,166,929 (dated 4 September 1979), disclosure is made of an automatic callback arrangement for use in connection with inter-office calls. Responsive to a busy condition, the switch serving the called subscriber monitors line status and when determined to be idle, callback i~ aLion is returned from the called subscriber switch to a switch serving the originally calling subscriber. A call back is then initiated from the calling subscriber switch. In I:BM Technical Disclosure Bulletin vol. 35, no. 3, 2 5 pages 434-436 (dated August 1992), disclosure is made of an approach for transparently connecting an SS7 network to an X.25 network. A gateway is provided between the networks to handle addressing and protocol transformation.
Developments and improvements in the telecommunications switching systems have allowed telecommunications subscribers to enjoy a vast number of high-levelspecial subscriber features such as Class Automatic Callback (CAC) and Class ~MEN0~D SHEE~
CA 022367~4 1998-0~-04 -la-Automatic Recall (CAR) provided by the Common Channel Signaling (CCS) Signaling System No. 7 (SS7) protocols. These subscriber features allow a first subscriberlocated in one switch to call back or recall a second subscriber located in another 5 switch. If the second subscriber is already busy, the telecommunications network monitors the busy line until it goes idle and then establishes a connection between the first and the second subscribers. With the introduction of such subscriber features, subscribers do not have to repeatedly dial their busy calling parties' numbers until a connection is established or even have to know the telephone number of the party the 10 subscriber has lastly spoke with. However, even though these subscriber features have overcome technical hurdles and allowed the first subscriber to merely enter a service code and wait for the network to call him back when the second subscriber goes idle, the features still cannot overcome politically placed telecommunications hurdles.
These hurdles or restrictions are usually placed by a local government for 15 political or religious reasons and do not allow Signaling System No. 7 (SS7) or Channel Associate (CAS) sign~ling on the outbound traffic if the calls are directed toward certain "undesirable'~ countries. Accordingly, these restrictions imply that outbound SS7 calls to selected countries are not allowed, and only incoming SS7 calls A~AENOEO SHEET
CA 022367~4 1998-0~-04 are accepted. Therefore, if a telecommunications subscriber residing within a politically restricted telecommunication network area wishes to make a restricted outgoing intern~tional call, he or she would have to first call another switch placed in an unrestricted third country and then either m~ml~lly or automatically relay that call 5 to the desired restricted dPstin~tion by having the third switch initiate a new call setup and transfer the call.
Therefore, it would be a desirable capability for a first teleco~ ications subscriber to place a call back request through a different network than the restricted SS7 telecol,l~,lulfications network and have the second telecol~ ications subscriber 0 call back the first subscriber through the SS7 teleco"ll"ullications network. Since only the outgoing calls are restricted toward certain countries, if the first subscriber can request the second subscriber to call back the first subscriber, the actual call back would constitute an incoming call for the restricted switch, and no restriction would bar this call setup.
It would also be another desirable capability for the same call back system to gain favorable intern~tional tariff charges by having a second subscriber residing in a favorable tariff country to call back a first subscriber residing in a less favorable tariff country. For example, since calling from Europe to the United States is always much more expensive than calling from the United States to Europe, if a first 2 o subscriber residing in Europe could order a call back request through an ubiquitous network and have a second subscriber residing in the United States call back the first subscriber through the SS7 telecollllllullications network, the actual call connection would be much less expensive for the first subscriber.
Accordingly, it is an enh~ncPn~nt and advantageous over the prior art because 2 5 there is no longer the need to physically place a call toward a third country before establishing a connection with the desired party.
SUMMARY OF THE INVENTION
In another aspect of the present invention provides a method and a~alalus for providing call back subscriber fealulcs ~ltili7ing two different communications 3 o networks.
CA 022367~4 l998-0~-04 In another aspect, the present invention provides a system for establishing a communications link between two subscribers located within two dirr. .~,n~ countries where certain outgoing calls are restricted.
In a still further aspect the present invention provides a method and al)pal~lus5 which allows a teleco~ lwlications subscriber conn~cted to a telecommunications network restricting selected outgoing i ~ -t~ onal calls to circumvent the restrictions by requesting a call back from the desired clestin~tion caller through an ubiquitous network and receiving an actual call back from that desired destin~tion caller as an incoming call through an SS7 telecolmllunications network. The call back request is 10 ordered through an Intelligent Pel;,~,h. .al (IP) and transported to the other side using X.25 protocols such as Tr~n~mi~ion Control Protocol / Internet Protocol (TCP/IP).
In a further aspect of the invention, the following X.25 messages in the tr~n~mi.csion protocol are converted to Transaction Capabilities Application Part (TCAP) or Intelligent Network Application Protocol (INAP) SS7 messages and 15 inputted into an Intelligent Network (IN) Service Control Point (SCP). The SCP
notifies one of its Service Switching Points (SSP) servicing the desired subscriber, and the notified SSP initi~tPs a call back toward the origin~ting subscriber and also rings the desired destin~tion subscriber. If the desired destin~tion subscriber is busy, the SCP gellelales a message toward the IP notifying the delay, and the line StdtUS of the 2 0 destin~tion subscriber is monitored until the line becomes idle. Once the line becomes idle, a call back setup is initiated from the SSP toward the origin~ting subscriber and the ~estin~tion subscriber is also alerted (ringed).
This capability allows subscribers conn~octed to a telec.)....~ .;cations network restricting outgoing il~t~ ional calls to still make a connection with subscribers 2 5 residing in restricted countries without making an intermediate telecommunications call toward a third country. Furthermore, this same capability allows subscribers residing in high tariff countries to gain favorable tariff charges by having subscribers residing in lower tariff countries to call back the requesting subscribers.
CA 022367~4 1998-0~-04 BRIEF DESCRIPTION OF THE DRAWINGS
A more complete underst~n~lin~ of the method and a~alal~ls of the present invention may be had by reference to the following Detailed Description when taken in conjunction with the accolllp~lying Drawings wherein:
FIGURE 1 is a block diagram illu~llalhlg an Intelligent Network (IN); and FIGURE 2 is a block diagram illustrating how an X.25 network interf~es with an SS7 telecommunications network in accordance with the te~ching.~ of the present inventlon.
