Lawful intercept in voip network

Added: 05-01-2006
Author: Dave Gladwin
Category: VoIP

Introduction

Legitimacy Intercept (LI) was placed on the need for service providers to provide formal legal due to the availability of personal communication. Existing Public Telephone Network, Lawful Intercept you do physically press using the phone line from the target in response to the approval of Law Enforcement Agency (lea). However, Voice over IP (VoIP) is to facilitate the travel of the end user, so it is easy again sponsoring the interception of the basic physical line intercepts the call.

While needs vary from LI have one to another authority, the same total demand. The LI system must provide transparent interception of traffic and not just a particular subject should be aware of the interception. Services provided to other users should not be affected during the arrest.

Architecture Overview

Although the details of LI may vary from country to country we can express the total demand and also to explain many commonly used terminology. The main purpose of the wireless network to enable communication between individuals; any LI function should be built in the normal tissue will not affect services to individuals. Interface between the PTN and the Law Enforcement Monitoring facility (LEMF) is the standard in the area.

LI is dealing with both products, these are:

Contents of Communication (CC): exactly what it sounds like, sound, video or messaging content.

Related Information intercept (IRI): information about the source and destination of the phone, etc.

European demand is often based Etsi standards. North American CALEA (Communications Assistance for Law Enforcement Act) requires the operator to provide LI. Web design and specifications are based delivery of PacketCable (TM) monitoring model, but very similar architecture.

Key elements in the Public Telecom Network LI

There are three basic network that is required for public access Lawful Intercept you, these are:

Intercept Internal Work (IIF) is located in a network node.

A Mediation Work (MF) between the PTN and LEMF.

A Work Administration (ADMF) to set the command to intercept the PTN.

Internal Labor Intercept (IIF) This is the network node and is responsible for producing Intercept Related Information (IRI) and Content of Communication (CC).

Mediation work (Monday-Friday) Delineates certainly worked for PTN from LEMF. Internal Network to communicate using the interface IIFs (INIS) which can be proprietary. MF communicate in one or more LEMFs through standard interfaces: delivery interface (hi2 and hi3).

Administration Work (ADMF) To handle this job to serve an arrest warrant and communicate with MF IIFs although the Internal Network Interface.

LI in implementing a VoIP Network

One of the main problems when managing a VoIP call from the association of media streams. It is possible that the two rivers can take a different path through the network. In addition, even when they do through the device, may be aware of the relationship between the rivers. Some of the equipment in such a network designed to understand and manage the different media streams associations - session border controllers. Usually located in the network boundaries, they receive the Intercept Related Information and the association of the mainstream media of Transportation content directly from rivers.

Conclusion

Has become clear that VoIP services will be expected to provide Lawful Intercept ability to have a similar experience in the PSTN. The FCC in North America who have the authority and all emergency calls should be made lawful Intercept available. Although not all states mandate of this force, the building remains available public network voice over IP Multimedia Service today or you need to plan a network which is easy enough to implement these services in future control.

Terminology

Work ADMF Administration

CALEA Communications Assistance Law Enforcement Act

Contents CC Communications

Look for European Telecommunications Standards Institute

HI surrender Interface

IIF Internal Intercept Work

THIS internal interface Networks

IRI Intercept Related Information

Lea Law Enforcement Agency

Law enforcement monitoring facility LEMF

LI Lawful Interception is

MF Mediation Work

PSTN Public switched Telephone Network

Public Telecommunications Network PTN

VoIP Voice over IP

References

Look for TS 101 332 v1, 1.1 (2001-08) Telecommunications security; has Lawful Interception (LI) Institute of Law Enforcement Needs Etsi TR 101 943 V1, 1.1 (2001-07) Telecommunications security; has Lawful Interception (LI); draft Interception Architecture Generic networks

Look for TS 101 671 V2, 8.1 (2003-11) Telecommunications security; has Lawful Interception (LI); handover interface for traffic lawful interception of telecommunications

Acc-ESP1 ,5-SP-I01-050128, PacketCable (TM) 1.5 Specification: Electronic Surveillance

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