SIST-TS ETSI/TS 101 671 V2.5.1:2005

• 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 V2.5.1 (2003-01) - Telecommunications security; Lawful Interception (LI); Handover interface for the lawful interception of telecommunications traffic

SIST-TS ETSI/TS 101 671 V2.5.1:2005 is the Slovene adoption of ETSI TS 101 671 V2.5.1 from SIST. It covers the Handover Interface for Lawful Interception (LI) of telecommunications traffic and specifies how a Network Operator, Access Provider or Service Provider hands interception results to a Law Enforcement Agency (LEA) and its Law Enforcement Monitoring Facility (LEMF).

What does SIST-TS ETSI/TS 101 671 V2.5.1:2005 specify?

SIST-TS ETSI/TS 101 671 V2.5.1:2005 specifies the generic information flow, procedures and information elements for LI at the Handover Interface, together with network- and service-specific protocols for different communication technologies. The standard organizes LI into three logical ports - HI1 for administrative information, HI2 for Intercept Related Information (IRI), and HI3 for Content of Communication (CC) - so that operational requests, signaling data and communication content are kept separate in implementation.

The document is structured into general clauses 1 to 12 and normative and informative annexes.

Annex	What it covers
Annex A	Circuit switched network handover
Annex B	Packet switched network handover
Annex C	HI2 delivery mechanisms and procedures
Annex D	Structure of data at the Handover Interface
Annex E	Use of sub-address and calling party number to carry correlation information
Annex F	GPRS HI3 Interface
Annex G	LEMF requirements for handling unrecognized fields and parameters
Annex H	Bibliography
Annex I	Change Request History

What are the key requirements of SIST-TS ETSI/TS 101 671 V2.5.1:2005?

The standard sets out a practical LI handover model that separates administration, signaling-derived interception data and communication content. In practice, this means operators and equipment suppliers must design the interception path so that LEA requests are handled independently from the technical delivery of IRI and CC.

HI1, HI2 and HI3 have distinct roles

Clause 5 and clause 7 state that HI1 carries administrative information, HI2 carries IRI, and HI3 carries CC. HI1 may be manual or electronic, but the LEA/LEMF has no direct control over switching equipment, and only the NWO/AP/SvP can activate, deactivate or modify interception in the network. That separation matters because it keeps lawful authorization handling distinct from network control.

Lawful authorization drives what is activated

Clause 4.3 requires the lawful authorization to state the interception subject, the start and stop time, whether IRI, CC or both are required, the destination addresses for HI2 and HI3, and other network-dependent parameters. The standard also says different LEAs may intercept the same subject and that those measures must be strictly separated. In practice, operators need a way to keep multiple warrants, destinations and target services distinct.

LIID and CID provide correlation

Clause 6 defines the Lawful Interception IDentifier (LIID) and the Communication IDentifier (CID). The LIID is assigned for each target identity and used in HI2 and HI3 to identify the interception measure, while the CID distinguishes individual activities of that target and links IRI records with CC connections. This is the core of correlation: without these identifiers, the LEA cannot reliably match signaling data to a specific intercepted communication.

HI2 delivers IRI as records and timing matters

Clause 8 says HI2 carries IRI such as signaling information, timestamps and, when available, supplementary service or location information. The document defines four IRI record types: IRI-BEGIN, IRI-END, IRI-CONTINUE and IRI-REPORT. For operators, that means the interception platform must report communication setup, progress, release and non-communication-related events in a way the LEMF can process as one transaction per communication case.

HI3 delivers CC as a transparent copy

Clause 9 requires HI3 to deliver a transparent en-clair copy of the intercepted communication. For circuit switched communications, Annex A states that both directions are carried and that two communication channels are needed for stereo transmission. The network does not record or store the CC. In practice, HI3 is the live content feed, not an archive.

Delivery and encoding are standardized

Clause 8.1 and Annex C define two delivery methods for HI2: ROSE and FTP. Annex D specifies ASN.1 and BER coding for the data at the Handover Interface, and it also defines the object tree used for LI operations. This matters for implementation because interoperability depends on using the same encoding and delivery conventions at both the network side and the LEMF side.

