SIST EN 300 392-3-9 V1.2.1:2020

ETSI EN 300 392-3-9 V1.2.1 (2020-04)






EUROPEAN STANDARD
Terrestrial Trunked Radio (TETRA);
Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI);
Sub-part 9: Transport layer independent, General design

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2 ETSI EN 300 392-3-9 V1.2.1 (2020-04)



Reference
REN/TCCE-03257
Keywords
management, mobility, TETRA
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2020.
All rights reserved.

DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.

3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and
of the oneM2M Partners.
®
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI

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3 ETSI EN 300 392-3-9 V1.2.1 (2020-04)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 7
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 9
3 Definition of terms, symbols and abbreviations . 10
3.1 Terms . 10
3.2 Symbols . 11
3.3 Abbreviations . 11
4 ISI standardization methodology . 12
4.1 3 stage methodology . 12
4.2 Stage Descriptions . 12
4.2.1 Stage 1 description . 12
4.2.2 Stage 2 description . 13
4.2.3 Stage 3 description . 13
4.3 Usage of Specification and Description Language (SDL) . 14
5 TETRA SwMI roles using ISI . 14
5.1 Management configurations . 14
5.1.1 Migration and group attachment configurations . 14
5.1.1.1 SwMI roles for migration and group attachment . 14
5.1.1.2 SwMI databases . 14
5.1.1.3 Migration scenarios . 15
5.1.1.4 Group attachment scenarios . 16
5.1.2 Group linking configurations . 17
5.2 Call processing . 18
5.2.1 Group call processing . 18
5.2.2 Individual call processing . 20
5.2.3 Transit . 21
6 Introduction to ISI ANFs . 21
6.1 ISI ANF Overview . 21
6.2 ANF-ISIMM. 22
6.3 ANF-ISIIC . 22
6.4 ANF-ISIGC . 22
6.5 ANF-ISISDS . 22
6.6 ANF-ISISS . 22
7 ISI Generic Functional Protocol (ISI GFP) . 22
7.1 Protocol model . 22
7.2 Services provided by the conceptual protocol model entities . 23
7.3 Addressing and transport . 24
7.4 ISI GFP requirements and operation definition . 24
7.4.1 General . 24
7.4.2 Result . 27
7.4.3 ReturnError . 27
7.4.4 Reject . 28
7.4.5 Procedures. 28
8 Security related functions the ISI . 30
8.1 Security overview . 30
8.2 ITSI authentication . 30
8.3 End-to-end encryption . 30
8.4 End-to-end key management via ISI . 31
ETSI

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4 ETSI EN 300 392-3-9 V1.2.1 (2020-04)
Annex A (normative): Security - supporting encryption over ISI . 32
A.1 Overview . 32
A.2 Encryption . 33
A.2.1 ISI relation to air interface and end-to-end encryption . 33
A.2.2 Air interface encryption key management via ISI . 33
A.2.2.1 OTAR . 33
A.2.2.2 Secret Key of individual subscriber (K) . 34
A.2.2.3 Derived Cipher Key (DCK) . 34
A.2.2.4 Common Cipher Key (CCK) . 34
A.2.2.5 Static Cipher Key (SCK) . 34
A.2.2.6 Group Cipher Key (GCK) . 34
Annex B (informative): Encoding Example . 35
Annex C (informative): Change requests . 37
History . 38

ETSI

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5 ETSI EN 300 392-3-9 V1.2.1 (2020-04)
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 European Standard (EN) has been produced by ETSI Technical Committee TETRA and Critical Communications
Evolution (TCCE).
The present document is part 3, sub-part 9 of a multi-part deliverable covering the Terrestrial Trunked Radio (TETRA);
Voice plus Data (V+D), as identified below:
Part 1: "General network design";
Part 2: "Air Interface (AI)";
Part 3: "Interworking at the Inter-System Interface (ISI)":
Sub-part 1: "General design";
Sub-part 2: "Additional Network Feature Individual Call (ANF-ISIIC)";
Sub-part 3: "Additional Network Feature Group Call (ANF-ISIGC)";
Sub-part 4: "Additional Network Feature Short Data Service (ANF-ISISDS)";
Sub-part 5: "Additional Network Feature for Mobility Management (ANF-ISIMM)";
Sub-part 6: "Speech format implementation for circuit mode transmission";
Sub-part 7: "Speech Format Implementation for Packet Mode Transmission";
Sub-part 8: "Generic Speech Format Implementation";
Sub-part 9: "Transport layer independent, General design";
Sub-part 10: "General design, PSS1 over E.1";
Sub-part 11: "General design, SIP/IP";
Sub-part 12: "Transport layer independent Additional Network Feature Individual Call (ANF-ISIIC)";
Sub-part 13: "Transport layer independent Additional Network Feature Group Call (ANF-ISIGC)";
Sub-part 14: "Transport layer independent Additional Network Feature Short Data Service (ANF-ISISDS)";
ETSI

