Multiplex communications – Data flow congestion prevention or control – Flow control of data transmission through a network
Reexamination Certificate
2008-04-22
2008-04-22
Chan, Wing (Department: 2616)
Multiplex communications
Data flow congestion prevention or control
Flow control of data transmission through a network
C370S252000
Reexamination Certificate
active
09911256
ABSTRACT:
A system and method for determining flow quality statistics for real-time transport protocol (RTP) data flows is disclosed. Generally, a first endpoint is connected to a second endpoint, wherein the first endpoint comprises a transceiver, software stored within the first endpoint defining functions to be performed by the first endpoint, and a processor. The processor is configured by the software to perform the steps of, determining latency for the RTP data flows, determining jitter for the RTP data flows, and/or determining lost packets for the RTP data flows. Latency is determined by the first endpoint transmitting a test data packet to the second endpoint; the second endpoint looping the test data packet back to the first endpoint; comparing when the test data packet was received by the first endpoint to when the test data packet was sent to the second endpoint, to determine a round trip time; and, dividing the round trip time in two, resulting in the latency. Jitter is determined by beginning a timer when a first data packet of an RTP data flow is received by the first endpoint; stopping the timer when a second data packet of the RTP data flow is received by the first endpoint; and, adding measured time from the beginning of the timer to the stopping of the timer to an aggregate to obtain the jitter for the RTP data flow. Lost packets are determined by determining a sequence number of a received RTP data packet within the RTP data flow; storing the determined sequence number; calculating whether the determined sequence number sequentially falls within a numerical order; and, if the sequence number of the received RTP data packet does not sequentially fall within the numerical order, storing the sequence number as a missed RTP data packet.
REFERENCES:
patent: 5450394 (1995-09-01), Gruber et al.
patent: 5878032 (1999-03-01), Mirek et al.
patent: 5898697 (1999-04-01), Hurme et al.
patent: 6023455 (2000-02-01), Takahashi
patent: 6501763 (2002-12-01), Bhagavath et al.
patent: 6567929 (2003-05-01), Bhagavath et al.
patent: 6643496 (2003-11-01), Shimoyama et al.
patent: 6678250 (2004-01-01), Grabelsky et al.
patent: 6741569 (2004-05-01), Clark
patent: 0 948 165 (1999-06-01), None
patent: 2 355 901 (2001-02-01), None
H. Schulzrinne et al, “RFC 1889—RTP: A Transport Protocol for Real-Time Applications”, Jan. 1996; Audio-Video Transport Working Group, Section 6.3-6.3.2 (6 pages), Table of Contents (2 pages).
Mart et al., “Firewall Control Requirements,” MidCom Bof, Internet Draft, Nov. 2000, pp. 1-16.
Melinda Shore, “H.323 and Firewalls: Problem Statement and Solution Framework,” Internet Draft, Feb. 3, 2000, pp. 1-19.
Thernelius et al., “SIP Firewall Solution,” SIP Working Group, Internet Draft, Jul 2000, pp. 1-32.
N. Freed, “Behavior of and Requirements for Internet Firewalls,” Network Working Group, Internet Draft, Oct. 2000, 1-14.
D. Newman, “Benchmarking Terminology for Firewall Performance,” Network Working Group, The Internet Society, Aug. 1999, pp. 1-49.
F. Finlayson, “IP Multicast and Firewalls,” Network Working Group, The Internet Society, May 1999, pp. 1-23.
S. Bellovin, “Firewall-Friendly FTP,” Network Working Group, Feb. 1994, pp. 1-7.
Montenegro et al., “Suns's SKIP Firewall Traversal for Mobile IP,” Network Working Group, The Internet Society, Jun. 1998, pp. 1-45.
Gaynor et al., “Firewall Enhancement Protocol (FEP),” Network Working Group, The Internet Society, Apr. 1, 2002, pp. 1-22.
Andrew Molitor, “A Firewall Solution for Voice Over IP,” Aravox Report, Aravos Technologies, pp. 1-2.
“Aravox Firewall Benefits,” Aravox Technologies, pp. 1-9.
Dr. Andrew Molitor, “Can Voice Over IP Work without Dynamic NAT?”, Aravox Report, Aravox Technologies, pp. 1-2, 2002.
Dr. Andrew Molitor, “Deploying a Dynamic Voice over IP Firewall with IP Telephony Applications,” Aravox Report, Aravox Technologies, pp. 1-5, 2002.
Dr. Andrew Molitor, “Firewall Control for IP Telephony,” Aravox Report, Aravox Technologies, pp. 1-5, 2002.
Molitor et al., “High Performance H.323 Firewalling for VoIP Solutions,” Aravox Report, Aravox Technologies, pp. 1-2, 2002.
