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Utilizing SIP messages to determine the status of a remote terminal in VOIP communication systems

  • US 9,866,683 B1
  • Filed: 03/13/2017
  • Issued: 01/09/2018
  • Est. Priority Date: 11/23/2016
  • Status: Active Grant
First Claim
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1. A method for detecting fraudulent activity in a communication system serving a correctional facility, comprising:

  • receiving a packet stream associated with a voice call utilizing voice over internet protocol (VoIP) between an inmate call party and an outside call party, the packet stream including a session initiation protocol (SIP) message stream;

    determining a call phase of the voice call based on the packet stream, wherein the call phase is one of a call setup phase and a call established phase, the call established phase occurring after a successful end of the call setup phase;

    flagging a first SIP message from within the SIP message stream as requiring further investigation, wherein the determining that the first SIP message requires further investigation includes;

    determining, during the call setup phase, that a message type associated with the first SIP message is one of a 181 Response or a 3xx Response, wherein 3xx in the 3xx Response represents an integer between 300 and 399;

    ordetermining, during the call established phase, that the message type is one of an INVITE or a REFER; and

    in response to the flagging that the first SIP message requires further investigation, confirming that a disallowed third party has joined the voice call based at least in part on a first content of the first SIP message or a second content of a second SIP message, the second SIP message appearing after the first SIP message within the SIP message stream.

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