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6 ETSI EN 300 392-3-9 V1.2.1 (2020-04)
Sub-part 15: Transport layer independent Additional Network Feature, Mobility Management
(ANF-ISIMM)";
Part 4: "Gateways basic operation";
Part 5: "Peripheral Equipment Interface (PEI)";
Part 7: "Security";
Part 9: "General requirements for supplementary services";
Part 10: "Supplementary services stage 1";
Part 11: "Supplementary services stage 2";
Part 12: "Supplementary services stage 3";
Part 13: "SDL model of the Air Interface (AI)";
Part 14: "Protocol Implementation Conformance Statement (PICS) proforma specification";
Part 15: "TETRA frequency bands, duplex spacings and channel numbering";
Part 16: "Network Performance Metrics";
Part 17: "TETRA V+D and DMO specifications";
Part 18: "Air interface optimized applications";
Part 19: "Interworking between TETRA and Broadband systems".
NOTE 1: Part 3, sub-parts 6 and 7 (Speech format implementation), part 4, sub-part 3 (Data networks gateway),
part 10, sub-part 15 (Transfer of control), part 13 (SDL) and part 14 (PICS) of this multi-part deliverable
are in status "historical" and are not maintained.
NOTE 2: Some parts are also published as Technical Specifications such as ETSI TS 100 392-2 and those may be
the latest version of the document.
The present document is based on ETSI EN 300 392-3-1 "Interworking at the Inter-System Interface (ISI); General
Design" [i.6]. The main differences are:
• Any transport protocol (PSS1) information is removed as several different transport protocols can be used.
• Any reference to ROSE ([i.4] and [i.5]) is removed and the necessary description of the PDU identification has
been added.
• The ASN.1 specification of the PDUs has been re-designed taking into account that the reference to ROSE is
removed.
For all subparts in the TETRA specification ETSI EN 300 392-3 "Interworking at the Inter-System Interface (ISI)" [3],
[4], [5], [6], [7], [8] and [9] the terms ISI and TETRA ISI are equivalent.
National transposition dates
Date of adoption of this EN: 13 November 2019
Date of latest announcement of this EN (doa): 31 July 2020
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 January 2021
Date of withdrawal of any conflicting National Standard (dow): 31 January 2021
ETSI

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7 ETSI EN 300 392-3-9 V1.2.1 (2020-04)
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.
ETSI

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8 ETSI EN 300 392-3-9 V1.2.1 (2020-04)
1 Scope
The present document defines the general aspects of interworking at the Inter-System Interface (ISI) for Terrestrial
Trunked Radio (TETRA) system supporting Voice plus Data (V+D). Those specify the general concepts which are the
basis of the ISI operation between TETRA systems. It introduces the Additional Network Features (ANFs) used at
the ISI, and specifies:
• the general protocol mechanism upon which the definition of each ANF is based; and
• the security related functions over the ISI.
The specification of the general transport layer independent protocol mechanism applies to any TETRA Switching and
Management Infrastructure (SwMI) which supports the ISI. The security requirements for the ISI only apply to SwMIs
which support authentication or end-to-end encryption over the ISI.
Besides the ISI general design, the present sub-part, interworking at the Inter-System Interface comprises the following
other sub-parts:
• General design, PSS1 over E.1 [3];
• General design, SIP/IP [4];
• Transport layer independent Additional Network Feature Individual Call (ANF-ISIIC) [5];
• Transport layer independent Additional Network Feature Group Call (ANF-ISIGC) [6];
• Transport layer independent Additional Network Feature Short Data Service (ANF-ISISDS) [7];
• Transport layer independent Additional Network Feature, Mobility Management (ANF-ISIMM) [8]; and
• Generic Speech Format Implementation [9].
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 1: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
NOTE 2: Note that for the TETRA standards, the reference is always to a European Standard (ETSI EN 300 xxx) if
such has been published, but the latest version of that standard can be either an EN or a Technical
Specification (ETSI TS 100 xxx), even if this is not visible in the reference list.
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 300 392-1: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 1: General network design".
[2] ETSI EN 300 392-2: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 2: Air
Interface (AI)".
[3] ETSI EN 300 392-3-10: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 10: General design, PSS1 over
E.1".
ETSI

