SIST-TS ETSI/TS 101 671 V2.8.1:2005

• Abstract:

  Revision of TS 101 671 to include modifications according to the Change Request process.

• Status: Published
• Publication Date: 30-Apr-2005
• ICS: 33.020 - Telecommunications in general
• Technical Committee: SPN - Services and Protocols for Networks
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-May-2005
• Due Date: 01-May-2005
• Completion Date: 01-May-2005
• Ref Project: ETSI TS 101 671 V2.8.1 (2003-11) - Telecommunications security; Lawful Interception (LI); Handover interface for the lawful interception of telecommunications traffic

SIST-TS ETSI/TS 101 671 V2.8.1:2005 is the Slovenian version identical to ETSI TS 101 671 Version 2.8.1, a technical specification on lawful interception handover for telecommunications traffic. It specifies the generic Handover Interface between a Network Operator, Access Provider or Service Provider (NWO/AP/SvP) and a Law Enforcement Agency (LEA), including how administrative information, Intercept Related Information (IRI) and Content of Communication (CC) are exchanged. In practice, it is the document used when the interception interface, correlation rules, and delivery method need to be defined on both the operator side and the LEA side.

What does SIST-TS ETSI/TS 101 671 V2.8.1:2005 specify?

SIST-TS ETSI/TS 101 671 V2.8.1:2005 specifies the generic Handover Interface for lawful interception and the procedures and information elements that support it. It is written as a common framework for future telecommunications networks and services, with network- and service-specific detail added for circuit-switched and packet-data environments.

The document is organized around the three HI ports that separate administration, signalling data and content delivery. The body covers scope, references, definitions and abbreviations, general requirements, an overview of HI1-HI3, identifiers, HI1, HI2, HI3, performance and quality, security aspects, and quantitative aspects.

Annex	What it covers
Annex A	Normative circuit-switched network handover, including identifiers, HI1-HI3 behavior, supplementary services and circuit-switched technology cases
Annex B	Normative packet-switched network handover, including correlation number handling and GPRS-related behavior
Annex C	Normative HI2 delivery mechanisms and procedures, including ROSE and FTP
Annex D	Normative data structure and ASN.1 coding for HI1, HI2 and HI3
Annex E	Informative use of sub-address and calling party number for correlation information
Annex F	Informative GPRS HI3 interface, including correlation and delivery methods
Annex G	Informative handling of unrecognized fields and parameters for the LEMF
Annex H	Informative bibliography
Annex I	Informative Change Request history

What are the key requirements of SIST-TS ETSI/TS 101 671 V2.8.1:2005?

SIST-TS ETSI/TS 101 671 V2.8.1:2005 requires the Handover Interface to keep administrative handling, signalling-derived information and intercepted content logically separate. That separation matters because it limits who can control interception functions and makes the delivery of IRI and CC easier to correlate without mixing their purposes.

Three-port structure and control separation

Clause 5 defines three ports: HI1 for administrative information, HI2 for IRI, and HI3 for CC. The LEA has no direct control over the NWO/AP/SvP equipment, and activation, deactivation or modification of interception in the switching function stays with the NWO/AP/SvP. In practice, this means the operational request path and the interception-data path are intentionally separated.

Lawful authorization and HI1 handling

Clause 4.3 and clause 7 require the lawful authorization to state the interception subject, whether IRI or both IRI and CC are needed, the start and stop time, and the destination addresses for HI2 and HI3. Clause 7.1 lists the minimum activation information, including the target identity, LIID, duration, delivery addresses and authorization reference. Clause 7.2 requires LI notifications after activation, deactivation, modification and certain exceptional situations, so the LEA can track the status of the measure.

HI2 delivery of IRI

Clause 8 requires HI2 to carry all IRI, meaning the signalling and service information associated with the target identity. The document says IRI is sent as soon as possible after the relevant information is available, encoded with ASN.1 and BER, and delivered using standardized data communication methods such as ROSE or FTP. Clause 8.2 defines four record types - IRI-BEGIN, IRI-END, IRI-CONTINUE and IRI-REPORT - which in practice give the implementer a lifecycle for each communication case or non-communication event.

LIID, CID and correlation

Clause 6 defines the LIID and CID as the main identifiers for lawful interception correlation. The LIID identifies the interception measure for a target identity and is agreed between the LEA and the NWO/AP/SvP; the CID identifies an activity of the target identity and correlates IRI records with CC connections. Annex A adds the CCLID for circuit-switched networks, and Annex B defines a packet-switched correlation number that is unique per PDP context. This is what lets the receiving side match the right metadata to the right content stream.

