Methods and Nodes in a Lawful Interception System
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsLuciano Orabona, Pompeo Santoro, Andrea Senatore, Elvira Villani
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to the problem to deliver correlation information, CN, in case of CC delivery in TDM format to a Monitoring Centers, MC in a circuit switched network and achieving a minimal impact to MCs and/or no impact on the operator network at all. Said problem is solved by using the extension field of calling or called party number for providing the correlation number to a MC from a Mediation Function entity.
Claims17
1-20. (canceled)
A method of operating a Mediation Function (MF) node of a Lawful Intercept (LI) system, the MF being configured to deliver received Content of Communication (CC) and Intercept Related Information (IRI) to a Monitoring Center (MC) monitoring a target's sessions, the MC being situated in and supported by a circuit switched (CS) communications system;
- the method comprising:
- receiving IRI and CC of a target's session intercepted during a VoIP session;
- generating a correlation number (CN) for the IRI and CC of the intercepted session;
- retrieving, if MC is in a CS system, the calling party number of the MF and/or the called party number of the MC;
- inserting the CN in an extension field of the calling or called party number;
- initiating, after receiving the CC, a CC transmission session via a Session Initiating Protocol (SIP) call to the MC by sending a SIP invitation comprising CN in the extension field of the called party number or of the calling party number towards a Border Gateway Control Function (BGCF) node for selecting a Media Gateway;
- and
- sending, to the MC:
- CC packets over Handover Interface HI3 via the selected Media Gateway for the Media Gateway to convert the CC packet format into Time-Division Multiplexing (TDM) format;
- and
- IRI over Handover Interface HI2 using the same CN.
A method of operating a Monitoring Center (MC) of a Lawful Intercept (LI) system, the MC being configured to receive Content of Communication (CC) and Intercept Related Information (IRI) from a Mediation Function (MF) node, wherein the MC is situated in and supported by a circuit switched (CS) communications system;
- the method comprising:
- receiving a correlation number (CN) of a target's session in an extension field of a called party number or of a calling party number in an initiate address message;
- searching for the CN in the extension field in the calling party number or in the called party number;
- accepting a transmission session with the MF if the CN is identified in an extension field;
- and
- receiving, from the target's session:
- converted Time-Domain Multiplexing (TDM) traffic from the MF over Handover Interface HI3 via a Media Gateway node;
- and
- IRI over Handover Interface HI2 from the MF using the same CN.
A Mediation Function (MF) node of a Lawful Intercept (LI) system;
- the MF being configured to deliver received Content of Communication (CC) and Intercept Related Information (IRI) to a Monitoring Center (MC) monitoring a target's sessions;
- the MC being situated in and supported by a circuit switched (CS) communications system;
- the MF node comprising:
- a communication interface configured to receive IRI and CC of a target's session intercepted during a VoIP session;
- processing circuitry operatively connected to the communication interface and configured to:
- generate a correlation number (CN) for the IRI and CC of the intercepted session;
- retrieve, if MC is in a CS system, the calling party number or the called party number;
- inserting the CN in an extension field of the calling or called party number;
- and
- initiate, after receiving the CC, a CC transmission session via a Session Initiating Protocol (SIP) call to the MC by sending a SIP invitation comprising CN in the extension field of the called party number or of the calling party number towards a Border Gateway Control Function (BGCF) node for selecting a Media Gateway (MGW);
- wherein the communication interface is further configured to send to the MC:
- CC packets over Handover Interface HI3 via the selected Media Gateway for the Media Gateway to convert the CC packet format into Time-Division Multiplexing (TDM) format;
- and
- IRI over Handover Interface HI2 using the same CN.
A Monitoring Center (MC) node of a Lawful Intercept (LI) system;
- the MC being configured to receive Content of Communication (CC) and Intercept Related Information (IRI) from an Mediation Function (MF) node;
- wherein the MC is situated in and supported by a circuit switched (CS) communications system;
- the MC comprising:
- a communication interface configured to receive a correlation number (CN) of a target's session in an extension field of a called party number or of a calling party number in an initiate address message;
- processing circuitry operatively connected to the communication interface and configured to:
- search for the CN in the extension field in the calling party number or called party number;
- and
- accept, if the CN is identified in an extension field, a transmission session with the MF;
- wherein the communication interface is further configured to receive from the MF:
- Time-Division Multiplex (TDM) traffic over Handover Interface HI3 via a Media Gateway;
- and
- IRI over Handover Interface HI2 using the same CN.
Dependencies are inferred from the claim text.