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9 ETSI EN 300 392-3-9 V1.2.1 (2020-04)
[4] ETSI EN 300 392-3-11: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 11: General design, SIP/IP".
[5] ETSI EN 300 392-3-12: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 12: Transport Layer Independent
Additional Network Feature Individual Call (ANF-ISIIC)".
[6] ETSI EN 300 392-3-13: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 13: Transport layer independent
Additional Network Feature Group Call (ANF-ISIGC)".
[7] ETSI EN 300 392-3-14: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 14: Transport Layer Independent
Additional Network Feature Short Data Service (ANF-ISISDS)".
[8] ETSI EN 300 392-3-15: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 15: Transport layer independent
Additional Network Feature, Mobility Management (ANF-ISIMM)".
[9] ETSI EN 300 392-3-8: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 8: Generic Speech Format
Implementation".
[10] ETSI EN 302 109: "Terrestrial Trunked Radio (TETRA); Security; Synchronization mechanism
for end-to-end encryption".
[11] ETSI EN 300 392-9: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 9: General requirements for supplementary services".
[12] Recommendation ITU-T X.690: "Information technology - ASN.1 encoding rules: Specification of
Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding
Rules (DER)".
[13] ETSI EN 300 392-7: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 7: Security".
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 1: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
NOTE 2: Note that for the TETRA standards, the reference is always to a European Standard (ETSI EN 300 xxx) if
such has been published, but the latest version of that standard can be either an EN or a Technical
Specification (ETSI TS 100 xxx), even if this is not visible in the reference list.
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.
[i.1] ETSI EN 300 395-1: "Terrestrial Trunked Radio (TETRA); Speech CODEC for full-rate traffic
channel; Part 1: General description of speech functions".
[i.2] Recommendation ITU-T I.130: "Method for the characterization of telecommunication services
supported by an ISDN and network capabilities of an ISDN".
[i.3] Recommendation ITU-T Z.100: "Specification and description language (SDL)".
[i.4] Recommendation ITU-T X.219: "Remote Operations: Model, notation and service definition".
[i.5] Recommendation ITU-T X.229: "Remote Operations: Protocol specification".
ETSI

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10 ETSI EN 300 392-3-9 V1.2.1 (2020-04)
[i.6] ETSI EN 300 392-3-1: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 1: General design".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
call independent: property of information which is conveyed between SwMI on a signalling connection which is not
related to an audio call
call independent signalling connection: signalling connection established between ANF-ISI entities located in
different Switching and Management Infrastructures that is not related to audio calls
destination SwMI: Switching and Management Infrastructure where the receiving ANF-ISI entity is located (in the
context of a single one-way exchange of information between two ANF-ISI entities located in different Switching and
Management Infrastructures)
Group TETRA Subscriber Identity (GTSI): TETRA Subscriber Identity assigned to a group
home SwMI: home of the MS's ITSI, i.e. the SwMI where the network code (MNC) is equal to that of the individual
subscriber (ITSI)
invocation: action taken by the user or by the service provider to execute a specific service function within real time
ISI mediation function: entity which provides to different ANF-ISI entities the services that are not supported by the
transport layer protocol
Location Area (LA): area within radio coverage of a base station or group of base stations within which a Mobile
Station (MS) is allowed to operate
Mobile Network Identity (MNI): identity that identify the SwMI
NOTE: It consists of the Mobile Country Code (MCC) and the Mobile Network Code (MNC).
Mobile Station (MS): physical grouping that contains all of the mobile equipment that is used to obtain TETRA
services
NOTE: By definition, a mobile station contains at least one Mobile Radio Stack (MRS).
originating SwMI: in the context of a TETRA call, Switching and Management Infrastructure where the calling user is
registered (which implies that this user is located in that SwMI) or Switching and Management Infrastructure which
originates a Call independent signalling connection
segmentation: act of generating two or more transport layer PDUs derived from one initial ISI PSU
service user: abstract representation of the totality of those entities in a single system that makes use of a service
through a single access point
Short Subscriber Identity (SSI): network specific portion of a TSI
NOTE: A SSI is only unique within one TETRA sub-domain (one TETRA network).
source SwMI: switching and management infrastructure where the sending ANF-ISI entity is located (in the context of
a single one-way exchange of information between two ANF-ISI entities located in different Switching and
Management Infrastructures)
subscriber: user of a telecommunication service, based on a contract with the provider of the service
NOTE 1: The subscriber may be an individual or a group: in the first case it is identified by an ITSI, in the second,
by a GTSI.
ETSI

