Source: http://www.google.com/patents/US6453035?dq=7,599,983
Timestamp: 2014-07-12 09:44:19
Document Index: 537269230

Matched Legal Cases: ['arty 56', 'arty 58', 'arty 56', 'arty 58', 'arty 56', 'arty 58']

Patent US6453035 - Method and apparatus for providing virtual private network services over ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA method of providing a Private Telephone Network over a Public Telephone Network is described. A Private Network is a telecommunications service which has controlled access, and is generally provided to customers having two or more geographic locations. A Private Network is provided by embedding originating...http://www.google.com/patents/US6453035?utm_source=gb-gplus-sharePatent US6453035 - Method and apparatus for providing virtual private network services over public switched telephone networkAdvanced Patent SearchPublication numberUS6453035 B1Publication typeGrantApplication numberUS 09/033,278Publication dateSep 17, 2002Filing dateMar 2, 1998Priority dateMar 2, 1998Fee statusPaidPublication number033278, 09033278, US 6453035 B1, US 6453035B1, US-B1-6453035, US6453035 B1, US6453035B1InventorsElias Psarras, R. William Carkner, Marc CottonOriginal AssigneeStentor Resource Centre Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (24), Non-Patent Citations (1), Referenced by (22), Classifications (11), Legal Events (7) External Links: USPTO, USPTO Assignment, EspacenetMethod and apparatus for providing virtual private network services over public switched telephone networkUS 6453035 B1Abstract A method of providing a Private Telephone Network over a Public Telephone Network is described. A Private Network is a telecommunications service which has controlled access, and is generally provided to customers having two or more geographic locations. A Private Network is provided by embedding originating customer site identification and a Private Network Routing Code into an Initial Address Message at the originating End Office associated with the originating customer site. This Initial Address Message is routed to a Service Switching Point by the Private Network Routing Code. At the Service Switching Point, reference is made to databases defining the members of the Private Network, and a destination End Office identification and a destination customer site identification associated with the destination customer site is embedded into the Initial Address Message. The Initial Address Message is then routed to the destination End Office Switch by a Public Network Routing Number associated with the destination End Office Switch. This will permit a Private Network to be provided over a Public Telephone Network, taking advantage of the inherent redundancy and reliability of the Public Telephone Network.
BACKGROUND OF THE INVENTION Virtual Private Networks (VPNs) provide multi-site organizations with an internal communication network, at a lower cost than placing equivalent long distance calls over the Public Switched Telephone Network (PSTN). Furthermore, additional services can be offered to such customers that are not available on the Public Switched Telephone Network, such as abbreviated private numbering plans and the ability to recognize an incoming call as being on-net. Typical organizations which demand such services are banks, real estate firms, health care systems, school systems and governmental agencies.
It is known that the costs of offering VPN DAL services could be reduced with the use of a VPN service offered over the PSTN. This is illustrated in an article entitled �Evolution in Business Networks� BNR Telesis 1988 three. In the BNR article, a VPN is described where translations are performed from the private numbering plan to NANP format, at the respective Ingress and Egress End Offices. The biggest problem with this implementation is that any initial setup or change to a customer's VPN requires that each End Office be accessed and changed. Such a system requires that changes be made at all sites, possibly at great labour cost and downtime, and that the timing of changes be coordinated.
SUMMARY OF THE INVENTION It is therefore an object of the invention to provide a Virtual Private Network on the Public Telephone Network.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION A summary of the acronyms used herein is as follows:
An embodiment of the invention will now be described with respect to FIG. 2. In the discussion of FIG. 2, the terms �Ingress� or �Originating� will be used to describe the transmission of the IAM between the originating customer or Calling Party 56 and the Service Control Point 48 in the Overlay Network 46. The terms �Egress� or �Destination� will be used to describe the transmission of the IAM between the Service Control Point 48 and the destination customer or Called Party 58. Those Switching Points which serve on ingress will be referred to as �Ingress� or �Originating� Switching Points, and those serving on egress, will be referred to as �Egress� or �Destination� Switching Points.
When Calling Party 56 wishes to reach a Called Party 58 accessible via the VPN, the Calling Party 56 dials a series of digits identifying to the network the Called Party 58. Step 88 identified in FIG. 3a, is the step of receiving the dialled number at the Ingress End Office Network Access Point 12. The dialled number received can be in any one of the following formats, though the format most pertinent to the invention is the second case, �Call to private number (1 to 15 digits)�:
It should be noted that although the CdPN is being used to index the routing table, as known in the art, the CdPN parameter in the invention does not contain the Called Party Number, but contains the Private Network Routing Code+OSID+OTG. The standard routing translator is responsive to the Private Network Routing Code without any modifications, because the first character is a �1� which is not associated with a valid NANP area code, which selects an egress trunk group for the IAM to obtain additional routing instructions.
The trunk groups can be datafilled to either play inband treatments to the user, or to release the IAM back to the EO NAP with a CSS7 ISUP release message. For voice calls it may be desirable to have the SCP play an inband treatment, for example, �You have entered an invalid account code�, in the preferred language of the customer. For ISDN data calls, inband treatments are not needed as data terminals are typically not equipped with speakers. Thus, for ISDN calls, it is therefore appropriate to release the IAM with a cause value that can be interpreted by the ISDN terminal.
The CdPN parameter is used to determine the routing of the IAM from the Originating EO 12 to the PSTN 44 by indexing an internal database or routing table 152, as known in the art. However, the CdPN parameter in the invention does not contain the Called Party Number, as known in the art, but contains the Private Network Routing Code+OSID+OTG values. Routing table 152 is responsive to the Private Network Routing code without any modifications, because the first character of the Private Network Routing Code is a �1� which is not associated with a proper dialled number, specifically a valid NANP area code. This instructs the TO 22 to route the IAM to a SP which can provide additional routing instructions. Accordingly, the IAM is routed to the PSTN 44 via trunk group 76 between the EO 12 and TO 22. At the TO 22, a similar detection is made and the IAM is transmitted to the SSP 34 via trunk group 80.
The term �internal database� is used to describe databases either internal to a switching office, or directly accessible from that switching office. This is intended to be distinct only from remote databases, such as a Data Access Point or Service Control Point. Clearly, the invention could be implemented in either manner. Furthermore, each switch is generally described as including a single database though clearly, the invention could be implemented by accessing multiple databases.
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AN ASSIGNMENT PREVIOUSLY RECORDED ON REEL 9013, FRAME 0038;ASSIGNORS:PSARRAS, ELIAS;CARKNER, R. WILLIAM;COTTON, MARC;REEL/FRAME:009442/0928;SIGNING DATES FROM 19980223 TO 19980226Mar 2, 1998ASAssignmentOwner name: STENTOR RESOURCE CENTRE INC., CANADAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:PSARRAS, ELIAS;CARKNER, WILLIAM R.;COTTON, MARC;REEL/FRAME:009013/0038;SIGNING DATES FROM 19980223 TO 19980226RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google