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:
Aug. 15, 2017
Filed:
Sep. 12, 2007
Sachin Garg, Bangalore, IN;
Navjot Singh, Denville, NJ (US);
Akshay Adhikari, Santa Clara, CA (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 are disclosed for detecting intrusions in Voice over Internet Protocol systems, without the use of an attack signature database. In particular, the illustrative embodiment is based on the observation that some VoIP-related protocols (e.g., the Session Initiation Protocol [SIP], etc.) are simple enough to be represented by a finite-state machine (FSM) of compact size. A finite-state machine is maintained for each session/node/protocol combination, and any illegal state or state transition—which might be the result of a malicious attack—is flagged as a potential intrusion.