SIST ES 201 671 V2.1.1:2003
(Main)Telecommunications security; Lawful Interception (LI); Handover interface for the lawful interception of telecommunications traffic
- Abstract
Revision of ES 201 671 to support IP-based and other new telecommunications technologies.
- Status
- Published
- Publication Date
- 30-Jun-2003
- Technical Committee
- SPN - Services and Protocols for Networks
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Jul-2003
- Due Date
- 01-Jul-2003
- Completion Date
- 01-Jul-2003
SIST ES 201 671 V2.1.1:2003 is the Slovenian version of the ETSI standard for lawful interception handover in telecommunications. It specifies how a network operator, access provider or service provider delivers administrative information, intercept related information and content of communication to a law enforcement agency under lawful authorization.
This revision extends the handover interface concept to support IP-based and other new telecommunications technologies. It is written for organizations that must implement, operate or receive lawful interception in real networks.
What does SIST ES 201 671 V2.1.1:2003 specify?
SIST ES 201 671 V2.1.1:2003 specifies a generic handover interface for lawful interception between the network side and the LEA side. The standard separates the interface into three logical ports so that administrative data, intercept related information and content of communication can be handled independently.
The scope covers the generic information flow, the procedures and information elements, and the network or service specific protocols for switched circuit and packet data services. The document is organized into a main body with general requirements and six normative or informative annexes that add technology specific rules, coding details and alternative delivery methods.
| Annex | What it covers |
|---|---|
| Annex A | Circuit switched network handover, including circuit switched identifiers, HI2 records, HI3 content delivery and supplementary service procedures |
| Annex B | Packet switched network handover, including packet switched identifiers, HI2 and HI3 aspects, and GPRS technology |
| Annex C | HI2 delivery mechanisms and procedures, including ROSE and FTP |
| Annex D | Structure and coding of data at the handover interface, including ASN.1 modules |
| Annex E | Use of sub-address and calling party number to carry correlation information |
| Annex F | GPRS HI3 interface, including correlation header and FTP transfer details |
| Annex G | LEMF requirements for handling unrecognized fields and parameters |
| Annex H | Bibliography |
What are the key requirements of SIST ES 201 671 V2.1.1:2003?
Interface structure and control
SIST ES 201 671 V2.1.1:2003 requires the handover interface to be split into HI1, HI2 and HI3. HI1 carries administrative information, HI2 carries intercept related information and HI3 carries content of communication. In practice, this means the operator must keep request handling, signalling data and user content separate so each can be delivered and controlled in the right way.
The standard also requires a complete separation between the administrative part and the technical interception functions. The LEA or LEMF has no direct control over the switching equipment, and activation, deactivation or modification can only be done by the NWO/AP/SvP. That separation matters because it limits operational access to lawful interception changes.
Lawful authorization, target handling and identifiers
Clause 4 states that a lawful authorization must identify the interception subject, the type of information required, the start and stop time, the LEA addresses for CC and or IRI, and other needed information. The standard also requires separate handling when the same target is intercepted for different LEAs, so each measure stays distinct.
Clause 6 introduces two core identifier concepts. The Lawful Interception IDentifier (LIID) is assigned per target identity and used across the handover ports, while the Communication IDentifier (CID) is generated per activity and used to correlate IRI and CC. The CID is made up of the Network IDentifier (NID) and, optionally, the Communication Identity Number (CIN). In practice, these identifiers are what let implementers match records, calls and content correctly.
HI2 information and record handling
Clause 8 requires HI2 to carry intercept related information that comes from normal network signalling and service procedures. The standard says the network should send IRI as soon as it becomes available, and may buffer it temporarily if a data link fails. This matters operationally because IRI is expected to follow the call or service event closely, but short interruptions should not stop delivery altogether.
The standard defines four IRI record types: IRI-BEGIN, IRI-END, IRI-CONTINUE and IRI-REPORT. These record types organize communication events into a transaction for each communication case, while IRI-REPORT covers non-communication related events such as subscriber controlled input. For the reader, this means the receiving system can process call progress and service events in a structured way instead of as one long stream.