Performance, quality and security are part of the design

Clause 10 says buffered IRI should be held for as short a time as possible and that the interception result should have at least the same quality of service as the original CC. Clause 11 lists the security properties of a secure channel as confidentiality, integrity, authentication and availability, and it describes encryption and hashing as example mechanisms. In practice, the interception path must be timely, understandable and protected against unauthorized access or tampering.

Technology annexes adapt the generic model

Annex A adapts the handover model to circuit switched networks, including a large set of supplementary services and their effect on CC links and IRI. Annex B adapts it to packet switched networks and defines packet-switched-specific correlation. Annex F gives a GPRS-oriented HI3 model with its own correlation and delivery options. This means the document is not only generic guidance - it also shows how LI handover is applied in specific network types.

What terms does SIST-TS ETSI/TS 101 671 V2.5.1:2005 define?

• LIID - The Lawful Interception IDentifier assigned to a target identity and used to identify the interception measure across HI1, HI2 and HI3.
• CID - The Communication IDentifier used to distinguish one intercepted activity from another and to correlate IRI with CC.
• CC - Content of Communication, meaning the information exchanged between users, excluding IRI.
• IRI - Intercept Related Information, meaning signaling and related data linked to the target’s communication activity.
• HI - Handover Interface, the physical and logical interface used to request interception and deliver results.
• LEMF - Law Enforcement Monitoring Facility, the designated destination for interception results for a particular subject.
• LEA - Law Enforcement Agency, the authority that requests interception measures and receives the results.
• NWO/AP/SvP - Network Operator, Access Provider or Service Provider, the organization that implements the interception capability and hands over the data.

Who uses SIST-TS ETSI/TS 101 671 V2.5.1:2005?

SIST-TS ETSI/TS 101 671 V2.5.1:2005 is used by telecom network operators, access providers and service providers that must implement lawful interception interfaces. It is also used by LEAs and LEMFs that receive and process interception results, and by engineers who design mediation functions, correlation logic, delivery mechanisms and data coding.

In practice, the standard is relevant to teams that configure interception activation, map target identities to LIID and CID, deliver IRI and CC, and handle network-specific cases such as ISDN, GSM, GPRS and TETRA-related handover. Quality and compliance staff use it to check that the delivery model, security properties and procedural separation match the LI arrangement agreed with the LEA.

What changed in SIST-TS ETSI/TS 101 671 V2.5.1:2005 from the previous edition?

This version is a revision of TS 101 671 and the scope states that it includes modifications according to the Change Request process. Annex I is the Change Request History, so the document also records that revision trail.

Which standards are used with SIST-TS ETSI/TS 101 671 V2.5.1:2005?

The reference list shows that the document builds on several LI, signaling, encoding and transport standards. Key examples are:

• ETSI TS 101 331 - LEA requirements for lawful interception.
• ETSI ES 201 158 - network functions and the general LI architecture.
• ETSI ETR 330 - legislative and regulatory guidance.
• ASN.1 and BER standards - ITU-T X.680 and ITU-T X.690 for data syntax and encoding.
• Remote Operations - ITU-T X.880 and related ROSE references for HI delivery operations.
• ISDN / DSS1 / ISUP references - for circuit switched call control, supplementary services and numbering-related fields.
• GSM / MAP / GPRS references - for mobile and packet-switched correlation, identifiers and event reporting.
• IETF RFC 793 and IETF RFC 2543 - TCP and SIP as protocol references named in the standard.
• ITU-T E.164 - the international public telecommunication numbering plan.

These references matter because they define the signaling fields, protocol encodings and transport mechanisms that the LI handover data reuses.

What does the SIST-TS ETSI/TS 101 671 V2.5.1:2005 document contain?

The document contains the LI architecture overview, the three-port handover model, identifier rules, delivery methods and technology-specific annexes. Annex D provides ASN.1 structures and object identifiers for HI1, HI2 and HI3 data, while Annex C describes ROSE and FTP delivery procedures for HI2.