“What is Unique about IP Telephony?,” Aravox Technologies, Spring 2001 IP Expo, pp. 1-16.
Dr. Andrew Molitor, “Searching VoIP Networks with Specific Techniques, Comprehensive Policies and VoIP-Capable Firewalls,” Aravox Report, Aravox Technologies, pp. 1-3, 2002.
Utz Roedig, “Security Analysis of IP-Telephony Scenarios,” Presentation by Darmstadt University of Technology, pp. 1-28, 2002.
F. Thernelius, “SIP, NAT, and Firewalls,” Master Thesis, Ericsson Department of Teleinformatics, May 2000, pp. 1-69.
Bellovin, “Distributed Firewalls” ;login: Magazine, Nov. 1999, pp. 37-39 (1-10).
“Firewall ActiveX Control for Microsoft Windows,” Distinct Corporation, 1996-1998, pp. 1-45.
Jiri Kuthan, “Firewall Control,” Flow Processing Control Protocol, p. 1-3, 2001.
Crosswell, “Advanced Networking Information,” Columbia University Academic Information Systems, Mar. 21, 2000, pp. 1-22.
“Cisco Secure PIX Firewall Software v5.2,” Cisco Data Sheet, pp. 1-7, 2001.
“Cisco Secure PIX 500 Firewalls,” Cisco Products & Technologies, 1992-2000, pp. 1-3.
“Cisco Secure PIX Firewall,” Internet Product Watch, Apr. 12, 2001, pp. 1-2.
“Media Firewall,” www.marconi.com, 2000, pp. 1-4.
“Media Firewall,” www.marconi.com, 2001, pp. 1-3.
“ATM Switch Network Modules: LAN, WAN, and Service Interfaces for TNX-210, TNX-1100, ASX-200BX, ASX-1000 and ASX-1200 ATM switches,” www.marconi.com, 2000, pp. 1-12.
“Marconi's Next GEneration IP and Multi-Service Switch Router Enables End-to-End Differentiated Services,” www.marconi.com, Nov. 6, 2000, pp. 1-3.
“Transforming Communications and Information with Enterprise-Focused Ethernet Solutions,” www.marconi.com., pp. 1-6, 2002.
“Marconi Expands Networking Product Portfolio with Solutions for Emerging Enterprise Needs,” www.marconi.com, Jul. 24, 2000, pp. 1-2.
“Marconi to Showcase ‘Smart and Fast’ Switch/Router at CeBIT,” www.marconi.com, Jan. 22, 2001, pp. 1-2.
“Marconi Demonostrates Converged Distance-Learning Solutions at Educause 2000,” www.marconi.com, Oct. 10, 2000, pp. 1-2.
“Firewall Security,” www.marconi.com, Oct. 30, 2000, pp. 1-2.
“SA-400, IP/ATM Firewalling for ATM Networks,” www.marconi.com, pp. 1-4, 2002.
“Media Firewall,” www.marconi.com, 2001, pp. 1-3.
“NSX-9500, Routing, LANE, and Firewalling Services for ATM Backbone Networks,” www.marconi.com, 2000, pp. 1-4.
“The New Public Network: Scalable, Flexible, PSTN Features, IN Features, Signalling Gateway,” www.marconi.com, 1999, pp. 1-4.
“Sphericall Voice Internetworking Multiplexer (VIM) Product Overview,” www.marconi.com, 2001, pp. 1.
“ServiceOn Accountant 2.0: Per-call Usage Based Billing for Differentiated Services,” www.marconi.com, Dec. 12, 2000, pp. 1-2.
“Marconi extends Optical Networking; Introduces Advanced Multiservice Platform,” www.marconi.com, Jun. 6, 2000, pp. 1-2.
“ATM Switched Network Modules Product Overview,” www.marconi.com, 2001, pp. 1-4.
“Security is the Key,” Marconi Interface, May 2000, p. 30.
“Firewall Switching Agent,” www.marconi.com, 2001, pp. 1-4.
“ESX-2400 and ESX-4800 Firewall Accelaration Switches,” www.marconi.com, 2001, pp. 1-8.
“IP/ATM Firewalling for ATM Networks,” www.marconi.com, 2001, pp. 1-4.
“ESX-2400 and ESX-4800 Product Overview,” www.marconi.com, 2001, pp 1-3.
“FSA Product Overview,” www.marconi,com, 2001, pp. 1-2.
Parthen
Dobbins Ephraim W.
MeLampy Patrick J.
Norton Stephen E.
Penfield Robert F.
Acme Packet Inc.
Thomas Kayden Horstemeyer & Risley LLP
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