HI3 delivery of content

Clause 9 requires HI3 to transport a transparent en-clair copy of the intercepted communication. Annex A explains that, for circuit-switched traffic, two communication channels are needed for the two directions, and the network does not record or store the CC. Annex A also uses CLIP and COLP checks for access verification at HI3, which in practice helps confirm that the delivered content comes from the expected call path.

Technology-specific procedures

Annex A covers circuit-switched supplementary services and their effect on LI, including call waiting, hold, retrieve, explicit call transfer, conference, diversion, user-to-user signalling, barring and message waiting. Annex B covers packet-switched handover, including the correlation number and GPRS event mapping. This matters because the IRI and CC handling changes when services are invoked or when the target is in a packet session rather than a call.

Performance, quality and security

Clause 10 says buffered IRI should be held for as short a time as possible, and the quality of interception output should be at least equal to the quality of the original CC. Clause 11 describes the security properties of confidentiality, integrity, authentication and availability, and names encryption, hashing and asymmetric cryptography as possible mechanisms. In practice, implementers need a transport design that protects the data and still delivers it in near real time.

What terms does SIST-TS ETSI/TS 101 671 V2.8.1:2005 define?

SIST-TS ETSI/TS 101 671 V2.8.1:2005 defines the following key terms and abbreviations:

• Law Enforcement Agency (LEA) - the organization authorized by national law to request interception and receive the results.
• Lawful Interception IDentifier (LIID) - the identifier agreed between the LEA and the NWO/AP/SvP that labels a target interception measure.
• Communication IDentifier (CID) - the identifier used to distinguish one target activity from another and to correlate IRI with CC.
• Intercept Related Information (IRI) - information associated with the target’s communications, such as signalling, timestamps and related service data.
• Content of Communication (CC) - the actual information exchanged between users, excluding IRI.
• Handover Interface (HI) - the interface family that carries LI information between the operator side and the LEA side.
• Mediation Function (MF) - the function that delivers interception data toward the LEMF.
• Internal Interception Function (IIF) - the internal network function that generates CC and IRI at the network side.

Who uses SIST-TS ETSI/TS 101 671 V2.8.1:2005?

SIST-TS ETSI/TS 101 671 V2.8.1:2005 is used by telecommunications operators, access providers and service providers that have to implement lawful interception handover. It is also used by their interception-platform and mediation-function designers, because it tells them how to split the administrative, signalling and content paths.

LEAs and their technical receiving environments use it to understand what data should arrive on HI1, HI2 and HI3 and how that data is correlated. It is relevant in fixed, circuit-switched, packet-switched and GPRS-oriented implementations, especially where supplementary services, packet sessions or content delivery choices affect the interception workflow.

What changed in SIST-TS ETSI/TS 101 671 V2.8.1:2005 from the previous edition?

SIST-TS ETSI/TS 101 671 V2.8.1:2005 is a revision of TS 101 671 that incorporates modifications made through the Change Request process. Annex I records the Change Request history.

Which standards are used with SIST-TS ETSI/TS 101 671 V2.8.1:2005?

SIST-TS ETSI/TS 101 671 V2.8.1:2005 relies on companion LI documents and protocol standards for its requirements, coding and delivery methods.

Reference	What it contributes
ETSI TS 101 331	LEA requirements that define the interception user viewpoint
ETSI ES 201 158	Network functions and the general LI architecture
ETSI ETR 330	Legislative and regulatory environment guidance
ETSI EN 300 356	ISUP signalling and several circuit-switched parameter formats
ETSI EN 300 403-1	DSS1 basic call control, subaddressing and related signalling coding
ETSI ETS 300 974	GSM MAP parameter coding and mobility-related information
ITU-T Recommendation X.680	ASN.1 abstract syntax notation
ITU-T Recommendation X.690	BER encoding rules
ITU-T Recommendation X.880	Remote Operations concepts used by ROSE
ITU-T Recommendation Q.850	Cause and location coding for release and related events
ITU-T Recommendation Q.931	Basic call control and bearer capability coding
ITU-T Recommendation E.164	Numbering plan for directory numbers
IETF RFC 791	Internet Protocol for packet delivery
IETF RFC 793	Transmission Control Protocol for packet delivery
IETF RFC 2543	SIP handling in packet-switched contexts
ETSI TS 129 060	GPRS tunnelling protocol used in packet-switched delivery
ETSI TS 100 940	GSM radio interface layer 3 signalling
ETSI TS 101 109	Geographical area description used for location-related data

What does the SIST-TS ETSI/TS 101 671 V2.8.1:2005 document contain?