HI2 delivery methods and encoding
Annex C defines two delivery methods for HI2: ROSE and FTP. The standard says at least one must be provided according to national requirements. Clause 5.2 and Annex D require HI2 data to be coded with ASN.1 and BER, which gives a common machine readable format for both sides.
Annex C also describes operation handling, timing and authentication for ROSE, and file naming and transfer behavior for FTP. In practice, implementers choose the delivery path that fits their network and operational model, then build the sender and receiver to the same coding rules.
HI3 content delivery
Clause 9 requires HI3 to carry the content of communication as a transparent en-clair copy of the intercepted communication flow. The content may be voice or data, and for circuit switched cases the annexes describe separate handling for the two directions of the communication. This matters because the receiving facility must be able to reconstruct what was actually carried, without the network modifying the content.
The standard also allows correlation between HI2 and HI3 by embedding common reference fields in both streams. That is important when the operator must connect a content stream with the matching IRI record set for the same target activity.
Performance, quality and security
Clause 10 says buffered IRI should be held for as short a time as possible, and the quality of the interception result should be at least equal to the quality of the original content. Clause 11 lists the security properties needed for lawful intercept transport: confidentiality, integrity, authentication and availability. The clause explains these in practical terms and points to cryptographic methods such as encryption and hashing.
What terms does SIST ES 201 671 V2.1.1:2003 define?
LIID - The Lawful Interception IDentifier is the operator-assigned identifier for a target identity and is used across HI1, HI2 and HI3.
CID - The Communication IDentifier distinguishes one target activity from another and is used to correlate IRI with CC.
NID - The Network IDentifier is part of the CID and identifies the network side of the communication.
CIN - The Communication Identity Number is the optional second part of the CID.
CC - Content of Communication is the actual intercepted communication content delivered to the LEA side.
IRI - Intercept Related Information is the signalling, service and location information associated with the target’s telecommunications activity.
HI1, HI2, HI3 - These are the three handover interface ports for administrative information, intercept related information and content of communication.
Who uses SIST ES 201 671 V2.1.1:2003?
SIST ES 201 671 V2.1.1:2003 is used by network operators, access providers and service providers that have to implement lawful interception. It is also used by LEAs and their technical support teams when they define what data they need, where it should be delivered and how it should be correlated.
The standard is relevant to engineers who design mediation functions, transport links and record formats, and to quality or compliance teams that verify lawful interception workflows. It is also useful for organizations working with circuit switched, packet switched, GSM, GPRS or TETRA-related interception paths, because the annexes give technology specific guidance.
What changed in SIST ES 201 671 V2.1.1:2003 from the previous edition?
SIST ES 201 671 V2.1.1:2003 is a revision of ES 201 671 that adds support for IP-based and other new telecommunications technologies. The scope also makes the handover interface more generic by covering both switched circuit and packet data environments.
Which standards are used with SIST ES 201 671 V2.1.1:2003?
The standard builds on several ETSI and ITU-T documents:
- ETSI ETR 331 [1] - user requirements for lawful interception from the LEA point of view.
- ETSI ES 201 158 [2] - network functions and the general LI architecture.
- ETSI ETR 330 [3] - legislative and regulatory background.
- ETSI EN 300 356 [5] and ETSI EN 300 403-1 [6] - ISUP and DSS1 signalling used for circuit switched parameter coding.
- ETSI EN 300 061-1 [10], EN 300 097-1 [14], EN 300 138-1 [17], EN 300 185-1 [19], EN 300 188-1 [20] and EN 300 122-1 [39] - supplementary service and keypad signalling referenced in the LI procedures.
- ITU-T X.680 [33], X.690 [34], X.880 [35], X.881 [36] and X.882 [37] - ASN.1, BER and ROSE used for the HI coding and operations.
What does the SIST ES 201 671 V2.1.1:2003 document contain?
The document contains procedure descriptions, record structures, ASN.1 definitions and protocol mappings for lawful interception handover. Annex D gives the detailed syntax for HI1, HI2 and HI3 data, including the object tree, management operations, IRI structures, user data packet transfer and UUS1 content.
