System and method for spam detection

Details System and method for spam detection System and method for spam detection

2008-06-02

2011-12-27

Tran, Quoc D (Department: 2614)

Telephonic communications

Reception of calling information at substation in wireline...

Extracting call id from transmitted signal

C379S088020, C370S352000

Reexamination Certificate

active

08085915

ABSTRACT:
A voice-over-internet protocol (VoIP) caller verification method includes generating a challenge to be sent to a VoIP caller which needs a response from the VoIP caller prior to accepting a VoIP call, wherein the challenge includes a test pattern crafted to create a greater load at a spammer VoIP caller as compared to a human VoIP caller. A response or lack thereof is determined from the VoIP caller, and the response is analyzed relative to an acceptable response to determine whether the VoIP caller is acceptable to communicate with.

REFERENCES:
patent: 6542583 (2003-04-01), Taylor
patent: 7463724 (2008-12-01), Ruckart
patent: 2002/0120853 (2002-08-01), Tyree
patent: 2004/0199597 (2004-10-01), Libbey et al.
patent: 2004/0254793 (2004-12-01), Herley et al.
patent: 2007/0121596 (2007-05-01), Kurapati et al.
patent: 1390014 (2003-01-01), None
patent: 1648924 (2005-08-01), None

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