It also contains detailed mapping material for circuit switched supplementary services, packet switched correlation and GPRS HI3 delivery. Several annexes include figures and tables that show how identifiers, call states, CC links, event types and file or message headers are encoded for implementation and interoperability testing.

The document is therefore both a protocol specification and an implementation guide for lawful interception handover in telecommunications networks.

SLOVENSKI STANDARD
01-maj-2005
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]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 2.5.1
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 V2.5.1 (2003-01)

Reference
RTS/LI-00006
Keywords
data, handover, interface, security, speech
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ETSI
3 ETSI TS 101 671 V2.5.1 (2003-01)
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.17
5 Overview of Handover Interface.18
5.1 Handover Interface port 1 (HI1).19
5.1.1 Manual interface.19
5.1.2 Electronic interface.19
5.2 Handover Interface port 2 (HI2).19
5.3 Handover Interface port 3 (HI3).20
6 Specific identifiers for LI .20
6.1 Lawful Interception IDentifier (LIID).20
6.2 Communication IDentifier (CID) .20
6.2.1 Network IDentifier (NID).21
6.2.2 Communication Identity Number (CIN) - optional .21
7 HI1: Interface port for administrative information.21
7.1 Information for the activation of lawful interception .21
7.2 LI notifications towards the LEMF .22
8 HI2: Interface port for Intercept Related Information.22
8.1 Data transmission protocols .22
8.1.1 Application for IRI (HI2 information) .23
8.2 Types of IRI records.23
9 HI3: Interface port for Content of Communication.23
10 Performance and quality.24
10.1 Timing.24
10.2 Quality.24
11 Security aspects.24
11.1 Security properties.24
11.2 Security mechanisms.25
12 Quantitative aspects.25
Annex A (normative): Circuit switched network handover.26
A.1 Specific identifiers for LI .26
A.1.1 CC Link IDentifier (CCLID).26
A.1.2 Circuit switched LI correlation between CC and IRI .26
A.1.3 Usage of Identifiers .27
A.2 HI1: interface port for administrative state .27
A.3 HI2: interface port for IRI .27
A.3.1 Definition of Intercept Related Information.27
A.3.2 Structure of IRI records.28
ETSI
4 ETSI TS 101 671 V2.5.1 (2003-01)
A.3.2.1 Control information for HI2.28
A.3.2.2 Basic call information.29
A.3.2.3 Information on Supplementary Services, related to a call in progress.29
A.3.2.4 Information on non-call related Supplementary Services .30
A.3.3 Selection of parameters for IRI records.30
A.3.4 Coding of parameters in IRI records .32
A.3.5 Information content of the IRI record types .32
A.4 HI3: interface port for Content of Communication.33
A.4.1 Delivery of Content of Communication .33
A.4.2 Delivery of packetized Content of Communication (general).34
A.4.3 Control information for circuit switched Content of Communication.34
A.4.4 Exception handling.36
A.4.4.1 Failure of CC links.36
A.4.4.2 Fault reporting.36
A.4.5 Security requirements at the interface port HI3.36
A.4.5.1 LI access verification.36
A.4.5.2 Access protection.37
A.4.5.3 Authentication.37
A.5 LI procedures for circuit switched supplementary services .37
A.5.1 General.37
A.5.2 CC link Impact .40
A.5.3 IRI impact, general principle for sending IRI records.40
A.5.4 Multi party calls - general principles, options A, B.40
A.5.4.1 CC links for active and non-active calls (option A).41