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11 ETSI EN 300 392-3-9 V1.2.1 (2020-04)
NOTE 2: The individual subscriber is able to access an SwMI either through a MS or Line Station.
supplementary service: service which modifies or supplements a basic bearer service or a basic teleservice
NOTE: A supplementary service cannot be offered to a customer as a stand-alone service. It should be offered in
combination with a bearer service or a teleservice.
Switching and Management Infrastructure (SwMI): all of the TETRA equipment for a Voice plus Data (V+D)
network
terminating SwMI: in the context of a TETRA call, Switching and Management Infrastructure where the called user is
registered (which implies that this user is located in that SwMI) or Switching and Management Infrastructure which
terminates a Call independent signalling connection
TETRA Subscriber Identity (TSI): global TETRA network address that is to identify an individual or a group
subscriber within the domain of all TETRA networks
user: entity using the services of a telecommunications network via an externally accessible service access point
NOTE: An individual user may be a person or an application process.
visited SwMI: TETRA network which MNI is not equal to the user's MNI
3.2 Symbols
Void.
3.3 Abbreviations
For the purposes of the present document
...

Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)






EUROPEAN STANDARD
Terrestrial Trunked Radio (TETRA);
Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI);
Sub-part 9: Transport layer independent, General design

---------------------- Page: 1 ----------------------
2 Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)



Reference
REN/TCCE-03257
Keywords
management, mobility, TETRA
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the
print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2019.
All rights reserved.

TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.
TM TM
3GPP and LTE are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and
of the oneM2M Partners.
®
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI

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3 Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 7
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 9
3 Definition of terms, symbols and abbreviations . 10
3.1 Terms . 10
3.2 Symbols . 11
3.3 Abbreviations . 11
4 ISI standardization methodology . 12
4.1 3 stage methodology . 12
4.2 Stage Descriptions . 12
4.2.1 Stage 1 description . 12
4.2.2 Stage 2 description . 13
4.2.3 Stage 3 description . 13
4.3 Usage of Specification and Description Language (SDL) . 14
5 TETRA SwMI roles using ISI . 14
5.1 Management configurations . 14
5.1.1 Migration and group attachment configurations . 14
5.1.1.1 SwMI roles for migration and group attachment . 14
5.1.1.2 SwMI databases . 14
5.1.1.3 Migration scenarios . 15
5.1.1.4 Group attachment scenarios . 16
5.1.2 Group linking configurations . 17
5.2 Call processing . 18
5.2.1 Group call processing . 18
5.2.2 Individual call processing . 20
5.2.3 Transit . 21
6 Introduction to ISI ANFs . 21
6.1 ISI ANF Overview . 21
6.2 ANF-ISIMM. 22
6.3 ANF-ISIIC . 22
6.4 ANF-ISIGC . 22
6.5 ANF-ISISDS . 22
6.6 ANF-ISISS . 22
7 ISI Generic Functional Protocol (ISI GFP) . 22
7.1 Protocol model . 22
7.2 Services provided by the conceptual protocol model entities . 23
7.3 Addressing and transport . 24
7.4 ISI GFP requirements and operation definition . 24
7.4.1 General . 24
7.4.2 Result . 27
7.4.3 ReturnError . 27
7.4.4 Reject . 28
7.4.5 Procedures. 28
8 Security related functions the ISI . 30
8.1 Security overview . 30
8.2 ITSI authentication . 30
8.3 End-to-end encryption . 30
8.4 End-to-end key management via ISI . 31
ETSI

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4 Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)
Annex A (normative): Security - supporting encryption over ISI . 32
A.1 Overview . 32
A.2 Encryption . 33
A.2.1 ISI relation to air interface and end-to-end encryption . 33
A.2.2 Air interface encryption key management via ISI . 33
A.2.2.1 OTAR . 33
A.2.2.2 Secret Key of individual subscriber (K) . 34
A.2.2.3 Derived Cipher Key (DCK) . 34
A.2.2.4 Common Cipher Key (CCK) . 34
A.2.2.5 Static Cipher Key (SCK) . 34
A.2.2.6 Group Cipher Key (GCK) . 34
Annex B (informative): Encoding Example . 35
Annex C (informative): Change requests . 37
History . 38