DETAILED DESCRIPTION OF A PRESENTLY PREFERRED EXEMPLARY
FIG. l shows an Intelligent Network (IN) in which the present invention, as will be disclosed herein, may be implement~cl In a typical telecommunication network, there are virtually limitless local exchanges and other support computers interconnecte~l with each other to provide teleconllllullications services to telecommunications subscribers. These local exchange switches and computers are manufactured by di~lclll vendors and each may have its own protocols and specifications. Each computer, and each application program in the computer, mayrequire a dirr~lel" collllllunication access method and protocol (i.e., a standard convention for communicating intelligently) for a viable "conversation" to proceed.
2 o This sets very specific le~lui~ ls on either or both parties to the end user in a form that they can recognize and manipulate. This may also involve protocol conversion to accommodate an end user's format, code, and language syntax.
The above problems have led the Tntern~tional Org~ni7~tion for Standardization (ISO) to launch an intensive effort to develop a worldwide communication architecture standard that would allow dirrelelll systems to communicate openly and resulted in Reference Model for Open Systems Interconnection (OSI). However, it is not the intent of OSI either to be a basis for appraising the conformance of actual implement~tions, or to provide a sufficient level of details to define precisely the services and protocols or the interconnection3 0 architecture. Rather, OSI provides a conceptual and functional framework which CA 022367~4 1998-0~-04 allows users to work productively and independently on the development of standards for each layer of the Reference Model of OSI. Accordingly, each network has to develop its own set of detailed specifications co~ hlg to the OSI model to actually achieve conl~dlible telecommunications network. In the United States and 5 worldwide, the most widely accepted OSI stadndard for telecollllllullications colllnlullication has been Common Channel Sign~ling (CCS) and the most commonly used technology for implementing the CCS standard has been the Common Channel Signaling System No. 7 (SS7) protocols created by the ~ntern~tional Telephone &
Telephone Consultative Committee (CCITT). The CCITT is an UN treaty 10 org~ni~ion made up of the postal, telegraph and telephone authorities of member countries and its recommended protocol SS7 is rapidly becoming recognized as theinternational standard. This CCS ~i n~ling system, designed using the concepts of packet switching and tailored to COl~llll with the OSI model, has been developed for use with both national and intern~tional traffic, for local and long-distance networks, 15 for interexchange sign~ling, and for various types of channels, including both terrestrial and satellite channels. Furthermore, the introduction of a packet-switched network used to carry call-sign~ling messages makes other data-h~n-lling services possible as well. These services include the Class Automatic Callback (CAC) and Class Automatic Recall (CAR) features. According to the CAR feature, when a 2 o first subscriber calls a second subscriber, the first subscriber's own telephone number is Lla~ ed along with the second subscriber's number over the SS7 telecommunications n~Lwulk to the local exchange servicing the second subscriber.
The local exchange servicing the second subscriber extracts the first subscriber's telephone number from the received SS7 message and stores the number in its own 2 5 database. After the te. ,..i.~ion of the initial call, if the second subscriber wishes to recall the first subscriber, the second subscriber merely enters an al)plopliate service code. Upon receipt of the service code, the local exchange retrieves the stored first subscriber's telephone number from the ~l~t~b~e and initiates a call setup toward the first subscriber. Similarly, if the first subscriber has the CAC feature, every time the 3 o first subscriber makes an outgoing call, the destination telephone number is stored in a ~t~ha~e m~int~ined by the local exchange servicing the first subscriber. If the first CA 022367~4 1998-0~-04 WO 97tl6930 PCTtUS96tl7699 subscriber wishes to call back the second subscriber after the t~rmin~tion of the initial connection, the first subscriber again merely dials a service code. Upon receipt of the service code, the local exchange retrieves the stored outgoing telephone number and a new call setup is initiated. However, if the second subscriber is already busy when 5 a new call back or recall is initi~t~ the local exchange servicing the second subscriber queues the call and monitors the busy line until it becomes idle. Once the line becomes available, the local exchange sends a Transaction Capabilities Application Part (TCAP) message to the local exchange servicing the first subscriber notifying that the second subscriber is now available. The local exchange servicing the first 10 subscriber alerts (rings) the first subscriber back and also initiates a new call setup toward the second subscriber. Such advanced intelligent subscriber features are possible because advance application layer messages, such as ~lestin~tion line status and origin~ting party number, are capable of being co~llll-u--icated over the SS7 telecommunications network.
Moreover, with the developments of the above mentioned special subscriber features and other sophisticated telecommunications applications, the telecol...llul.ications industry has adopted the term "Intelligent Network (IN)" to denote a concept and architecture to provide vendor-independent and network-independent interfaces between the service logic and the tr~n~mi.csion and switching 20 systems of a multi-enterprise telecommunications network. The goals of the Intelligent Network (IN) are to centralize the control node h~nrlling the service execution within a teleco---lnunication network to provide rapid definition, testing and introduction of new services as well as modification of existing services. IN also provides greater flexibility in the design and development of new services in a multi-2 5 vendor environment with shorter lead times, and standard network interfaces.The basic concept behind IN is to move the intelligence out of each localexchange or Service Switching Point (SSP) 30 and centralize the services providing the intelligence in a Service Control Point (SCP) 70. By centralizing the special subscriber services in the SCP 70, a new service can be added in only one place and 3 o provided to all subscribers connlocted to the multiple SSPs 30. Accordingly, one SSP
30 serves multiple telecollllllullications subscribers or termin~l~, and one SCP 70 CA 022367~4 1998-0~-04 serves multiple SSPs or local switches. The int~ es between SSPs 30 and the SCP
70 are by links 60 utili7ing the SS7 Transaction Capabilities Application Part (TCAP) as the application layer protocol. More specifically, Intelligent Network Application Protocols (INAP) sits on top of the TCAP protocols to establish a control dialogue 5 between the SSPs 30 and the SCP 70.
Hardware resources required to execute IN services are grouped and located separately from the SSP 70 in an Intelligent Peripheral (IP) 90. The purpose of such separation is to allow multiple SSPs to share the same resources, to decrease processor load in the SSP 70 and the SCPs 30, and to provide common functionality to all IN
10 services. The resources located in the IP 90 typically include, but not limited to, audio ann ~ ~. .re~ qntc, speech synthesis, speech recognition, voice recognition, DTMF digit reception, audio conference bridges for confelc;ncillg, tone generators, storage of customer messages, modems, e-mail, fax, and op~ldlor resources. Accordingly, theIP 90 supports the ability for user interaction to allow collection of dialed digits or 15 spoken input from users, as well as provisions of cu~lo,l~i~d annol~nrçm~nt~ to users.
The interface between the SCP 70 and the IP 90 is a link 80 also lltili7ing the SS7 Transaction Capabilities Application Part (TCAP) as the application layer protocol.