A.5.4.2 Reuse of CC links for active calls (option B) .41
A.5.5 Subscriber Controlled Input (SCI): Activation/Deactivation/Interrogation of services .42
A.6 Detailed procedures for circuit switched supplementary services.42
A.6.1 Advice of Charge services (AOC).42
A.6.2 Call Waiting (CW) .42
A.6.2.1 Call Waiting at target: CC links.42
A.6.2.2 Call Waiting: IRI records.42
A.6.2.2.1 Target is served user.42
A.6.2.2.2 Other party is served user.42
A.6.3 Call Hold/Retrieve.43
A.6.3.1 CC links for active and non-active calls (option A).43
A.6.3.2 Reuse of CC links for active calls (option B) .43
A.6.3.3 IRI records.43
A.6.3.3.1 Invocation of Call Hold or Retrieve by target.43
A.6.3.3.2 Invocation of Hold or Retrieve by other parties.43
A.6.4 Explicit Call Transfer (ECT).43
A.6.4.1 Explicit Call Transfer, CC link .43
A.6.4.2 Explicit Call Transfer, IRI records.43
A.6.5 Calling Line Identification Presentation (CLIP) (IRI Records).44
A.6.5.1 Call originated by target (target is served user) .44
A.6.5.2 Call terminated at target (other party is served user) .44
A.6.6 Calling Line Identification Restriction (CLIR) .44
A.6.7 COnnected Line identification Presentation (COLP) .44
A.6.7.1 Call terminated at target (target is served user) .44
A.6.7.2 Call originated by target (other party is served user).44
A.6.8 COnnected Line identification Restriction (COLR).44
A.6.9 Closed User Group (CUG) .44
A.6.10 Completion of Call to Busy Subscriber (CCBS) .44
A.6.11 CONFerence call, add-on (CONF).45
A.6.11.1 CONFerence calls, add on: CC links .45
A.6.11.2 Conference calls: IRI records.45
A.6.12 Three Party Service (Conference) .45
A.6.12.1 CC links.45
A.6.12.2 Three Party Service, IRI Records .45
A.6.13 Meet-Me Conference (MMC).45
A.6.14 Direct Dialling In (DDI).45
ETSI
5 ETSI TS 101 671 V2.5.1 (2003-01)
A.6.15 Multiple Subscriber Number (MSN).45
A.6.16 DIVersion services (DIV) .46
A.6.16.1 Call Diversion by target.46
A.6.16.1.1 Call Diversion by target, CC links .46
A.6.16.1.2 Call Diversion by target, IRI records .46
A.6.16.2 Forwarded call terminated at target .46
A.6.16.3 Call from target forwarded .46
A.6.17 Variants of call diversion services.47
A.6.18 Void.47
A.6.19 Malicious Call IDentification (MCID).47
A.6.20 SUBaddressing (SUB).47
A.6.21 Terminal Portability (TP) .47
A.6.21.1 CC links.47
A.6.21.2 IRI records.47
A.6.21.2.1 Invocation of Terminal Portability by target.47
A.6.21.2.2 Invocation of Terminal Portability by other parties .47
A.6.22 User-to-User Signalling (UUS) .47
A.6.23 Abbreviated Address (AA).47
A.6.24 Fixed Destination Call (FDC) .48
A.6.25 Alarm Call (AC)/Wake-up Service (WUS).48
A.6.26 Incoming Call Barring (ICB).48
A.6.27 Outgoing Call Barring (OCB) .48
A.6.28 Completion of Calls on No Reply (CCNR).48
A.6.29 Reverse charging.48
A.6.30 Line hunting.48
A.6.31 Message Wait Indication (MWI).48
A.6.32 Name display.48
A.6.33 Tones, announcements.48
A.7 Fixed network technologies annex.49
A.8 GSM circuit switched technology annex.49
A.8.1 Functional architecture.49
A.8.2 Correlation of CC and IRI (see clause 6) .49
A.8.3 HI3 (delivery of CC) .50
A.8.4 HI2 (delivery of IRI) .50
A.9 TETRA technology annex.51
Annex B (normative): Packet switched network handover.52
B.1 Specific identifiers for LI .52
B.2 HI1: interface port for administrative state .52
B.3 HI2: interface port for IRI .52
B.3.1 Definition of Interception Related Information for packet switched.52
B.3.2 Exception handling.52
B.3.3 Security aspects.52