SIST-TS ETSI/TS 101 671 V2.8.1:2005 contains the technical structure needed to implement lawful interception handover, not just a general description of the concept. Annex D gives the ASN.1 object tree and the coded definitions for HI management, HI1 notifications, HI2 IRI, HI3 user-data transfer and CC link data.

It also contains the delivery procedures for ROSE and FTP in Annex C, including data-link test and file-handling behavior. Annex A and Annex B provide the technology-specific procedure sets for circuit-switched and packet-switched cases, while Annex E and Annex F show alternative correlation approaches and GPRS HI3 delivery methods.

The document includes many tables, record definitions and coded fields for identifiers, party information, timestamps, service events, location data, GPRS events and error handling. Those details are the parts an implementer uses when building, testing or integrating an LI mediation and handover system.

SLOVENSKI STANDARD
01-maj-2005
7HOHNRPXQLNDFLMVNDYDUQRVW±=DNRQLWRSUHVWUH]DQMH/,±,]URþLOQLYPHVQLN]D
]DNRQLWRSUHVWUH]DQMHWHOHNRPXQLNDFLMVNHJDSURPHWD
Telecommunications security; Lawful Interception (LI); Handover interface for the lawful
interception of telecommunications traffic
Ta slovenski standard je istoveten z: TS 101 671 Version 2.8.1
ICS:
33.020 Telekomunikacije na splošno Telecommunications in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

Technical Specification
Telecommunications security;
Lawful Interception (LI);
Handover interface for the lawful interception of
telecommunications traffic
2 ETSI TS 101 671 V2.8.1 (2003-11)