The reason TCAP is used instead of ISDN is because there is no need for a voice channel between the SCP 70 and the IP 90. The SCP 70 merely instructs the IP 90 to 2 o pc;lrO~ a certain specific function toward a specific subscriber, and the actual voice connection for providing special anno..ncem~nt.c or for collecting user voice for recognition is done via links 50. Consequently, the interfaces btlw~tn the IP 90 and the SSP 30 via links 50 are through Integrated Service Digital Network (ISDN) User Part (ISUP) which has the capability to transport voice data. These interfaces allow 2 5 teleco. "~u. .i~.~tions subscribers 20 conn~cted to the SSPs 30 to hear and interact with resources located in the IP 90.
Even though the above mentioned IP/SS7 networking is desirable and sometimes m~n~l~tQry for real-time telecollllllullications switching services, connections between non-real-time com~ systems do not normally utilize the 3 o above SS7 telecollllllullication network since there is no need to transfer data between the two nodes in a real-time basis. Because of these lesser dem~n~ling timing CA 022367~4 1998-0~-04 requirements, different types of networks are used for connections of computer systems. An example of such a network is the X.25 based network.
The X.25 protocol is a CCITT recommen-l~tion that defines connections of t~rmin~l~ and computers to packet-switching nclwulks. Packet-switching networks route packets of data through a network to destin~tion nodes. Even though X.25 is a well-established packet-switching service traditionally used to connect remote t~ min~l~ to host systems, the X.25 network usually suffers from poor performance and is not acceptable for most real-time telecommunications networks. However, X.25 is well established, well understood, and acceptable for remote t~rmin~l~ or computer access and, most hllpoll~llly, almost every country has X.25 services. It is also quite easy to build private X.25 packet-switching networks by in~t~lling X.25 switching eqnirment on-site and conn~ctinp the sites with leased lines. Lastly, in most countries, the X.25 networks are privately m~int~in~ and there are usually no restrictions placed on the X.25 networks.
However, because of the previously mentioned timing requirements in a telecommunication switch and the incompatibility problem that exists between the two protocols, the SS7 telec~l.llllll.lications network and the X.25 based network have not been previously interfaced with each other to provide other advanced subscriber features.
2 o Accordingly, the present invention discloses a system whereby an ubiquitous computer network such as X.25 is combined with an SS7 telecommunications networkto provide call back subscriber features to a subscriber wanting to establish a connection from a politically restricted country. Computer networks such as Internet or Ethernet lltili7ing the X.25 nclwulk are already -widely available worldwide and, 2 5 thclcrolc, implem~nting the plcrcllcd embodiment of the present invention using such X.25 networks is cheap and requires little modifications to the çxi~ting networks.
Furthermore, since call back requests are ordered through an ubiquitous computernetwork, no strict timing and reliability requirements are required, and only a proper interface is needed to allow the colllpul~,l network to communicate with the SS73 o telecommunications network.
CA 022367~4 1998-0~-04 Therefore, FIG. 2 ,~)lesf"ll~ a logical diagram showing how an X.25 network interfaces with an SS7 telecommunications network according to the plerellcd embodiment of the present invention. When a subscriber 20B residing within a country that has restrictions on all outgoing i,~f...illional calls toward Country A
wishes to establish a telecolll~llul~ication col~"e.;lion with a subscriber 20A residing in Country A, the subscriber 20B requests a call back by dialing an access number to connect to an IP 90. This access number could be a toll free number (e.g., 800 number in the U.S.). A local switch SSP 30B servicing the subscriber 20B analyzes the received number and d~te. ~Il;llf'S that it needs to be routed to an Intelligent Peripheral 1 0 (IP) 90 vis TCAP messages. After the call is routed to an Intelligent Peripheral (IP) by an ori~in~ting SSP 30B, the subscriber 20B receives a voice prompt for the Calling Line Id (CLI) or account number for validation and the desired ~lestin~tion number from the IP 90. The subscriber 20B inputs the required subscriber data using Dual Tone Multi Frequency (DTMF) signals. Altern~tively, the subscriber 20B can input1 5 the data using his or her voice, and the IP 90 detects the subscriber data using a voice recognition module. After receiving the validation data and the 11f ~tin~tion number, the IP 90 performs a validation process and acco,.li"gly formats X.25 packets carrying the clçstin~tion number, origin~tin~ number, call ID and time clock to be transported to a Converter 110 located in Country A via a X.25 link 130. This link could be any 2 0 reliable computer network including TntPrnet, Ethernet, or other LAN connections.
Once the X.25 <=> TCAP Converter 110 receives the X.25 packets from the IP 90, the Converter 110 extracts the n~ces~ry information from the X.25 packet messages and converts the information into a TCAP message. After the conversion, the Converter 110 Ll~ls,,,il~ the TCAP Protocol Update Message to the SCP 70 with the call setup information via an SS7/TCAP link 120. Such a converter is needed because the SCP70 does not have the necessary interface to communicate directly with a col""~u"ication network running on a di~,~;"l protocol. Therefore, the Converter 110 functions as an interface card between the SCP 70 in Country A and the IP 90 in Country B.
3 0 After receiving the TCAP Protocol Update Messages from the Converter 110, the SCP 70 sends Initiate-Call-Attempt or equivalent SS7 messages toward the SSP
CA 022367~4 1998-0~-04 30A to instruct the SSP 30A to initiate a call back toward the subscriber 20B over the SS7 telecommunications network. This call setup is represented by a link 140 between the SSP 30A and the SSP 30B. Even though this call back to the subscriber 20B is in response to the subscriber 20B's previous call back request, as far as the 5 teleco~ l..ications network in Country B is conrern~.l it is an incoming call and no restriction check is placed on the connection. After the subscriber 20B is ringed and answered, an annol1ncern~nt is played to notify the subscriber 20B that a call back setup toward the subscriber 20A is being initiated. Concurrently, the SSP 30A
illiLi~Les another connection from the SSP 30A toward the subscriber 20A. When the lo subscriber 20A answers the phone, a voice connection is established between the subscriber 20A and 20B through the SS7 teleco,.~ ications link 30A. As far as the SSP 30B is conrçrn~l, when an int~rn~tional incoming call is received from the SSP
30A, the SSP 30B checks the incoming call ID and .e,~ules the call to the IP 90 if this incoming call is the call the IP 90 has originally requested through the X.25 network.
