Patrick T Ma, 28Richardson, TX

6373857, Apr 16, 2002

Nov 13, 1998

09/191899

Patrick SzeChing Ma - Plano TX

Nortel Networks Ltd. - St. Laurent

H04J 324

370475, 3703952

An Internet Protocol (IP) telephony system cross-references transport addresses of Gatekeepers using a domain name of the IP telephony system. The IP telephony system is serviced by at least one Gatekeeper and the transport address for each Gatekeeper is stored on a Domain Name Server (DNS). An A record or other suitable record may be employed within the DNS to index the transport addresses of the Gatekeepers to the IP telephony system domain name. A calling endpoint first queries the DNS for the transport address of a Gatekeeper servicing the IP telephony system. The DNS address retrieves at least one transport address for the Gatekeeper(s) and returns the transport address(es) to the calling endpoint. When querying the DNS, the calling endpoint may use an identifier such as subscribername Gatekeeper. ABC. domain where the user name of the called endpoint is âsubscribernameâ and the domain name of the IP telephony system is ABC. domain.

6519249, Feb 11, 2003

Dec 23, 1998

09/220549

Brian Joseph Bennefeld - Allen TX
Patrick SzeChing Ma - Plano TX
Gregory Scott Graham - Richardson TX
Michael Flynn Thomas - Plano TX

Nortel Networks LTD - St. Laurent

H04L 1266

370352, 370465

An Internet Protocol (IP) telephony system manages Gatekeeper subscriber load by assigning subscriber load among a plurality of Gatekeepers during the Gatekeeper discovery and registration process. A Registration Load Management Unit (RLMU) is primarily responsible for assigning subscriber load to the plurality of Gatekeepers. In one embodiment, the plurality of Gatekeepers are organized without a hierarchy structure and are made up of a plurality of Gatekeeper service nodes and a plurality of Gatekeeper Database nodes. The Gatekeeper service nodes provide the Registration, Admission, Status, Location, Call Set Up and other operating functions of the Gatekeeper while the plurality of Gatekeeper Database nodes store subscriber information. In a second embodiment, the plurality of Gatekeepers are organized in a hierarchy with a Root Gatekeeper at the top of the hierarchy and a plurality of Gatekeepers residing below the Root Gatekeeper in the hierarchy.

6795867, Sep 21, 2004

Dec 23, 1998

09/220550

Patrick SzeChing Ma - Plano TX
Michael Flynn Thomas - Plano TX
Brian Joseph Bennefeld - Allen TX

Nortel Networks Limited - St. Laurent

G06F 1516

709240, 709227, 709238, 370237, 370352, 370400

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. In selecting the servicing Gateway, the LMU may consider loading on each Gateway, availability of each Gateway (e. g.

2013001, Jan 10, 2013

Jul 6, 2012

13/542930

Adel Mostafa - Toronto, CA
Trung Tran - Wylie TX, US
William Janning - Allen TX, US
Patrick Ma - Plano TX, US

H04N 7/14

348 1401, 348E07077

Described are embodiments for allowing the negotiation of a continuous presence layout. Specifically, in embodiments, an offer is generated by a client that includes attributes for displaying continuous presence video information. The attributes include, in some embodiments, one or more window identifiers, one or more bandwidth limit identifiers, one or more group numbers, and/or one or more ranks. The offer is sent to a server which transmits an answer to the offer. Once the attributes for the continuous presence layout has been negotiated, the server uses the attributes to format video content sent to the client.

5953338, Sep 14, 1999

Dec 13, 1996

8/764959

Patrick S. Ma - Plano TX
Gregory S. Graham - Garland TX

Northern Telecom Limited - Montreal

H04L 1228
H04L 1256

370395

A system comprises a system control module and a plurality of interconnected asynchronous transfer mode switches the interconnected asynchronous transfer mode switches are interconnected with one another via at least one physical interface to form a network. The network is used to transfer various types of information. Each asynchronous transfer mode switch has a connection admission control module to determine whether a virtual connection, such a virtual path, virtual channel, or grouping of virtual paths, can be connected through that particular asynchronous transfer mode switch. The virtual connection is formed from one asynchronous transfer mode switch to at least one other asynchronous transfer mode switch via a link of the at least one physical interface. The system control module connects to at least one asynchronous transfer mode switch and determines whether the virtual connection can be created in the network. A process of monitoring a utilization level of a grouping of a virtual path on a physical interface comprises checking the utilization level of the virtual path, updating an amount of available bandwidth for the virtual path, and comparing the amount of available bandwidth with a maximum threshold for the available bandwidth and setting an overload condition if the amount exceeds the maximum threshold and clearing the overload condition if the amount is below the maximum threshold.