ETSI

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5 Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)
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 draft European Standard (EN) has been produced by ETSI Technical Committee TETRA and Critical
Communications Evolution (TCCE), and is now submitted for the combined Public Enquiry and Vote phase of the
ETSI standards EN Approval Procedure.
The present document is part 3, sub-part 9 of a multi-part deliverable covering the Terrestrial Trunked Radio (TETRA);
Voice plus Data (V+D), as identified below:
Part 1: "General network design";
Part 2: "Air Interface (AI)";
Part 3: "Interworking at the Inter-System Interface (ISI)":
Sub-part 1: "General design";
Sub-part 2: "Additional Network Feature Individual Call (ANF-ISIIC)";
Sub-part 3: "Additional Network Feature Group Call (ANF-ISIGC)";
Sub-part 4: "Additional Network Feature Short Data Service (ANF-ISISDS)";
Sub-part 5: "Additional Network Feature for Mobility Management (ANF-ISIMM)";
Sub-part 6: "Speech format implementation for circuit mode transmission";
Sub-part 7: "Speech Format Implementation for Packet Mode Transmission";
Sub-part 8: "Generic Speech Format Implementation";
Sub-part 9: "Transport layer independent, General design";
Sub-part 10: "General design, PSS1 over E.1";
Sub-part 11: "General design, SIP/IP";
Sub-part 12: "Transport layer independent Additional Network Feature Individual Call (ANF-ISIIC)";
Sub-part 13: "Transport layer independent Additional Network Feature Group Call (ANF-ISIGC)";
Sub-part 14: "Transport layer independent Additional Network Feature Short Data Service (ANF-ISISDS)";
ETSI

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6 Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)
Sub-part 15: Transport layer independent Additional Network Feature, Mobility Management
(ANF-ISIMM)";
Part 4: "Gateways basic operation";
Part 5: "Peripheral Equipment Interface (PEI)";
Part 7: "Security";
Part 9: "General requirements for supplementary services";
Part 10: "Supplementary services stage 1";
Part 11: "Supplementary services stage 2";
Part 12: "Supplementary services stage 3";
Part 13: "SDL model of the Air Interface (AI)";
Part 14: "Protocol Implementation Conformance Statement (PICS) proforma specification";
Part 15: "TETRA frequency bands, duplex spacings and channel numbering";
Part 16: "Network Performance Metrics";
Part 17: "TETRA V+D and DMO specifications";
Part 18: "Air interface optimized applications";
Part 19: "Interworking between TETRA and Broadband systems".
NOTE 1: Part 3, sub-parts 6 and 7 (Speech format implementation), part 4, sub-part 3 (Data networks gateway),
part 10, sub-part 15 (Transfer of control), part 13 (SDL) and part 14 (PICS) of this multi-part deliverable
are in status "historical" and are not maintained.
NOTE 2: Some parts are also published as Technical Specifications such as ETSI TS 100 392-2 and those may be
the latest version of the document.
The present document is based on ETSI EN 300 392-3-1 "Interworking at the Inter-System Interface (ISI); General
Design" [i.6]. The main differences are:
• Any transport protocol (PSS1) information is removed as several different transport protocols can be used.
• Any reference to ROSE ([i.4] and [i.5]) is removed and the necessary description of the PDU identification has
been added.
• The ASN.1 specification of the PDUs has been re-designed taking into account that the reference to ROSE is
removed.
For all subparts in the TETRA specification ETSI EN 300 392-3 "Interworking at the Inter-System Interface (ISI)" [3],
[4], [5], [6], [7], [8] and [9] the terms ISI and TETRA ISI are equivalent.

Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 6 months after doa

ETSI

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7 Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)
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.
ETSI