15 The IP 90 takes control over the call and connects the incoming call with thesubscriber 20B, effectively connecting the subscriber 20A with the subscriber 20B.
Alternatively, the IP 90 can release the call control over to the SSP 30B after processing the ~flmini~trative tasks, such as charging, and allow the SSP 30B toconnect the incoming call with the subscriber 20B. This alternative implementation 20 elimin~tes the need for the IP 90 to utili~ two voice channels, one for the incoming call and the other for the subscriber 20B, to establish the connection.
If the subscriber 20A is busy when the SSP 30A tries to execute the set up as a result of the InitialCallAttempt message, the SSP 30A places a monitor on the subscriber 20A's line and the line status is continuously ch~c~ l Effectively, the SSP
25 30A performs functions equivalent to the previously mentioned Class AutomaticCallback (CAC) and Class Automatic Recall (CAR) features by queuing the request and ordering another call set up as soon as the monitored line is freed. However, according to the preferred embodiment of the present invention, once the monitored subscriber line goes idle, instead of generating a TCAP message toward the other30 exchange to allow the other exchange to reinitiate a new call setup, the SSP 30A
monitoring the line status initi~tes a call back toward the subscriber 20B directly. This CA 022367~4 1998-0~-04 is to make sure that the SSP 30A is the switch that is generating an incoming call into Country B.
If the subscriber 20A is not freed within a predetermined time period, the SCP
70 sends a TCAP message to the Converter 110 with an appropriate message code.
5 Consequently, the Converter 110 encodes the message into an X.25 packet and transmits it over the X.25 network to the IP 90 in Country B. The IP 90 extracts the necessary information from the X.25 packet and accordingly plays an announcementnotifying the subscriber 20B that the destination subscriber could not be reached and the call back request has failed. Moreover, if there is hardware congestion or physical 10 failure in the system, other error codes are sent back to the subscriber 20B to notify of the result.
Therefore, if the call back request has failed, no SS7 telecommunications link has ever been established between the subscriber 20B and the subscriber 20A. Therequest for the call back and the notice of the failure are all communicated over the 15 X.25 based computer network, much like an e-mail, and the subscriber 20B has incurred no telephone service charges.
Although a preferred embodiment of the method and apparatus of the present invention has been illustrated in the accompanying Drawings and described in theforegoing Detailed Description, it will be understood that the invention is not limited 20 to the embodiment disclosed, but is capable of numerous rearrangements, modifications and substitutions without departing from the scope of the invention as set forth and defined by the following claims.
AMEflDED SHEEI
BACKGROUND OF THE INVENTION
Technical Field of the Invention The present invention relates to a call back subscriber feature in a telecommunications network and, in particular, to the use of an X 25/TCAP protocol converter for exch~nging Signaling System No. 7 feature information between two telecommunications networks using data packet tr~n~mi.csions. In particular, theexchanged feature il-ro~ aLion comprises a call back request initiated at a first network, o ~.~".~,ll;lled as a data packet, and acted upon at a second network to initiate a call back from the second network to the first network.
Description of Related Art The following prior art is considered pertinent to the present invention. In WO
93/15583 (published 5 August 1993), disclosure is made of the interconnection of two 1 5 private networks (each implemented using a PBX) through not only a public network but also through another network such as an X.25 network. The public network is used to carry calls between the PBX's and the X.25 network is used to carry signaling messages between the PBX's in order to implement calling services. In U.S. Patent No. 4,166,929 (dated 4 September 1979), disclosure is made of an automatic callback arrangement for use in connection with inter-office calls. Responsive to a busy condition, the switch serving the called subscriber monitors line status and when determined to be idle, callback i~ aLion is returned from the called subscriber switch to a switch serving the originally calling subscriber. A call back is then initiated from the calling subscriber switch. In I:BM Technical Disclosure Bulletin vol. 35, no. 3, 2 5 pages 434-436 (dated August 1992), disclosure is made of an approach for transparently connecting an SS7 network to an X.25 network. A gateway is provided between the networks to handle addressing and protocol transformation.
Developments and improvements in the telecommunications switching systems have allowed telecommunications subscribers to enjoy a vast number of high-levelspecial subscriber features such as Class Automatic Callback (CAC) and Class ~MEN0~D SHEE~
CA 022367~4 1998-0~-04 -la-Automatic Recall (CAR) provided by the Common Channel Signaling (CCS) Signaling System No. 7 (SS7) protocols. These subscriber features allow a first subscriberlocated in one switch to call back or recall a second subscriber located in another 5 switch. If the second subscriber is already busy, the telecommunications network monitors the busy line until it goes idle and then establishes a connection between the first and the second subscribers. With the introduction of such subscriber features, subscribers do not have to repeatedly dial their busy calling parties' numbers until a connection is established or even have to know the telephone number of the party the 10 subscriber has lastly spoke with. However, even though these subscriber features have overcome technical hurdles and allowed the first subscriber to merely enter a service code and wait for the network to call him back when the second subscriber goes idle, the features still cannot overcome politically placed telecommunications hurdles.
These hurdles or restrictions are usually placed by a local government for 15 political or religious reasons and do not allow Signaling System No. 7 (SS7) or Channel Associate (CAS) sign~ling on the outbound traffic if the calls are directed toward certain "undesirable'~ countries. Accordingly, these restrictions imply that outbound SS7 calls to selected countries are not allowed, and only incoming SS7 calls A~AENOEO SHEET
CA 022367~4 1998-0~-04 are accepted. Therefore, if a telecommunications subscriber residing within a politically restricted telecommunication network area wishes to make a restricted outgoing intern~tional call, he or she would have to first call another switch placed in an unrestricted third country and then either m~ml~lly or automatically relay that call 5 to the desired restricted dPstin~tion by having the third switch initiate a new call setup and transfer the call.
Therefore, it would be a desirable capability for a first teleco~ ications subscriber to place a call back request through a different network than the restricted SS7 telecol,l~,lulfications network and have the second telecol~ ications subscriber 0 call back the first subscriber through the SS7 teleco"ll"ullications network. Since only the outgoing calls are restricted toward certain countries, if the first subscriber can request the second subscriber to call back the first subscriber, the actual call back would constitute an incoming call for the restricted switch, and no restriction would bar this call setup.
It would also be another desirable capability for the same call back system to gain favorable intern~tional tariff charges by having a second subscriber residing in a favorable tariff country to call back a first subscriber residing in a less favorable tariff country. For example, since calling from Europe to the United States is always much more expensive than calling from the United States to Europe, if a first 2 o subscriber residing in Europe could order a call back request through an ubiquitous network and have a second subscriber residing in the United States call back the first subscriber through the SS7 telecollllllullications network, the actual call connection would be much less expensive for the first subscriber.
