ETSI TS 102 677 V1.1.1 (2019-07)

Lawful Interception (LI); Dynamic Triggering of Interception

DTS/LI-00058

General Information

• Status: Published
• Publication Date: 29-Jul-2019
• Technical Committee: LI - Lawful Interception
• Current Stage: 12 - Completion
• Due Date: 08-Oct-2015
• Completion Date: 30-Jul-2019

Standards Content (Sample)

ETSI TS 102 677 V1.1.1 (2019-07)






TECHNICAL SPECIFICATION
Lawful Interception (LI);
Dynamic Triggering of Interception

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2 ETSI TS 102 677 V1.1.1 (2019-07)



Reference
DTS/LI-00058
Keywords
dynamic triggering, lawful interception, security

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3 ETSI TS 102 677 V1.1.1 (2019-07)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
Introduction . 4
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 6
3 Definition of terms, symbols and abbreviations . 7
3.1 Terms . 7
3.2 Symbols . 8
3.3 Abbreviations . 8
4 Overview of Dynamic Triggering . 9
4.1 Reference architecture . 9
4.1.1 Dynamic triggering functions and interfaces . 9
4.1.2 Link to interface X1 . 9
4.1.3 Integration with traditional LI . 10
4.2 Illustrative use-case . 10
5 Message Specification . 11
5.1 Introduction . 11
5.2 Minimum message contents . 11
5.3 Field semantics . 11
6 Security. 12
6.1 Threats and countermeasures . 12
6.2 Channel and message security . 12
Annex A (informative): General implementation notes . 13
A.1 Architecture . 13
A.2 Presentation and transport . 13
Annex B (normative): Base profile . 14
Annex C (informative): Change Request History . 15
History . 16

ETSI

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4 ETSI TS 102 677 V1.1.1 (2019-07)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Lawful Interception (LI).
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
Introduction
The present document describes in high level terms an architecture for the lawful interception of dynamically-allocated
flows in a secondary communications domain, triggered by the activity of permanent identities in a primary domain.
Examples of this include:
• SIP/SDP for VoIP call set-up and a proxy for the RTP sessions.
• A VoIP STUN/TURN/ICE server and one or more networks when traffic goes peer-to-peer.
• OAuth enabled logins in one service authenticated by another.
• Messaging platforms which enable file transfer via the cloud.
• S8HR and similar roaming scenarios.
• Systems with strong control/user plane separation.
The architecture aims to separate logic in the primary domain into that which understands the primary domain protocol
(the Triggering Originating Function, TOF) and that which provides LI functions and connectivity (the Triggering
Control Function, TCF1). This potential reduces the implementation of primary domain LI to the implementation of
domain-specific TOF functionality along with interfaces to a commodity, domain-agnostic, TCF1.
ETSI

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5 ETSI TS 102 677 V1.1.1 (2019-07)
Dynamic triggering as defined in the present document is intended to be able to complement the use of ETSI
TS 103 221-1 [2], X1 interface specification, where X1 has been used to arm basic interception on non-dynamic
identifiers in the primary domain.
The present document is independent of the particular communications technology or protocol in any signalling or
transport plane, or layer or slice of a network.
Implementation notes of particular relevance to 3GPP networks are provided in an informative annex; normative
implementation profiles should be described in separate technology-specific documents.
Outline triggering solutions already exist for specific technologies, for example the IMS Voice and S8HR VPLMN
Roamer scenarios described in ETSI TS 133 107 [1]. The present document is consistent with those scenarios and
provides a unified basis for future triggering solutions, whilst also offering much of the logical detail necessary for
interoperability between differing technologies (for example, an over-the-top application server triggering LI on media
carried by a mobile network operator).


ETSI

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6 ETSI TS 102 677 V1.1.1 (2019-07)
1 Scope
The present document defines an architecture for the lawful interception of dynamically-allocated flows in a secondary
communications domain, triggered by the activity of permanent identities in a primary domain.
Dynamic triggering as defined in the present document is intended to be able to handle a service that is handled by more
than one CSP or network (for example one CSP handling the communication set up and another CSP handling the
content exchange).
The present document is applicable only where national legal frameworks permit it. Issues concerning national legal
frameworks are out of scope.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI TS 133 107: "Universal Mobile Telecommunications System (UMTS); LTE; Digital cellular
telecommunications system (Phase 2+) (GSM); 3G security; Lawful interception architecture and
functions (3GPP TS 33.107)".
[2] ETSI TS 103 221-1: "Lawful Interception (LI); Part 1: Internal Network Interface X1 for Lawful
Interception".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long-term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
Not applicable.
ETSI

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7 ETSI TS 102 677 V1.1.1 (2019-07)
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
deactivation: cessation of lawful interception in an LI function directly as a result of actions by the administration
function in relation to a warrant
dynamic triggering: dissemination of an interception obligation for a certain target's communication between network
elements
NOTE: Typically, these network functions will belong to the same network, and be under the control of a single
network operator. Alternatively, the interception obligation may pass from one network operator to
another network operator within the same jurisdiction. The network functions may have been supplied by
different vendors.
dynamic triggering command: message sent between functions involved in dynamic triggering to invoke, modify,
maintain or revoke DT LI
point of intercept: network function, comprised of physical and logical locations within the network, responsible for
the isolation and access of the content of communication and intercepts related information
EXAMPLE: In the case where Dynamic Triggering is enabled in a network, the POIs interface with the
Triggering Origination and Triggering Receiving Functions to transmit or receive target identities
and other information which enable Dynamic Triggering to occur.
primary domain: communications domain within which targets' long-term identities are present, and from which
dynamic triggers for LI are generated into the secondary domain
EXAMPLE: A SIP service / IMS signalling.
primary domain Triggering Control Function (TCF): function handling LI matching and triggering functions in the
primary domain
primary identity: long-term identifier for a communicant in the primary domain, e.g. their SIP URI
primary session: communications in the primary domain containing targets' primary identities
EXAMPLE: A SIP session between explicitly-listed SIP URIs.
secondary domain: communications domain that conveys dynamically-addressed content, and into which dynamic
triggers for LI are sent
EXAMPLE: The mobile network infrastructure over which RTP (IMS media) flows.
secondary flow: communications in the secondary domain associated with a particular primary session, for example the
RTP packets associated to a particular SDP/SIP session
NOTE: The secondary flow is addressed in the
...