It also contains technology specific mapping tables for circuit switched and packet switched services, including supplementary service handling, correlation fields and event-to-parameter mappings. Annex C adds ROSE and FTP procedures for HI2, while Annex F adds GPRS HI3 transfer formats, correlation headers and TLV-based file content.
For implementers, the most useful parts are the message and field definitions, the correlation rules between target identifiers and communication identifiers, the service specific procedures, and the security and timing notes that affect how the intercept data is delivered in real systems.
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Frequently Asked Questions
SIST ES 201 671 V2.1.1:2003 is a standardization document published by the Slovenian Institute for Standardization (SIST). Its full title is "Telecommunications security; Lawful Interception (LI); Handover interface for the lawful interception of telecommunications traffic". This standard covers: Revision of ES 201 671 to support IP-based and other new telecommunications technologies.
Revision of ES 201 671 to support IP-based and other new telecommunications technologies.
SIST ES 201 671 V2.1.1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.030 - Telecommunication services. Applications. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST ES 201 671 V2.1.1:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2003
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: ES 201 671 Version 2.1.1
ICS:
33.030 Telekomunikacijske Telecommunication services.
uporabniške rešitve Applications
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
ETSI Standard
Telecommunications security;
Lawful Interception (LI);
Handover interface for the lawful interception of
telecommunications traffic
2 ETSI ES 201 671 V2.1.1 (2001-09)
Reference
RES/SEC-003009
Keywords
data, handover, interface, security, speech
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No part may be reproduced except as authorized by written permission.
The copyright and the foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 2001.
All rights reserved.
ETSI
3 ETSI ES 201 671 V2.1.1 (2001-09)
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.14
4 General requirements.16
4.1 Basic principles for the handover interface .16
4.2 Legal requirements.17
4.3 Functional requirements.17
5 Overview of handover interface.17
5.1 Handover Interface port 1 (HI1).18
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).19
6 Specific identifiers for LI .19
6.1 Lawful Interception IDentifier (LIID).19
6.2 Communication IDentifier (CID) .20
6.2.1 Network IDentifier (NID).20
6.2.2 Communication Identity Number (CIN) - optional .20
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 .21
8 HI2: Interface port for intercept related information.21
8.1 Data transmission protocols .22
8.1.1 Application for IRI (HI2 information) .22
8.2 Types of IRI records.22
9 HI3: Interface port for content of communication .23
10 Performance and quality.23
10.1 Timing.23
10.2 Quality.23
11 Security aspects.23
11.1 Security properties.23
11.2 Security mechanisms.24
12 Quantitative aspects.24
Annex A (normative): Circuit switched network handover.25
A.1 specific identifiers for LI.25
A.1.1 CC link identifier (CCLID) .25
A.1.2 Circuit switched LI correlation between CC and IRI .25
A.1.3 Usage of Identifiers .26
A.2 HI1: interface port for administrative state .26
A.3 HI2: interface port for IRI .26
A.3.1 Definition of Intercept Related Information.26
A.3.2 Structure of IRI records.27
ETSI
4 ETSI ES 201 671 V2.1.1 (2001-09)
A.3.2.1 Control information for HI2.27
A.3.2.2 Basic call information.28
A.3.2.3 Information on supplementary services, related to a call in progress .28
A.3.2.4 Information on non call related supplementary services.29
A.3.3 Selection of parameters for IRI records.29
A.3.4 Coding of parameters in IRI records .31
A.3.5 Information content of the IRI record types .32
