Patents Represented by Attorney, Agent or Law Firm John R. Witcher
  • Patent number: 6795867
    Abstract: An Internet Protocol (IP) voice telephony system constructed according to the present invention manages Gatekeeper load by redirecting calls from an assigned Gatekeeper to a servicing Gatekeeper during call setup. A Load Management Unit (LMU) processes all setup messages. In processing the setup messages, the LMU receives the message from the assigned Gatekeeper to which a requesting endpoint is registered. Upon receipt, the LMU determines which Gatekeeper of a plurality of Gatekeepers should setup and service the call. Based upon its selection, the LMU either directs the assigned Gatekeeper to setup and service the call or redirects the endpoint to a servicing Gatekeeper. Upon receipt of a redirection message, the endpoint sends a confirmation message to the assigned Gateway and then sends a setup message to the servicing Gateway. Upon receipt of the setup message, the servicing Gateway sets up and services the call.
    Type: Grant
    Filed: December 23, 1998
    Date of Patent: September 21, 2004
    Assignee: Nortel Networks Limited
    Inventors: Patrick SzeChing Ma, Michael Flynn Thomas, Brian Joseph Bennefeld
  • Patent number: 6782417
    Abstract: Advertising system for callers to busy data service providers. A caller to an ISP or similar service for which the number is busy can be automatically connected to a server which provides advertisements or other information while waiting for the number to become free. The connection to the server is dropped automatically when the ISP number is no longer busy, and a connection to the service provider originally dialed is automatically established. Software in a PSTN implements part of the invention, while software in a computer application or modem firmware implements the steps of the invention performed at the CPE. A user of the invention need not keep trying a busy number, and the feature can be paid for by revenue from selling the advertising.
    Type: Grant
    Filed: October 12, 1999
    Date of Patent: August 24, 2004
    Assignee: Nortel Networks Limited
    Inventor: Sanjay H. Rao
  • Patent number: 6732174
    Abstract: An integrated wireless and wireline telecommunication switch. The switch includes peripheral modules having both wireless and wireline peripheral devices. The switch also includes wireless and wireline software load. An aspect table allows the wireless and wireline software load within the switch to be executed within a single call without creating direct dependencies on each other. The switch allows new and more efficient connections between wireless and wireline subscribers. In many cases wireless and wireline subscribers having direct access to the switch can connect without using any other switches in the network.
    Type: Grant
    Filed: May 5, 1998
    Date of Patent: May 4, 2004
    Assignee: Nortel Networks Limited
    Inventors: Chandrakant Gundecha, William David Gentry, Roy Emery Hanzel, C. Michael Brown, Sanjay Bhatia, David Anthony Gallagher
  • Patent number: 6657992
    Abstract: A system and method of using multiple service providers to provide subscriber services on a per call basis achieved by using H.323 capability in a gatekeeper to identify call signaling transfer addresses used for each call. Service subscription data is based on the address or alias being used to place or receive a call. Since telephones can have the ability to register multiple addresses simultaneously, the same phone can receive service from multiple providers simultaneously. In addition, it is possible that some of the addresses or aliases used may be part of a private address space such as, for instance, a private branch exchange (PBX) system. This would enable service from a provider that is not a registered public telephone service provider.
    Type: Grant
    Filed: February 12, 1999
    Date of Patent: December 2, 2003
    Assignee: Nortel Networks Limited
    Inventor: Samuel H. Christie, IV
  • Patent number: 6563795
    Abstract: A telecommunications network such as an ATM, Frame Relay or packet based network will be better managed by identifying nodes through which a virtual connection is routed between two end nodes. A new method of tracing the nodes on the route includes sending trace cells downstream of a monitoring node toward one or both end nodes. Each downstream node either loops back a trace cell identifying itself to the monitoring node or forwards the trace cell further. A plurality of trace cells sent along the route identify nodes located thereon. In one embodiment, the trace cell is an extension of the ATM FMOAM cell (ATM Fault Management OAM cell) specified for loopback functions.
    Type: Grant
    Filed: April 16, 1999
    Date of Patent: May 13, 2003
    Assignee: Nortel Networks Limited
    Inventors: John Gerald Gruber, Asghar Ebrahim Methiwalla, Richard Vickers
  • Patent number: 6549621
    Abstract: A method and system for integrating a computer and a telephone. A stimulus messaging device, such as an analog telephone, is provisioned as a functional messaging device, such as an ISDN telephone, at a switch. The switch communicates with the telephone through a loop interface device. The loop interface device translates ISDN messages destined for the telephone received from the switch into analog signals for the telephone. The loop interface device also sends the ISDN messages received from the switch to a computer associated with the telephone. The loop interface device translates analog signals received from the telephone into ISDN messages for transmission to either the switch and/or the computer. The present invention enhances call control information for an analog telephone and allows tight integration between a telephone and a computer.
    Type: Grant
    Filed: July 26, 1999
    Date of Patent: April 15, 2003
    Assignee: Nortel Networks Limited
    Inventors: Samuel H. Christie, IV, Patrick J. Dagert