ETSI_LI Solutions
A communication network operator (land or mobile network, internet...) must, upon request of a legal authority, be able to intercept a communication and provide this authority with the information relative to the interception.
The LI (Lawful Interception) standard, developed by ETSI, defines the information the operator must suplly to the legal authority. This information is formalized by an ASN.1 schema.
uniGone proposes solutions from the ETSI LI API to the mediation gateway to software architects, integrators or developers involved in building Lawful Interception applications.
Java/C# API
ETSI_LI Asn1API is a Java or C# API handling the data defined in the ETSI ASN.1 schema. uniGone provides the Asn1API for all evolutions of the standard.
Many data defined in the ETSI LI ASN.1 schema are making reference to other protocols such as ISUP, MAP, DSS1, SMS (3GPP)... ETSI_LI Asn1API is an enhanced API that allows the decoding of these data. For instance, the content of an SMS can be fully decoded.
Mediation gateway
The communication network generally dedicates a specific component to perform the mediation between the network equipment and the legal authority. On one hand, the component collects the information from the network and on the other hand it must provide the legal authority with it in compliance with the ETSI LI standard. FTP is one way to to provide the information to the authority
uniGone provides a gateway than can enhance the operator mediation component. It provides mediation and routing.
Mediation functions :
- scanning incoming HI2 files in a specific directory;
- information adaptation (after decoding and re-encoding BER files);
- records re-ordering if necessary;
- writing files in a special directory.
Routing function :
- sending the files to the legal authority through FTP;
- saving files in case the link to the authority's server is down and recovery when the link is up again.
Tools
The ETSI ASN.1 schema describes the information an operator must provide to a legal authority requesting a communication interception. This information is not always directly readable by the legal authority.
A mediation is thus necessary to adapt, transform the raw data from the ASN.1 records.
uniGone develops tools to make that mediation.
The tools accept :
- binary files containing the data encoded according the ETSI LI ASN.1 schema and BER;
- text files containing raw data that have been extracted from the ASN.1 records.
The tools can be parameterized to perform the requested mediation :
- decoding of fields of extra standards such as ISUP, DSS1, MAP, SMS...;
- adaptation of some fields;
- particular functions may be developed to achieve specific goals.
The tools provide :
- binary files encoded according to the ASN.1 schema and BER;
- text files (e.g. the csv format allows the reading by a a spreadsheet application).