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8 Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)
1 Scope
The present document defines the general aspects of interworking at the Inter-System Interface (ISI) for Terrestrial
Trunked Radio (TETRA) system supporting Voice plus Data (V+D). Those specify the general concepts which are the
basis of the ISI operation between TETRA systems. It introduces the Additional Network Features (ANFs) used at
the ISI, and specifies:
• the general protocol mechanism upon which the definition of each ANF is based; and
• the security related functions over the ISI.
The specification of the general transport layer independent protocol mechanism applies to any TETRA Switching and
Management Infrastructure (SwMI) which supports the ISI. The security requirements for the ISI only apply to SwMIs
which support authentication or end-to-end encryption over the ISI.
Besides the ISI general design, the present sub-part, interworking at the Inter-System Interface comprises the following
other sub-parts:
• General design, PSS1 over E.1 [3];
• General design, SIP/IP [4];
• Transport layer independent Additional Network Feature Individual Call (ANF-ISIIC) [5];
• Transport layer independent Additional Network Feature Group Call (ANF-ISIGC) [6];
• Transport layer independent Additional Network Feature Short Data Service (ANF-ISISDS) [7];
• Transport layer independent Additional Network Feature, Mobility Management (ANF-ISIMM) [8]; and
• Generic Speech Format Implementation [9].
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 1: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
NOTE 2: Note that for the TETRA standards, the reference is always to a European Standard (ETSI EN 300 xxx) if
such has been published, but the latest version of that standard can be either an EN or a Technical
Specification (ETSI TS 100 xxx), even if this is not visible in the reference list.
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 300 392-1: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 1: General network design".
[2] ETSI EN 300 392-2: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 2: Air
Interface (AI)".
[3] ETSI EN 300 392-3-10: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 10: General design, PSS1 over
E.1".
ETSI

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9 Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)
[4] ETSI EN 300 392-3-11: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 11: General design, SIP/IP".
[5] ETSI EN 300 392-3-12: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 12: Transport Layer Independent
Additional Network Feature Individual Call (ANF-ISIIC)".
[6] ETSI EN 300 392-3-13: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 13: Transport layer independent
Additional Network Feature Group Call (ANF-ISIGC)".
[7] ETSI EN 300 392-3-14: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 14: Transport Layer Independent
Additional Network Feature Short Data Service (ANF-ISISDS)".
[8] ETSI EN 300 392-3-15: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 15: Transport layer independent
Additional Network Feature, Mobility Management (ANF-ISIMM)".
[9] ETSI EN 300 392-3-8: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 8: Generic Speech Format
Implementation".
[10] ETSI EN 302 109: "Terrestrial Trunked Radio (TETRA); Security; Synchronization mechanism
for end-to-end encryption".
[11] ETSI EN 300 392-9: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 9: General requirements for supplementary services".
[12] Recommendation ITU-T X.690: "Information technology - ASN.1 encoding rules: Specification of
Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding
Rules (DER)".
[13] ETSI EN 300 392-7: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 7: Security".
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 1: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
NOTE 2: Note that for the TETRA standards, the reference is always to a European Standard (ETSI EN 300 xxx) if
such has been published, but the latest version of that standard can be either an EN or a Technical
Specification (ETSI TS 100 xxx), even if this is not visible in the reference list.
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.
[i.1] ETSI EN 300 395-1: "Terrestrial Trunked Radio (TETRA); Speech CODEC for full-rate traffic
channel; Part 1: General description of speech functions".
[i.2] Recommendation ITU-T I.130: "Method for the characterization of telecommunication services
supported by an ISDN and network capabilities of an ISDN".
[i.3] Recommendation ITU-T Z.100: "Specification and description language (SDL)".
[i.4] Recommendation ITU-T X.219: "Remote Operations: Model, notation and service definition".
[i.5] Recommendation ITU-T X.229: "Remote Operations: Protocol specification".
ETSI

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10 Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)
[i.6] ETSI EN 300 392-3-1: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 1: General design".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
call independent: property of information which is conveyed between SwMI on a signalling connection which is not
related to an audio call
call independent signalling connection: signalling connection established between ANF-ISI entities located in
different Switching and Management Infrastructures that is not related to audio calls
destination SwMI: Switching and Management Infrastructure where the receiving ANF-ISI entity is located (in the
context of a single one-way exchange of information between two ANF-ISI entities located in different Switching and
Management Infrastructures)
Group TETRA Subscriber Identity (GTSI): TETRA Subscriber Identity assigned to a group
home SwMI: home of the MS's ITSI, i.e. the SwMI where the network code (MNC) is equal to that of the individual
subscriber (ITSI)
invocation: action taken by the user or by the service provider to execute a specific service function within real time
ISI mediation function: entity which provides to different ANF-ISI entities the services that are not supported by the
transport layer protocol
Location Area (LA): area within radio coverage of a base station or group of base stations within which a Mobile
Station (MS) is allowed to operate
Mobile Network Identity (MNI): identity that identify the SwMI
NOTE: It consists of the Mobile Country Code (MCC) and the Mobile Network Code (MNC).
Mobile Station (MS): physical grouping that contains all of the mobile equipment that is used to obtain TETRA
services
NOTE: By definition, a mobile station contains at least one Mobile Radio Stack (MRS).
originating SwMI: in the context of a TETRA call, Switching and Management Infrastructure where the calling user is
registered (which implies that this user is located in that SwMI) or Switching and Management Infrastructure which
originates a Call independent signalling connection
segmentation: act of generating two or more transport layer PDUs derived from one initial ISI PSU
service user: abstract representation of the totality of those entities in a single system that makes use of a service
through a single access point
Short Subscriber Identity (SSI): network specific portion of a TSI
NOTE: A SSI is only unique within one TETRA sub-domain (one TETRA network).
source SwMI: Switching and Management Infrastructure where the sending ANF-ISI entity is located (in the context of
a single one-way exchange of information between two ANF-ISI entities located in different Switching and
Management Infrastructures)
subscriber: user of a telecommunication service, based on a contract with the provider of the service
NOTE 1: The subscriber may be an individual or a group: in the first case it is identified by an ITSI, in the second,
by a GTSI.
ETSI