Reference
RTS/LI-00009
Keywords
data, handover, interface, security, speech
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ETSI
3 ETSI TS 101 671 V2.8.1 (2003-11)
Contents
Intellectual Property Rights.8
Foreword.8
1 Scope.9
2 References.9
3 Definitions and abbreviations.12
3.1 Definitions.12
3.2 Abbreviations.15
4 General requirements.17
4.1 Basic principles for the Handover Interface .17
4.2 Legal requirements.17
4.3 Functional requirements.18
5 Overview of Handover Interface.18
5.1 Handover Interface port 1 (HI1).19
5.1.1 Manual interface.20
5.1.2 Electronic interface.20
5.2 Handover Interface port 2 (HI2).20
5.3 Handover Interface port 3 (HI3).20
6 Specific identifiers for LI .20
6.1 Lawful Interception IDentifier (LIID).21
6.2 Communication IDentifier (CID) .21
6.2.1 Network IDentifier (NID).21
6.2.2 Communication Identity Number (CIN) - optional .22
7 HI1: Interface port for administrative information.22
7.1 Information for the activation of lawful interception .22
7.2 LI notifications towards the LEMF .23
8 HI2: Interface port for Intercept Related Information.23
8.1 Data transmission protocols .23
8.1.1 Application for IRI (HI2 information) .23
8.2 Types of IRI records.24
9 HI3: Interface port for Content of Communication.24
10 Performance and quality.24
10.1 Timing.24
10.2 Quality.25
11 Security aspects.25
11.1 Security properties.25
11.2 Security mechanisms.25
12 Quantitative aspects.26
Annex A (normative): Circuit switched network handover .27
A.1 Specific identifiers for LI .27
A.1.1 CC Link IDentifier (CCLID).27
A.1.2 Circuit switched LI correlation between CC and IRI .27
A.1.3 Usage of Identifiers .28
A.2 HI1: interface port for administrative state .28
A.3 HI2: interface port for IRI .28
A.3.1 Definition of Intercept Related Information.28
A.3.2 Structure of IRI records.29
ETSI
4 ETSI TS 101 671 V2.8.1 (2003-11)
A.3.2.1 Control information for HI2.29
A.3.2.2 Basic call information.30
A.3.2.3 Information on Supplementary Services, related to a call in progress.30
A.3.2.4 Information on non-call related Supplementary Services .31
A.3.3 Selection of parameters for IRI records.31
A.3.4 Coding of parameters in IRI records .33
A.3.5 Information content of the IRI record types .33
A.4 HI3: interface port for Content of Communication.34
A.4.1 Delivery of Content of Communication .34
A.4.2 Delivery of packetized Content of Communication (general).35
A.4.3 Control information for circuit switched Content of Communication.35
A.4.4 Exception handling.37
A.4.4.1 Failure of CC links.37
A.4.4.2 Fault reporting.37
A.4.5 Security requirements at the interface port HI3.37
A.4.5.1 LI access verification.37
A.4.5.2 Access protection.38
A.4.5.3 Authentication.38
A.5 LI procedures for circuit switched supplementary services .38
A.5.1 General.38
A.5.2 CC link Impact .40
A.5.3 IRI impact, general principle for sending IRI records.41
A.5.4 Multi party calls - general principles, options A, B.41
A.5.4.1 CC links for active and non-active calls (option A).42
A.5.4.2 Reuse of CC links for active calls (option B) .42
A.5.5 Subscriber Controlled Input (SCI): Activation/Deactivation/Interrogation of services .43
A.6 Detailed procedures for circuit switched supplementary services.43
A.6.1 Advice of Charge services (AOC).43
A.6.2 Call Waiting (CW) .43
A.6.2.1 Call Waiting at target: CC links.43
A.6.2.2 Call Waiting: IRI records.43
A.6.2.2.1 Target is served user.43
A.6.2.2.2 Other party is served user.43
A.6.3 Call Hold/Retrieve.44
A.6.3.1 CC links for active and non-active calls (option A).44
A.6.3.2 Reuse of CC links for active calls (option B) .44
A.6.3.3 IRI records.44
A.6.3.3.1 Invocation of Call Hold or Retrieve by target.44
A.6.3.3.2 Invocation of Hold or Retrieve by other parties.44
A.6.4 Explicit Call Transfer (ECT).44
A.6.4.1 Explicit Call Transfer, CC link .44
A.6.4.2 Explicit Call Transfer, IRI records.44
A.6.5 Calling Line Identification Presentation (CLIP) (IRI Records).45
A.6.5.1 Call originated by target (target is served user) .45
A.6.5.2 Call terminated at target (other party is served user) .45
A.6.6 Calling Line Identification Restriction (CLIR) .45
A.6.7 COnnected Line identification Presentation (COLP) .45
A.6.7.1 Call terminated at target (target is served user) .45
A.6.7.2 Call originated by target (other party is served user).45
A.6.8 COnnected Line identification Restriction (COLR).45
A.6.9 Closed User Group (CUG) .45
