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Ottawa, Canada

Nortel Networks Corporation, formerly known as Northern Telecom Limited and sometimes known simply as Nortel, was a multinational telecommunications and data networking equipment manufacturer headquartered in Mississauga, Ontario, Canada. It was founded in Montreal, Quebec in 1895. At its height, Nortel accounted for more than a third of the total valuation of all the companies listed on the Toronto Stock Exchange , employing 94,500 worldwide.On January 14, 2009, Nortel filed for protection from its creditors in the United States, Canada, and the United Kingdom, in order to restructure its debt and financial obligations. In June 2009, the company announced it would cease operations and sell off all of its business units.The period of bankruptcy protection was extended to February 2, 2013.As part of the bankruptcy proceedings in the United States, Nortel Networks Inc. publishes monthly operating reports outlining cash receipts and disbursements. Wikipedia.


Patent
Nortel Networks | Date: 2012-04-24

Within an access services network (ASN) operable for providing wireless access services to an access terminal and including a base station communicatively coupled to an ASN gateway, a new management protocol is provided for managing the R


Patent
Nortel Networks | Date: 2012-03-21

The present invention provides a system and method to selectively negotiate different delivery styles for different types of packets sent from the Mobile Node to the Foreign Agent, which will allow the Mobile Node to negotiate a delivery style that will permit the Foreign Agent to transmit certain selected outbound traffic directly without reverse tunneling that traffic back to the home network. Specifically, the present invention allows the Foreign Agent to distinguish between certain types of BC/MC packets that are designated to be processed and routed to their destinations by the Foreign Network directly, as opposed to reverse tunneling the outbound traffic from the Foreign Agent back to the Home Agent on the home network. By selecting processing by the Foreign Network, the efficiency of the system will improve because the transmission of outbound traffic and inbound responses will not need to be tunneled through the Home Network.


Patent
Nortel Networks | Date: 2012-04-11

A push to talk message protocol operating on a communication network between an originating and terminating communication device operates to transmit compressed message formats to initiate the push to talk message protocol. Four compressed session protocol message formats are used in the preferred embodiment. A compressed originating session initiation invite message is transmitted from the originating mobile station. A compressed terminating session initiation invite message is received by the terminating mobile station. A compressed session initiation protocol ping message is transmitted from the originating mobile station and received by the terminating mobile station. A compressed 200 OK session initiation protocol message is transmitted from the terminating mobile station and received by the originating mobile station. Finally, the originating mobile decompresses the 200 OK session initiation protocol message. These compressed messages are used to initiate the push to talk communication session.


Patent
Nortel Networks | Date: 2012-04-11

The present invention supports a method for transmitting information packets across network firewalls. A trusted entity is provisioned with an address designation for a pinhole through the firewall during setup of a communication session between two communication devices. This pinhole address is used throughout the communication session between the two communication devices to transmit information packets onto and out of the communication network. Information packets addressed to the communication device inside the firewall are received by the trusted entity, which replaces address header information in the information packet with the address for the pinhole. The information packet is routed to the pinhole where it passes onto the network for routing to the communication device inside the firewall. Information packets transmitted from the network are also routed to the trusted entity for routing toward the communication device outside the firewall.


A method of defending against a denial-of-service (DoS) attack on an IPv6 neighbor cache includes steps of determining a number of neighbor cache entries currently stored in the neighbor cache and then determining whether the number of entries exceeds a neighbor cache threshold that is less than a neighbor cache limit defining a maximum capacity of the neighbor cache. When the number of entries in the neighbor cache exceeds the neighbor cache threshold, stateless neighbor resolution is triggered. Stateless neighbor resolution entails sending a neighbor solicitation to resolve an address for an incoming packet without logging a corresponding entry in the neighbor cache. Additional techniques that complement the above method involve purging of neighbor cache entries designated as incomplete, prioritization of the entries based on trustworthiness, shortening the incomplete-status timer to less than 3 seconds, and curtailing the number of retransmissions of the neighbor solicitations.

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