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11 Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)
NOTE 2: The individual subscriber is able to access an SwMI either through a MS or Line Station.
supplementary service: service which modifies or supplements a basic bearer service or a basic teleservice
NOTE: A supplementary service cannot be offered to a customer as a stand-alone service. It should be offered in
combination with a bearer service or a teleservice.
Switching and Management Infrastructure (SwMI): all of the TETRA equipment for a Voice plus Data (V+D)
network
terminating SwMI: in the context of a TETRA call, Switching and Management Infrastructure where the called user is
registered (which implies that this user is located in that SwMI) or Switching and Management Infrastructure which
terminates a Call independent signalling connection
TETRA Subscriber Identity (TSI): global TETRA network address that is to identify an individual or a group
subscriber within the domain of all TETRA networks
user: entity using the services of a telecommunications network via an externally accessible service access point
NO
...

SLOVENSKI STANDARD
oSIST prEN 300 392-3-9 V1.2.0:2019
01-november-2019
Prizemni snopovni radio (TETRA) - Govor in podatki (V+D) - 3. del: Medsebojno
delovanje na medsistemskem vmesniku (ISI) - 9. poddel: Neodvisnost transportnih
plasti, splošna zasnova
Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 3: Interworking at the
Inter-System Interface (ISI) - Sub-part 9: Transport layer independent, General design
Ta slovenski standard je istoveten z: ETSI EN 300 392-3-9 V1.2.0 (2019-08)
ICS:
33.070.10 Prizemni snopovni radio Terrestrial Trunked Radio
(TETRA) (TETRA)
oSIST prEN 300 392-3-9 V1.2.0:2019 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 300 392-3-9 V1.2.0:2019

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oSIST prEN 300 392-3-9 V1.2.0:2019
Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)






EUROPEAN STANDARD
Terrestrial Trunked Radio (TETRA);
Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI);
Sub-part 9: Transport layer independent, General design

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oSIST prEN 300 392-3-9 V1.2.0:2019
 2 Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)



Reference
REN/TCCE-03257
Keywords
management, mobility, TETRA
ETSI
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ETSI

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oSIST prEN 300 392-3-9 V1.2.0:2019
 3 Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 7
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 9
3 Definition of terms, symbols and abbreviations . 10
3.1 Terms . 10
3.2 Symbols . 11
3.3 Abbreviations . 11
4 ISI standardization methodology . 12
4.1 3 stage methodology . 12
4.2 Stage Descriptions . 12
4.2.1 Stage 1 description . 12
4.2.2 Stage 2 description . 13
4.2.3 Stage 3 description . 13
4.3 Usage of Specification and Description Language (SDL) . 14
5 TETRA SwMI roles using ISI . 14
5.1 Management configurations . 14
5.1.1 Migration and group attachment configurations . 14
5.1.1.1 SwMI roles for migration and group attachment . 14
5.1.1.2 SwMI databases . 14
5.1.1.3 Migration scenarios . 15
5.1.1.4 Group attachment scenarios . 16
5.1.2 Group linking configurations . 17
5.2 Call processing . 18
5.2.1 Group call processing . 18
5.2.2 Individual call processing . 20
5.2.3 Transit . 21
6 Introduction to ISI ANFs . 21
6.1 ISI ANF Overview . 21
6.2 ANF-ISIMM. 22
6.3 ANF-ISIIC . 22
6.4 ANF-ISIGC . 22
6.5 ANF-ISISDS . 22
6.6 ANF-ISISS . 22
7 ISI Generic Functional Protocol (ISI GFP) . 22
7.1 Protocol model . 22
7.2 Services provided by the conceptual protocol model entities . 23
7.3 Addressing and transport . 24
7.4 ISI GFP requirements and operation definition . 24
7.4.1 General . 24
7.4.2 Result . 27
7.4.3 ReturnError . 27
7.4.4 Reject . 28
7.4.5 Procedures. 28
8 Security related functions the ISI . 30
8.1 Security overview . 30
8.2 ITSI authentication . 30
8.3 End-to-end encryption . 30
8.4 End-to-end key management via ISI . 31
ETSI