A.6.10 Completion of Call to Busy Subscriber (CCBS) .45
A.6.11 CONFerence call, add-on (CONF).46
A.6.11.1 CONFerence calls, add on: CC links .46
A.6.11.2 Conference calls: IRI records.46
A.6.12 Three Party Service (Conference) .46
A.6.12.1 CC links.46
A.6.12.2 Three Party Service, IRI Records .46
A.6.13 Meet-Me Conference (MMC).46
A.6.14 Direct Dialling In (DDI).46
ETSI
5 ETSI TS 101 671 V2.8.1 (2003-11)
A.6.15 Multiple Subscriber Number (MSN).46
A.6.16 DIVersion services (DIV) .47
A.6.16.1 Call Diversion by target.47
A.6.16.1.1 Call Diversion by target, CC links .47
A.6.16.1.2 Call Diversion by target, IRI records .47
A.6.16.2 Forwarded call terminated at target .47
A.6.16.3 Call from target forwarded .47
A.6.17 Variants of call diversion services.48
A.6.18 Void.48
A.6.19 Malicious Call IDentification (MCID).48
A.6.20 SUBaddressing (SUB).48
A.6.21 Terminal Portability (TP) .48
A.6.21.1 CC links.48
A.6.21.2 IRI records.48
A.6.21.2.1 Invocation of Terminal Portability by target.48
A.6.21.2.2 Invocation of Terminal Portability by other parties .48
A.6.22 User-to-User Signalling (UUS) .48
A.6.23 Abbreviated Address (AA).48
A.6.24 Fixed Destination Call (FDC) .49
A.6.25 Alarm Call (AC)/Wake-Up Service (WUS).49
A.6.26 Incoming Call Barring (ICB).49
A.6.27 Outgoing Call Barring (OCB) .49
A.6.28 Completion of Calls on No Reply (CCNR).49
A.6.29 Reverse charging.49
A.6.30 Line hunting.49
A.6.31 Message Wait Indication (MWI).49
A.6.32 Name display.49
A.6.33 Tones, announcements.50
A.7 Fixed network technologies annex.50
A.8 GSM circuit switched technology annex.50
A.8.1 Functional architecture.50
A.8.2 Correlation of CC and IRI (see clause 6) .51
A.8.3 HI3 (delivery of CC) .51
A.8.4 HI2 (delivery of IRI) .51
A.9 TETRA technology annex.52
Annex B (normative): Packet switched network handover .53
B.1 Specific identifiers for LI .53
B.2 HI1: interface port for administrative state .53
B.3 HI2: interface port for IRI .53
B.3.1 Definition of Interception Related Information for packet switched.53
B.3.2 Exception handling.53
B.3.3 Security aspects.53
B.4 HI3: interface port for Content of Communication.54
B.5 GPRS technology annex.54
B.5.1 Functional architecture.54
B.5.2 Correlation.55
B.5.2.1 Correlation of the present document ID's to GSM ID's .55
B.5.2.2 GPRS LI correlation between CC and IRI.55
B.5.3 HI2 (delivery of IRI) .55
B.5.4 HI3 (Delivery of CC) .56
Annex C (normative): HI2 Delivery mechanisms and procedures .57
C.1 ROSE.57
C.1.1 Architecture.57
C.1.2 ASE_HI procedures.57
ETSI
6 ETSI TS 101 671 V2.8.1 (2003-11)
C.1.2.1 Sending part.57
C.1.2.2 Receiving part.59
C.1.2.3 Data link management.59
C.1.2.3.1 Data link establishment .59
C.1.2.3.2 Data link release.60
C.1.2.4 Handling of unrecognized fields and parameters.60
C.1.3 Profiles.60
C.2 FTP.61
C.2.1 Introduction.61
C.2.2 Usage of the FTP.61
C.2.3 Profiles.62
C.2.4 File content.64
C.2.5 Exceptional procedures.64
C.2.6 Other considerations.64
Annex D (normative): Structure of data at the Handover Interface .66
D.1 Syntax definitions.66
D.2 Object tree.67
D.3 HI management operation.68
D.4 LI management notification.69
D.5 Intercept related information (HI2) .71
D.6 User data packet transfer (HI3 interface) .84
D.7 TETRA data transfer (HI3 interface) .85
D.8 Definition of the UUS1 content associated to the CC link.85
Annex E (informative): Use of sub-address and calling party number to carry correlation
information.87
E.1 Introduction.87
E.2 Subaddress options.87
E.3 Subaddress coding.88
E.3.1 BCD values.88
E.3.2 Field order and layout.88
E.4 Field coding.93
E.4.1 Direction.93
E.4.2 Coding of the Calling Party Number.94
E.5 Length of fields.94
Annex F (informative): GPRS HI3 Interface.95
F.1 Functional architecture.95
F.2 Correlation.95
F.3 HI3 Delivery Content of Communication (CC) .96
F.3.1 GPRS LI correlation header .96
F.3.1.1 Introduction.96
F.3.1.2 Definition of GLIC header.96
F.3.1.3 Exceptional procedure.97
F.3.1.4 Other considerations.98
F.3.2 FTP.98
F.3.2.1 Introduction.98
F.3.2.2 Usage of the FTP .98
F.3.2.3 Exceptional procedures.100
F.3.2.4 CC contents for FTP .100
ETSI
7 ETSI TS 101 671 V2.8.1 (2003-11)
F.3.2.4.1 Fields.100
F.3.2.4.2 Information element syntax.102
F.3.2.5 Other considerations.104
Annex G (informative): LEMF requirements - handling of unrecognized fields and parameters .105
Annex H (informative): Bibliography.106
Annex I (informative): Change Request History.107
History .109