Accordingly, it is an enh~ncPn~nt and advantageous over the prior art because 2 5 there is no longer the need to physically place a call toward a third country before establishing a connection with the desired party.
SUMMARY OF THE INVENTION
In another aspect of the present invention provides a method and a~alalus for providing call back subscriber fealulcs ~ltili7ing two different communications 3 o networks.
CA 022367~4 l998-0~-04 In another aspect, the present invention provides a system for establishing a communications link between two subscribers located within two dirr. .~,n~ countries where certain outgoing calls are restricted.
In a still further aspect the present invention provides a method and al)pal~lus5 which allows a teleco~ lwlications subscriber conn~cted to a telecommunications network restricting selected outgoing i ~ -t~ onal calls to circumvent the restrictions by requesting a call back from the desired clestin~tion caller through an ubiquitous network and receiving an actual call back from that desired destin~tion caller as an incoming call through an SS7 telecolmllunications network. The call back request is 10 ordered through an Intelligent Pel;,~,h. .al (IP) and transported to the other side using X.25 protocols such as Tr~n~mi~ion Control Protocol / Internet Protocol (TCP/IP).
In a further aspect of the invention, the following X.25 messages in the tr~n~mi.csion protocol are converted to Transaction Capabilities Application Part (TCAP) or Intelligent Network Application Protocol (INAP) SS7 messages and 15 inputted into an Intelligent Network (IN) Service Control Point (SCP). The SCP
notifies one of its Service Switching Points (SSP) servicing the desired subscriber, and the notified SSP initi~tPs a call back toward the origin~ting subscriber and also rings the desired destin~tion subscriber. If the desired destin~tion subscriber is busy, the SCP gellelales a message toward the IP notifying the delay, and the line StdtUS of the 2 0 destin~tion subscriber is monitored until the line becomes idle. Once the line becomes idle, a call back setup is initiated from the SSP toward the origin~ting subscriber and the ~estin~tion subscriber is also alerted (ringed).
This capability allows subscribers conn~octed to a telec.)....~ .;cations network restricting outgoing il~t~ ional calls to still make a connection with subscribers 2 5 residing in restricted countries without making an intermediate telecommunications call toward a third country. Furthermore, this same capability allows subscribers residing in high tariff countries to gain favorable tariff charges by having subscribers residing in lower tariff countries to call back the requesting subscribers.
CA 022367~4 1998-0~-04 BRIEF DESCRIPTION OF THE DRAWINGS
A more complete underst~n~lin~ of the method and a~alal~ls of the present invention may be had by reference to the following Detailed Description when taken in conjunction with the accolllp~lying Drawings wherein:
FIGURE 1 is a block diagram illu~llalhlg an Intelligent Network (IN); and FIGURE 2 is a block diagram illustrating how an X.25 network interf~es with an SS7 telecommunications network in accordance with the te~ching.~ of the present inventlon.
DETAILED DESCRIPTION OF A PRESENTLY PREFERRED EXEMPLARY
FIG. l shows an Intelligent Network (IN) in which the present invention, as will be disclosed herein, may be implement~cl In a typical telecommunication network, there are virtually limitless local exchanges and other support computers interconnecte~l with each other to provide teleconllllullications services to telecommunications subscribers. These local exchange switches and computers are manufactured by di~lclll vendors and each may have its own protocols and specifications. Each computer, and each application program in the computer, mayrequire a dirr~lel" collllllunication access method and protocol (i.e., a standard convention for communicating intelligently) for a viable "conversation" to proceed.
2 o This sets very specific le~lui~ ls on either or both parties to the end user in a form that they can recognize and manipulate. This may also involve protocol conversion to accommodate an end user's format, code, and language syntax.
The above problems have led the Tntern~tional Org~ni7~tion for Standardization (ISO) to launch an intensive effort to develop a worldwide communication architecture standard that would allow dirrelelll systems to communicate openly and resulted in Reference Model for Open Systems Interconnection (OSI). However, it is not the intent of OSI either to be a basis for appraising the conformance of actual implement~tions, or to provide a sufficient level of details to define precisely the services and protocols or the interconnection3 0 architecture. Rather, OSI provides a conceptual and functional framework which CA 022367~4 1998-0~-04 allows users to work productively and independently on the development of standards for each layer of the Reference Model of OSI. Accordingly, each network has to develop its own set of detailed specifications co~ hlg to the OSI model to actually achieve conl~dlible telecommunications network. In the United States and 5 worldwide, the most widely accepted OSI stadndard for telecollllllullications colllnlullication has been Common Channel Sign~ling (CCS) and the most commonly used technology for implementing the CCS standard has been the Common Channel Signaling System No. 7 (SS7) protocols created by the ~ntern~tional Telephone &
Telephone Consultative Committee (CCITT). The CCITT is an UN treaty 10 org~ni~ion made up of the postal, telegraph and telephone authorities of member countries and its recommended protocol SS7 is rapidly becoming recognized as theinternational standard. This CCS ~i n~ling system, designed using the concepts of packet switching and tailored to COl~llll with the OSI model, has been developed for use with both national and intern~tional traffic, for local and long-distance networks, 15 for interexchange sign~ling, and for various types of channels, including both terrestrial and satellite channels. Furthermore, the introduction of a packet-switched network used to carry call-sign~ling messages makes other data-h~n-lling services possible as well. These services include the Class Automatic Callback (CAC) and Class Automatic Recall (CAR) features. According to the CAR feature, when a 2 o first subscriber calls a second subscriber, the first subscriber's own telephone number is Lla~ ed along with the second subscriber's number over the SS7 telecommunications n~Lwulk to the local exchange servicing the second subscriber.