B.4 HI3: interface port for Content of Communication.53
B.5 GPRS technology annex.53
B.5.1 Functional architecture.53
B.5.2 Correlation.54
B.5.2.1 Correlation of the present document ID's to GSM ID's .54
B.5.2.2 GPRS LI correlation between CC and IRI.54
B.5.3 HI2 (delivery of IRI) .54
B.5.4 HI3 (Delivery of CC) .55
Annex C (normative): HI2 Delivery mechanisms and procedures.56
C.1 ROSE.56
C.1.1 Architecture.56
C.1.2 ASE_HI procedures.56
ETSI
6 ETSI TS 101 671 V2.5.1 (2003-01)
C.1.2.1 Sending part.56
C.1.2.2 Receiving part.57
C.1.2.3 Data link management.58
C.1.2.3.1 Data link establishment .58
C.1.2.3.2 Data link release.59
C.1.2.4 Handling of unrecognized fields and parameters.59
C.1.3 Profiles.59
C.2 FTP.59
C.2.1 Introduction.59
C.2.2 Usage of the FTP.59
C.2.3 Profiles.61
C.2.4 File content.63
C.2.5 Exceptional procedures.63
C.2.6 Other considerations.63
Annex D (normative): Structure of data at the Handover Interface.65
D.1 Syntax definitions.65
D.2 Object tree.66
D.3 HI management operation.67
D.4 LI management notification.68
D.5 Intercept related information (HI2) .70
D.6 User data packet transfer (HI3 interface) .83
D.7 TETRA data transfer (HI3 interface) .84
D.8 Definition of the UUS1 content associated to the CC link.84
Annex E (informative): Use of sub-address and calling party number to carry correlation
information.86
E.1 Introduction.86
E.2 Subaddress options.86
E.3 Subaddress coding.87
E.3.1 BCD values.87
E.3.2 Field order and layout.87
E.4 Field coding.89
E.4.1 Direction.89
E.4.2 Coding of the Calling Party Number.90
E.5 Length of fields.90
Annex F (informative): GPRS HI3 Interface.91
F.1 Functional architecture.91
F.2 Correlation.91
F.3 HI3 Delivery Content of Communication (CC) .92
F.3.1 GPRS LI correlation header .92
F.3.1.1 Introduction.92
F.3.1.2 Definition of GLIC header.92
F.3.1.3 Exceptional procedure.93
F.3.1.4 Other considerations.93
F.3.2 FTP.94
F.3.2.1 Introduction.94
F.3.2.2 Usage of the FTP .94
F.3.2.3 Exceptional procedures.96
F.3.2.4 CC contents for FTP .96
ETSI
7 ETSI TS 101 671 V2.5.1 (2003-01)
F.3.2.4.1 Fields.96
F.3.2.4.2 Information element syntax.98
F.3.2.5 Other considerations.99
Annex G (informative): LEMF requirements - handling of unrecognized fields and
parameters.101
Annex H (informative): Bibliography.102
Annex I (informative): Change Request History.103
History .104

ETSI
8 ETSI TS 101 671 V2.5.1 (2003-01)
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).
All published ETSI deliverables shall include information which directs the reader to the above source of information.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Lawful Interception (LI).
ETSI
9 ETSI TS 101 671 V2.5.1 (2003-01)
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.
[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.
[5] ETSI EN 300 356 (all parts): "Integrated Services Digital Network (ISDN); Signalling System
No.7; ISDN User Part (ISUP) version 3 for the international interface".
ETSI
10 ETSI TS 101 671 V2.5.1 (2003-01)
[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.
[28] Void.
ETSI
11 ETSI TS 101 671 V2.5.1 (2003-01)
[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) protocol specification".
[38] Void.
[39] ETSI EN 300 122-1: "Integrated Services Digital Network (ISDN); Generic keypad protocol for
the support of supplementary services; Digital Subscriber Signalling System No. one (DSS1)
protocol; Part 1: Protocol specification".
[40] ETSI ETS 300 392-1: "Terrestrial
...