ETSI
8 ETSI TS 101 671 V2.8.1 (2003-11)
Intellectual Property Rights
IPRs essential or potentially essential to the present document 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 (http://webapp.etsi.org/IPR/home.asp).
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.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Lawful Interception (LI).
ETSI
9 ETSI TS 101 671 V2.8.1 (2003-11)
1 Scope
The present document is step 3 of a three-step approach to describe a generic Handover Interface for the provision of
lawful interception from a Network Operator, an Access Provider or a Service Provider (NWO/AP/SvP) to the Law
Enforcement Agencies (LEAs). The provision of lawful interception is a requirement of national law, which is usually
mandatory for the operation of any telecommunication service.
Step 1 contains the requirements for lawful interception from a users (LEAs) point of view and is published in
TS 101 331 [1].
Step 2 describes the derived network functions and the general architecture (or functional model) and is published in
ES 201 158 [2].
The present document specifies:
• the generic flow of information as well as the procedures and information elements, which are applicable to
any future telecommunication network or service;
• the network/service specific protocols relating to the provision of lawful interception at the Handover
Interface, for the following networks/services:
- switched circuit; and
- packet data.
The technologies covered in the present document are: GSM, TETRA, GPRS, ISDN and PSTN.
NOTE 1: Handover for TETRA is not fully developed.
NOTE 2: As new networks and/or services are developed, the present document will be expanded as the relevant
standards become available.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: The numbering of the references is kept in line with the numbering as used in version 1.1.1 and
version 2.1.1 of ES 201 671.
[1] ETSI TS 101 331: "Telecommunications security; Lawful Interception (LI); Requirements of law
enforcement agencies".
[2] ETSI ES 201 158: "Telecommunications security; Lawful Interception (LI); Requirements for
network functions".
[3] ETSI ETR 330: "Security Techniques Advisory Group (STAG); A guide to legislative and
regulatory environment".
[4] Void.
ETSI
10 ETSI TS 101 671 V2.8.1 (2003-11)
[5] ETSI EN 300 356 (all parts): "Integrated Services Digital Network (ISDN); Signalling System
No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface".
[6] ETSI EN 300 403-1 (V1.2.2): "Integrated Services Digital Network (ISDN); Digital Subscriber
Signalling System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call
control; Part 1: Protocol specification [ITU-T Recommendation Q.931 (1993), modified]".
[7] Void.
[8] Void.
[9] Void.
[10] ETSI EN 300 061-1: "Integrated Services Digital Network (ISDN); Subaddressing (SUB)
supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification".
[11] Void.
[12] Void.
[13] Void.
[14] ETSI EN 300 097-1: "Integrated Services Digital Network (ISDN); Connected Line Identification
Presentation (COLP) supplementary service; Digital Subscriber Signalling System No. one
(DSS1) protocol; Part 1: Protocol specification".
[15] Void.
[16] ETSI EN 300 130-1: "Integrated Services Digital Network (ISDN); Malicious Call Identification
(MCID) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification".
[17] ETSI EN 300 138-1: "Integrated Services Digital Network (ISDN); Closed User Group (CUG)
supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification".
[18] Void.
[19] ETSI EN 300 185-1: "Integrated Services Digital Network (ISDN); Conference call, add-on
(CONF) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification".
[20] ETSI EN 300 188-1: "Integrated Services Digital Network (ISDN); Three-Party (3PTY)
supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification".
[21] ETSI EN 300 207-1 (V1.2.5): "Integrated Services Digital Network (ISDN); Diversion
supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification".
[22] Void.
[23] ETSI EN 300 286-1: "Integrated Services Digital Network (ISDN); User-to-User Signalling
(UUS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification".
[24] Void.
[25] ETSI EN 300 369-1 (V1.2.4): "Integrated Services Digital Network (ISDN); Explicit Call Transfer
(ECT) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification".
[26] Void.
[27] Void.
ETSI
11 ETSI TS 101 671 V2.8.1 (2003-11)
[28] Void.
[29] ETSI EN 300 196-1 (V1.2.2): "Integrated Services Digital Network (ISDN); Generic functional
protocol for the support of supplementary services; Digital Subscriber Signalling System No. one
(DSS1) protocol; Part 1: Protocol specification".
[30] Void.
[31] ITU-T Recommendation Q.850: "Usage of cause and location in the Digital Subscriber Signalling
System No. 1 and the Signalling System No. 7 ISDN User Part".
[32] ETSI ETS 300 974: "Digital cellular telecommunications system (Phase 2+) (GSM); Mobile
Application Part (MAP) specification (GSM 09.02)".
[33] ITU-T Recommendation X.680: "Information technology - Abstract Syntax Notation One
(ASN.1): Specification of basic notation".
[34] ITU-T Recommendation X.690: "Information technology - ASN.1 encoding rules: Specification of
Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding
Rules (DER)".
[35] ITU-T Recommendation X.880: "Information technology - Remote Operations: Concepts, model
and notation".
[36] ITU-T Recommendation X.881: "Information technology - Remote Operations: OSI realizations;
Remote Operations Service Element (ROSE) service definition".
[37] ITU-T Recommendation X.882: "Information technology - Remote Operations: OSI realizations;
Remote Operations Service Element (ROSE) pr
...