The local exchange servicing the second subscriber extracts the first subscriber's telephone number from the received SS7 message and stores the number in its own 2 5 database. After the te. ,..i.~ion of the initial call, if the second subscriber wishes to recall the first subscriber, the second subscriber merely enters an al)plopliate service code. Upon receipt of the service code, the local exchange retrieves the stored first subscriber's telephone number from the ~l~t~b~e and initiates a call setup toward the first subscriber. Similarly, if the first subscriber has the CAC feature, every time the 3 o first subscriber makes an outgoing call, the destination telephone number is stored in a ~t~ha~e m~int~ined by the local exchange servicing the first subscriber. If the first CA 022367~4 1998-0~-04 WO 97tl6930 PCTtUS96tl7699 subscriber wishes to call back the second subscriber after the t~rmin~tion of the initial connection, the first subscriber again merely dials a service code. Upon receipt of the service code, the local exchange retrieves the stored outgoing telephone number and a new call setup is initiated. However, if the second subscriber is already busy when 5 a new call back or recall is initi~t~ the local exchange servicing the second subscriber queues the call and monitors the busy line until it becomes idle. Once the line becomes available, the local exchange sends a Transaction Capabilities Application Part (TCAP) message to the local exchange servicing the first subscriber notifying that the second subscriber is now available. The local exchange servicing the first 10 subscriber alerts (rings) the first subscriber back and also initiates a new call setup toward the second subscriber. Such advanced intelligent subscriber features are possible because advance application layer messages, such as ~lestin~tion line status and origin~ting party number, are capable of being co~llll-u--icated over the SS7 telecommunications network.
Moreover, with the developments of the above mentioned special subscriber features and other sophisticated telecommunications applications, the telecol...llul.ications industry has adopted the term "Intelligent Network (IN)" to denote a concept and architecture to provide vendor-independent and network-independent interfaces between the service logic and the tr~n~mi.csion and switching 20 systems of a multi-enterprise telecommunications network. The goals of the Intelligent Network (IN) are to centralize the control node h~nrlling the service execution within a teleco---lnunication network to provide rapid definition, testing and introduction of new services as well as modification of existing services. IN also provides greater flexibility in the design and development of new services in a multi-2 5 vendor environment with shorter lead times, and standard network interfaces.The basic concept behind IN is to move the intelligence out of each localexchange or Service Switching Point (SSP) 30 and centralize the services providing the intelligence in a Service Control Point (SCP) 70. By centralizing the special subscriber services in the SCP 70, a new service can be added in only one place and 3 o provided to all subscribers connlocted to the multiple SSPs 30. Accordingly, one SSP
30 serves multiple telecollllllullications subscribers or termin~l~, and one SCP 70 CA 022367~4 1998-0~-04 serves multiple SSPs or local switches. The int~ es between SSPs 30 and the SCP
70 are by links 60 utili7ing the SS7 Transaction Capabilities Application Part (TCAP) as the application layer protocol. More specifically, Intelligent Network Application Protocols (INAP) sits on top of the TCAP protocols to establish a control dialogue 5 between the SSPs 30 and the SCP 70.
Hardware resources required to execute IN services are grouped and located separately from the SSP 70 in an Intelligent Peripheral (IP) 90. The purpose of such separation is to allow multiple SSPs to share the same resources, to decrease processor load in the SSP 70 and the SCPs 30, and to provide common functionality to all IN
10 services. The resources located in the IP 90 typically include, but not limited to, audio ann ~ ~. .re~ qntc, speech synthesis, speech recognition, voice recognition, DTMF digit reception, audio conference bridges for confelc;ncillg, tone generators, storage of customer messages, modems, e-mail, fax, and op~ldlor resources. Accordingly, theIP 90 supports the ability for user interaction to allow collection of dialed digits or 15 spoken input from users, as well as provisions of cu~lo,l~i~d annol~nrçm~nt~ to users.
The interface between the SCP 70 and the IP 90 is a link 80 also lltili7ing the SS7 Transaction Capabilities Application Part (TCAP) as the application layer protocol.
The reason TCAP is used instead of ISDN is because there is no need for a voice channel between the SCP 70 and the IP 90. The SCP 70 merely instructs the IP 90 to 2 o pc;lrO~ a certain specific function toward a specific subscriber, and the actual voice connection for providing special anno..ncem~nt.c or for collecting user voice for recognition is done via links 50. Consequently, the interfaces btlw~tn the IP 90 and the SSP 30 via links 50 are through Integrated Service Digital Network (ISDN) User Part (ISUP) which has the capability to transport voice data. These interfaces allow 2 5 teleco. "~u. .i~.~tions subscribers 20 conn~cted to the SSPs 30 to hear and interact with resources located in the IP 90.
Even though the above mentioned IP/SS7 networking is desirable and sometimes m~n~l~tQry for real-time telecollllllullications switching services, connections between non-real-time com~ systems do not normally utilize the 3 o above SS7 telecollllllullication network since there is no need to transfer data between the two nodes in a real-time basis. Because of these lesser dem~n~ling timing CA 022367~4 1998-0~-04 requirements, different types of networks are used for connections of computer systems. An example of such a network is the X.25 based network.
The X.25 protocol is a CCITT recommen-l~tion that defines connections of t~rmin~l~ and computers to packet-switching nclwulks. Packet-switching networks route packets of data through a network to destin~tion nodes. Even though X.25 is a well-established packet-switching service traditionally used to connect remote t~ min~l~ to host systems, the X.25 network usually suffers from poor performance and is not acceptable for most real-time telecommunications networks. However, X.25 is well established, well understood, and acceptable for remote t~rmin~l~ or computer access and, most hllpoll~llly, almost every country has X.25 services. It is also quite easy to build private X.25 packet-switching networks by in~t~lling X.25 switching eqnirment on-site and conn~ctinp the sites with leased lines. Lastly, in most countries, the X.25 networks are privately m~int~in~ and there are usually no restrictions placed on the X.25 networks.
However, because of the previously mentioned timing requirements in a telecommunication switch and the incompatibility problem that exists between the two protocols, the SS7 telec~l.llllll.lications network and the X.25 based network have not been previously interfaced with each other to provide other advanced subscriber features.
2 o Accordingly, the present invention discloses a system whereby an ubiquitous computer network such as X.25 is combined with an SS7 telecommunications networkto provide call back subscriber features to a subscriber wanting to establish a connection from a politically restricted country. Computer networks such as Internet or Ethernet lltili7ing the X.25 nclwulk are already -widely available worldwide and, 2 5 thclcrolc, implem~nting the plcrcllcd embodiment of the present invention using such X.25 networks is cheap and requires little modifications to the çxi~ting networks.
Furthermore, since call back requests are ordered through an ubiquitous computernetwork, no strict timing and reliability requirements are required, and only a proper interface is needed to allow the colllpul~,l network to communicate with the SS73 o telecommunications network.