A.4 HI3: interface port for Content of Communication.32
A.4.1 Delivery of Content of Communication .32
A.4.2 Delivery of packetized Content of Communication (general).33
A.4.3 Control information for Circuit switched content of communication .34
A.4.4 Exception Handling.35
A.4.4.1 Failure of CC links.35
A.4.4.2 Fault reporting.35
A.4.5 Security requirements at the interface port HI3.35
A.4.5.1 LI access verification.36
A.4.5.2 Access protection.36
A.4.5.3 Authentication.36
A.5 LI procedures for circuit switched supplementary services .36
A.5.1 General.36
A.5.2 CC link Impact .39
A.5.3 IRI Impact, General Principle for Sending IRI records.39
A.5.4 Multi party calls - general principles, options A, B.39
A.5.4.1 CC links for active and non-active calls (option A).40
A.5.4.2 Reuse of CC links for active calls (option B) .40
A.5.5 Subscriber Controlled Input (SCI): Activation/Deactivation/Interrogation of Services.41
A.6 Detailed procedures for circuit switched supplementary services.41
A.6.1 Advice of Charge services (AOC).41
A.6.2 Call Waiting.41
A.6.2.1 Call Waiting at target: CC links.41
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.42
A.6.3.1 CC links for active and non-active calls (option A).42
A.6.3.2 Reuse of CC links for active calls (option B) .42
A.6.3.3 IRI records.42
A.6.3.3.1 Invocation of Call Hold or Retrieve by target.42
A.6.3.3.2 Invocation of Hold or Retrieve by other parties.42
A.6.4 Explicit Call Transfer .42
A.6.4.1 Explicit Call Transfer, CC link .42
A.6.4.2 Explicit Call Transfer, IRI records.43
A.6.5 Calling Line Identification Presentation (IRI Records).43
A.6.5.1 Call originated by target (target is served user) .43
A.6.5.2 Call terminated at target (other party is served user) .43
A.6.6 Calling Line Identification Restriction (CLIR) .43
A.6.7 COnnected Line Identification Presentation (COLP).43
A.6.7.1 Call terminated at target (target is served user) .43
A.6.7.2 Call originated by target (other party is served user).43
A.6.8 COnnected Line Identification Restriction (COLR).43
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).44
A.6.11.1 CONFerence calls, add On: CC links .44
A.6.11.2 Conference calls: IRI records.44
A.6.12 Three Party Service (Conference) .44
A.6.12.1 CC links.44
A.6.12.2 Three Party Service, IRI Records .44
A.6.13 Meet-Me Conference (MMC).44
A.6.14 Direct Dialling In (DDI).45
ETSI
5 ETSI ES 201 671 V2.1.1 (2001-09)
A.6.15 Multiple Subscriber Number (MSN).45
A.6.16 Diversion Services (DIV).45
A.6.16.1 Call Diversion by Target.45
A.6.16.1.1 Call Diversion by Target, CC links.45
A.6.16.1.2 Call Diversion by Target, IRI records.45
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.46
A.6.18 Void.46
A.6.19 Malicious Call IDentification (MCID).46
A.6.20 SUBaddressing (SUB).46
A.6.21 Terminal Portability (TP) .46
A.6.21.1 CC links.46
A.6.21.2 IRI records.46
A.6.21.2.1 Invocation of Terminal Portability by target.46
A.6.21.2.2 Invocation of Terminal Portability by other parties .46
A.6.22 User-to-User Signalling (UUS) .46
A.6.23 Abbreviated Address (AA).47
A.6.24 Fixed Destination Call (FDC) .47
A.6.25 Alarm Call (AC)/Wake Up Service (WUS) .47
A.6.26 Incoming Call Barring (ICB).47
A.6.27 Outgoing Call Barring (OCB) .47
A.6.28 Completion of Calls on No Reply (CCNR).47
A.6.29 Reverse Charging.47
A.6.30 Line Hunting.47
A.6.31 Message Wait Indication (MWI).47
A.6.32 Name display.47
A.6.33 Tones, Announcements.48
A.7 Fixed network technologies annex.48
A.8 GSM circuit switched technology annex.48
A.8.1 Functional architecture.48
A.8.2 Correlation of CC and IRI (see clause 6) .49
A.8.3 HI3 (Delivery of CC) .49
A.8.4 HI2 (Delivery of IRI) .49
A.9 TETRA technology annex.50
Annex B (normative): Packet switched network handover.51
B.1 Specific identifiers for LI .51
B.2 HI1: interface port for administrative state .51
B.3 HI2: interface port for IRI .51
B.3.1 Definition of Interception Related Information for Packet Switched.51
B.3.2 Exception Handling.51
B.3.3 Security aspect.51
