The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 2015
Filed:
Sep. 12, 2007
Sachin Garg, Bangalore, IN;
Navjot Singh, Denville, NJ (US);
Yu-sung Wu, West Lafayette, IN (US);
Sachin Garg, Bangalore, IN;
Navjot Singh, Denville, NJ (US);
Akshay Adhikari, Santa Clara, CA (US);
Yu-Sung Wu, West Lafayette, IN (US);
Avaya Inc., Basking Ridge, NJ (US);
Abstract
An apparatus and method for detecting intrusions in Voice over Internet Protocol systems with distributed stateful intrusion detection. When a Session Initiation Protocol (SIP) signal is received as an application-layer protocol signal, the received application-layer protocol signal is distributed to a first finite-state machine and to a second finite-state machine. A data processing system detects that the application-layer protocol enters a first application-layer protocol state S1 at a first node at a first time, determines whether the application-layer protocol fails to enter a second application-layer protocol state S2 at a second node within δ seconds, a positive real number, and generates a signal that indicates a potential intrusion in response to the determination.