CA 022367~4 1998-0~-04 Therefore, FIG. 2 ,~)lesf"ll~ a logical diagram showing how an X.25 network interfaces with an SS7 telecommunications network according to the plerellcd embodiment of the present invention. When a subscriber 20B residing within a country that has restrictions on all outgoing i,~f...illional calls toward Country A
wishes to establish a telecolll~llul~ication col~"e.;lion with a subscriber 20A residing in Country A, the subscriber 20B requests a call back by dialing an access number to connect to an IP 90. This access number could be a toll free number (e.g., 800 number in the U.S.). A local switch SSP 30B servicing the subscriber 20B analyzes the received number and d~te. ~Il;llf'S that it needs to be routed to an Intelligent Peripheral 1 0 (IP) 90 vis TCAP messages. After the call is routed to an Intelligent Peripheral (IP) by an ori~in~ting SSP 30B, the subscriber 20B receives a voice prompt for the Calling Line Id (CLI) or account number for validation and the desired ~lestin~tion number from the IP 90. The subscriber 20B inputs the required subscriber data using Dual Tone Multi Frequency (DTMF) signals. Altern~tively, the subscriber 20B can input1 5 the data using his or her voice, and the IP 90 detects the subscriber data using a voice recognition module. After receiving the validation data and the 11f ~tin~tion number, the IP 90 performs a validation process and acco,.li"gly formats X.25 packets carrying the clçstin~tion number, origin~tin~ number, call ID and time clock to be transported to a Converter 110 located in Country A via a X.25 link 130. This link could be any 2 0 reliable computer network including TntPrnet, Ethernet, or other LAN connections.
Once the X.25 <=> TCAP Converter 110 receives the X.25 packets from the IP 90, the Converter 110 extracts the n~ces~ry information from the X.25 packet messages and converts the information into a TCAP message. After the conversion, the Converter 110 Ll~ls,,,il~ the TCAP Protocol Update Message to the SCP 70 with the call setup information via an SS7/TCAP link 120. Such a converter is needed because the SCP70 does not have the necessary interface to communicate directly with a col""~u"ication network running on a di~,~;"l protocol. Therefore, the Converter 110 functions as an interface card between the SCP 70 in Country A and the IP 90 in Country B.
3 0 After receiving the TCAP Protocol Update Messages from the Converter 110, the SCP 70 sends Initiate-Call-Attempt or equivalent SS7 messages toward the SSP
CA 022367~4 1998-0~-04 30A to instruct the SSP 30A to initiate a call back toward the subscriber 20B over the SS7 telecommunications network. This call setup is represented by a link 140 between the SSP 30A and the SSP 30B. Even though this call back to the subscriber 20B is in response to the subscriber 20B's previous call back request, as far as the 5 teleco~ l..ications network in Country B is conrern~.l it is an incoming call and no restriction check is placed on the connection. After the subscriber 20B is ringed and answered, an annol1ncern~nt is played to notify the subscriber 20B that a call back setup toward the subscriber 20A is being initiated. Concurrently, the SSP 30A
illiLi~Les another connection from the SSP 30A toward the subscriber 20A. When the lo subscriber 20A answers the phone, a voice connection is established between the subscriber 20A and 20B through the SS7 teleco,.~ ications link 30A. As far as the SSP 30B is conrçrn~l, when an int~rn~tional incoming call is received from the SSP
30A, the SSP 30B checks the incoming call ID and .e,~ules the call to the IP 90 if this incoming call is the call the IP 90 has originally requested through the X.25 network.
15 The IP 90 takes control over the call and connects the incoming call with thesubscriber 20B, effectively connecting the subscriber 20A with the subscriber 20B.
Alternatively, the IP 90 can release the call control over to the SSP 30B after processing the ~flmini~trative tasks, such as charging, and allow the SSP 30B toconnect the incoming call with the subscriber 20B. This alternative implementation 20 elimin~tes the need for the IP 90 to utili~ two voice channels, one for the incoming call and the other for the subscriber 20B, to establish the connection.
If the subscriber 20A is busy when the SSP 30A tries to execute the set up as a result of the InitialCallAttempt message, the SSP 30A places a monitor on the subscriber 20A's line and the line status is continuously ch~c~ l Effectively, the SSP
25 30A performs functions equivalent to the previously mentioned Class AutomaticCallback (CAC) and Class Automatic Recall (CAR) features by queuing the request and ordering another call set up as soon as the monitored line is freed. However, according to the preferred embodiment of the present invention, once the monitored subscriber line goes idle, instead of generating a TCAP message toward the other30 exchange to allow the other exchange to reinitiate a new call setup, the SSP 30A
monitoring the line status initi~tes a call back toward the subscriber 20B directly. This CA 022367~4 1998-0~-04 is to make sure that the SSP 30A is the switch that is generating an incoming call into Country B.
If the subscriber 20A is not freed within a predetermined time period, the SCP
70 sends a TCAP message to the Converter 110 with an appropriate message code.
5 Consequently, the Converter 110 encodes the message into an X.25 packet and transmits it over the X.25 network to the IP 90 in Country B. The IP 90 extracts the necessary information from the X.25 packet and accordingly plays an announcementnotifying the subscriber 20B that the destination subscriber could not be reached and the call back request has failed. Moreover, if there is hardware congestion or physical 10 failure in the system, other error codes are sent back to the subscriber 20B to notify of the result.
Therefore, if the call back request has failed, no SS7 telecommunications link has ever been established between the subscriber 20B and the subscriber 20A. Therequest for the call back and the notice of the failure are all communicated over the 15 X.25 based computer network, much like an e-mail, and the subscriber 20B has incurred no telephone service charges.
Although a preferred embodiment of the method and apparatus of the present invention has been illustrated in the accompanying Drawings and described in theforegoing Detailed Description, it will be understood that the invention is not limited 20 to the embodiment disclosed, but is capable of numerous rearrangements, modifications and substitutions without departing from the scope of the invention as set forth and defined by the following claims.
