Call classification through analysis of DTMF events

US11388490B2 · kind B2 · utility

Assignee

• Pindrop Security, Inc. · US

Inventors

• Nick Gaubitch · Atlanta, US
• Scott Strong · Atlanta, US
• John Cornwell · Atlanta, US
• Hassan Kingravi · Atlanta, US
• David Dewey · Milton, US

Key dates

• Filing date: Jan 25, 2021
• Grant date: Jul 12, 2022
• Expiry date: Jan 25, 2041

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04Q2213/13515
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

Systems, methods, and computer-readable media for call classification and for training a model for call classification, an example method comprising: receiving DTMF information from a plurality of calls; determining, for each of the calls, a feature vector including statistics based on DTMF information such as DTMF residual signal comprising channel noise and additive noise; training a model for classification; comparing a new call feature vector to the model; predicting a device type and geographic location based on the comparison of the new call feature vector to the model; classifying the call as spoofed or genuine; and authenticating a call or altering an IVR call flow.