B.4 HI3: interface port for content of communication.51
B.5 GPRS technology annex.52
B.5.1 Functional architecture.52
B.5.2 Correlation.53
B.5.2.1 Correlation of the present document ID's to GSM ID's .53
B.5.2.2 GPRS LI correlation between CC and IRI.53
B.5.3 HI2 (Delivery of IRI) .53
B.5.4 HI3 (Delivery of CC) .54
Annex C (normative): HI2 Delivery mechanisms and procedures.55
C.1 ROSE.55
C.1.1 Architecture.55
C.1.2 ASE_HI procedures.56
ETSI
6 ETSI ES 201 671 V2.1.1 (2001-09)
C.1.2.1 Sending part.56
C.1.2.2 Receiving part.57
C.1.2.3 Data link management.57
C.1.2.3.1 Data link establishment .58
C.1.2.3.2 Data link release.58
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 (this clause is informative only).60
C.2.4 File content.62
C.2.5 Exceptional procedures.62
C.2.6 Other Considerations.62
Annex D (normative): Structure of data at the handover interface .64
D.1 Syntax definitions.64
D.2 Object tree.65
D.3 HI management operation.66
D.4 LI management notification.67
D.5 Intercept related information (HI2) .69
D.6 User data packet transfer (HI3 interface) .82
D.7 TETRA data transfer (HI3 interface) .84
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.86
E.1 Introduction.86
E.2 Subaddress options.86
E.3 Subaddress coding.86
E.3.1 BCD Values.87
E.3.2 Field order and layout.87
E.4 Field coding.89
E.4.1 Direction.90
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.95
F.3.2.4 CC contents for FTP .96
ETSI
7 ETSI ES 201 671 V2.1.1 (2001-09)
F.3.2.4.1 Fields.96
F.3.2.4.2 Information element syntax.97
F.3.2.5 Other Considerations.98
Annex G (informative): LEMF requirements - handling of unrecognized fields and
parameters.100
Annex H (informative): Bibliography.101
History .103
ETSI
8 ETSI ES 201 671 V2.1.1 (2001-09)
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://www.etsi.org/legal/home.htm).
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 ETSI Standard (ES) has been produced by ETSI Technical Committee Security (SEC).
ETSI
9 ETSI ES 201 671 V2.1.1 (2001-09)
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 (see [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.
[1] ETSI ETR 331: "Security Techniques Advisory Group (STAG); Definition of user requirements
for lawful interception of telecommunications; Requirements of the 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".
[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.
ETSI
10 ETSI ES 201 671 V2.1.1 (2001-09)
[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] Void.
[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] Void.
[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.
[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] Void.
[32] ETSI ETS 300 974: "Digital cellular telecommunications system (Phase 2+) (GSM); Mobile
Application Part (MAP) specification (GSM 09.02)".
ETSI
11 ETSI ES 201 671 V2.1.1 (2001-09)
[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] Void.
[41] Void.
[42] ETSI TS 101 509: "Digital cellular telecommunications system (Phase 2+) (GSM);
Lawful interception; Stage 2 (GSM 03.33)".
[43] ETSI TS 100 927: "Digital cellular telecommunications system (Phase 2+) (GSM); Numbering,
addressing and identification (GSM 03.03)".
[44] Void.
[45] ETSI TS 101 347: "Digital cellular telecommunications system (Phase 2+) (GSM); General Packet
Radio Service (GPRS); GPRS Tunnelling Protocol (GTP) across the Gn and Gp Interface
(3GPP TS 09.60)".
[46] RFC 959: "File Transfer Protocol (FTP)".
[47] Void.
[48] ITU-T recommendation Q.763: "Signalling System No.7 - ISDN User Part formats and codes".
[49] ETSI TS 101 393: "Digital cellular telecommunications system (Phase 2+) (GSM); General Packet
Radio Service (GPRS); GPRS Charging (GSM 12.15)".
[50] Void.
[51] RFC 791: "Internet Protocol".
[52] RFC 793: "Transmission Control Protocol".
[53] Void.
[54] ETSI ETS 300 089: "Integrated Services Digital Network (ISDN); Calling Line Identification
Presentation (CLIP) supplementary service; Service descri
...