AMEflDED SHEEI
Claims (11)
1. A system for providing call back subscriber features within a communications network, said system comprising:
a first local network in a first country (B) for ordering a call back request;
a second local network in a second country (A) for initiating a call setup to effectuate said call back request;
an Intelligent Peripheral IP (90) within said first local network for receiving said call back request and formatting said call back request into a data packet;
a computer communications link (130) connecting said first local network to said second local network, for transporting said data packet containing said formatted call back request therebetween;
an interface module (110) within said second local network for receiving said call back request data packet over said computer communications link from said IP; and a Common Channel Signaling System No. 7SS7 telecommunications network (140) connecting said first local network to said local second network and operating in response to the data packet sent over the computer communications link and received by the interface module to establish a communications call connection effectuating said call back request from said second local network to said first local network.
a first local network in a first country (B) for ordering a call back request;
a second local network in a second country (A) for initiating a call setup to effectuate said call back request;
an Intelligent Peripheral IP (90) within said first local network for receiving said call back request and formatting said call back request into a data packet;
a computer communications link (130) connecting said first local network to said second local network, for transporting said data packet containing said formatted call back request therebetween;
an interface module (110) within said second local network for receiving said call back request data packet over said computer communications link from said IP; and a Common Channel Signaling System No. 7SS7 telecommunications network (140) connecting said first local network to said local second network and operating in response to the data packet sent over the computer communications link and received by the interface module to establish a communications call connection effectuating said call back request from said second local network to said first local network.
2. The system of claim 1 wherein said second local network is implemented using an Intelligent Network IN architecture, said second local network comprising:
a Service Switching Point SSP (30) for providing telecommunications switching functions; and a Service Control Point SCP (70) for providing telecommunications subscriber features by controlling said SSP.
a Service Switching Point SSP (30) for providing telecommunications switching functions; and a Service Control Point SCP (70) for providing telecommunications subscriber features by controlling said SSP.
3. The system of claim 1 wherein said computer communications link (130) comprises a X.25 protocol based computer network.
4. The system of claim 3 wherein said interface module (110) comprises a converter that converts an X.25 data packet to a Transaction Capabilities Application Part TCAP based message to enable said call back request to be compatible with said SS7 telecommunications network.
5. The system of claim 2 wherein said interface module (110) connects said computer communications link (130) to said SCP (70) of said second local network.
6. The system of claim 1 wherein said IP comprises:
a Dual Tone Multi frequency DTMF receiver; and an announcement machine.
a Dual Tone Multi frequency DTMF receiver; and an announcement machine.
7. The system of claim 1 wherein said IP comprises:
a voice recognition module; and an announcement machine.
a voice recognition module; and an announcement machine.
8. A method of providing subscriber call back services for a first subscriber (20B) within a first country (B) toward a second subscriber (20A) within a second country (A), wherein said first country and said second country are connected using a Common Channel Signaling System No. 7 SS7 telecommunications network (140) and a X.25 based computer network (130), said method comprising the steps of:
receiving a call back request from said first subscriber by an Intelligent Peripheral IP (90) within said first country;
formatting said call back request into an X.25 based data packet by said IP;
transmitting said X.25 based data packet over said X.25 based computer network from said first country to said second country;
receiving said transmitted X.25 based data packet by a converter (110) within said second country;
converting said transmitted X.25 based data packet into a Transaction Capabilities Application Part TCAP message; and effectuating a call back service toward said first subscriber by a Service Control Point (70) within said second country with the information from said received TCAP message.
receiving a call back request from said first subscriber by an Intelligent Peripheral IP (90) within said first country;
formatting said call back request into an X.25 based data packet by said IP;
transmitting said X.25 based data packet over said X.25 based computer network from said first country to said second country;
receiving said transmitted X.25 based data packet by a converter (110) within said second country;
converting said transmitted X.25 based data packet into a Transaction Capabilities Application Part TCAP message; and effectuating a call back service toward said first subscriber by a Service Control Point (70) within said second country with the information from said received TCAP message.
9. The method of claim 8 wherein said step of formatting said X.25 based data packet further comprises the step of formatting in accordance with a Transmission Control Protocol / Internet Protocol TCP/IP standard.
10. The method of claim 8 wherein said step of effectuating call back service further comprises the steps of:
ringing said first subscriber located within said first country over said SS7 telecommunications network;
generating an announcement notifying said first subscriber that a call setup is being initiated toward said second subscriber;
initiating a call setup toward said second subscriber; and establishing a telecommunications link between said first subscriber and said second subscriber.
ringing said first subscriber located within said first country over said SS7 telecommunications network;
generating an announcement notifying said first subscriber that a call setup is being initiated toward said second subscriber;
initiating a call setup toward said second subscriber; and establishing a telecommunications link between said first subscriber and said second subscriber.
11. The method of claim 10 wherein said step of effectuating call back service further comprises the steps of:
queuing the call back requests if said second subscriber is busy; and initiating a new call setup toward said second subscriber when said second subscriber becomes idle.
queuing the call back requests if said second subscriber is busy; and initiating a new call setup toward said second subscriber when said second subscriber becomes idle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/552,368 US5661790A (en) | 1995-11-03 | 1995-11-03 | Call back service for a regulatory restrictive area |
| US08/552,368 | 1995-11-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2236754A1 true CA2236754A1 (en) | 1997-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002236754A Abandoned CA2236754A1 (en) | 1995-11-03 | 1996-11-01 | Call back service for a regulatory restrictive area |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US5661790A (en) |
| EP (1) | EP0858711B1 (en) |
| JP (1) | JPH11514808A (en) |
| KR (1) | KR19990067316A (en) |
| AU (1) | AU706800B2 (en) |
| CA (1) | CA2236754A1 (en) |
| DE (1) | DE69615389T2 (en) |
| ES (1) | ES2164927T3 (en) |
| WO (1) | WO1997016930A1 (en) |
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- 1996-11-01 DE DE69615389T patent/DE69615389T2/en not_active Expired - Lifetime
- 1996-11-01 CA CA002236754A patent/CA2236754A1/en not_active Abandoned
- 1996-11-01 WO PCT/US1996/017699 patent/WO1997016930A1/en active IP Right Grant
- 1996-11-01 ES ES96938766T patent/ES2164927T3/en not_active Expired - Lifetime
- 1996-11-01 JP JP9517618A patent/JPH11514808A/en active Pending
- 1996-11-01 EP EP96938766A patent/EP0858711B1/en not_active Expired - Lifetime
- 1996-11-01 AU AU76233/96A patent/AU706800B2/en not_active Ceased
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| DE69615389T2 (en) | 2002-07-04 |
| WO1997016930A1 (en) | 1997-05-09 |
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| DE69615389D1 (en) | 2001-10-25 |
| ES2164927T3 (en) | 2002-03-01 |
| AU7623396A (en) | 1997-05-22 |
| EP0858711A1 (en) | 1998-08-19 |
| US5661790A (en) | 1997-08-26 |
| KR19990067316A (en) | 1999-08-16 |
| JPH11514808A (en) | 1999-12-14 |
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| FZDE | Discontinued |