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oSIST prEN 300 392-3-9 V1.2.0:2019
 4 Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)
Annex A (normative): Security - supporting encryption over ISI . 32
A.1 Overview . 32
A.2 Encryption . 33
A.2.1 ISI relation to air interface and end-to-end encryption . 33
A.2.2 Air interface encryption key management via ISI . 33
A.2.2.1 OTAR . 33
A.2.2.2 Secret Key of individual subscriber (K) . 34
A.2.2.3 Derived Cipher Key (DCK) . 34
A.2.2.4 Common Cipher Key (CCK) . 34
A.2.2.5 Static Cipher Key (SCK) . 34
A.2.2.6 Group Cipher Key (GCK) . 34
Annex B (informative): Encoding Example . 35
Annex C (informative): Change requests . 37
History . 38

ETSI

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oSIST prEN 300 392-3-9 V1.2.0:2019
 5 Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)
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 draft European Standard (EN) has been produced by ETSI Technical Committee TETRA and Critical
Communications Evolution (TCCE), and is now submitted for the combined Public Enquiry and Vote phase of the
ETSI standards EN Approval Procedure.
The present document is part 3, sub-part 9 of a multi-part deliverable covering the Terrestrial Trunked Radio (TETRA);
Voice plus Data (V+D), as identified below:
Part 1: "General network design";
Part 2: "Air Interface (AI)";
Part 3: "Interworking at the Inter-System Interface (ISI)":
Sub-part 1: "General design";
Sub-part 2: "Additional Network Feature Individual Call (ANF-ISIIC)";
Sub-part 3: "Additional Network Feature Group Call (ANF-ISIGC)";
Sub-part 4: "Additional Network Feature Short Data Service (ANF-ISISDS)";
Sub-part 5: "Additional Network Feature for Mobility Management (ANF-ISIMM)";
Sub-part 6: "Speech format implementation for circuit mode transmission";
Sub-part 7: "Speech Format Implementation for Packet Mode Transmission";
Sub-part 8: "Generic Speech Format Implementation";
Sub-part 9: "Transport layer independent, General design";
Sub-part 10: "General design, PSS1 over E.1";
Sub-part 11: "General design, SIP/IP";
Sub-part 12: "Transport layer independent Additional Network Feature Individual Call (ANF-ISIIC)";
Sub-part 13: "Transport layer independent Additional Network Feature Group Call (ANF-ISIGC)";
Sub-part 14: "Transport layer independent Additional Network Feature Short Data Service (ANF-ISISDS)";
ETSI

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oSIST prEN 300 392-3-9 V1.2.0:2019
 6 Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)
Sub-part 15: Transport layer independent Additional Network Feature, Mobility Management
(ANF-ISIMM)";
Part 4: "Gateways basic operation";
Part 5: "Peripheral Equipment Interface (PEI)";
Part 7: "Security";
Part 9: "General requirements for supplementary services";
Part 10: "Supplementary services stage 1";
Part 11: "Supplementary services stage 2";
Part 12: "Supplementary services stage 3";
Part 13: "SDL model of the Air Interface (AI)";
Part 14: "Protocol Implementation Conformance Statement (PICS) proforma specification";
Part 15: "TETRA frequency bands, duplex spacings and channel numbering";
Part 16: "Network Performance Metrics";
Part 17: "TETRA V+D and DMO specifications";
Part 18: "Air interface optimized applications";
Part 19: "Interworking between TETRA and Broadband systems".
NOTE 1: Part 3, sub-parts 6 and 7 (Speech format implementation), part 4, sub-part 3 (Data networks gateway),
part 10, sub-part 15 (Transfer of control), part 13 (SDL) and part 14 (PICS) of this multi-part deliverable
are in status "historical" and are not maintained.
NOTE 2: Some parts are also published as Technical Specifications such as ETSI TS 100 392-2 and those may be
the latest version of the document.
The present document is based on ETSI EN 300 392-3-1 "Interworking at the Inter-System Interface (ISI); General
Design" [i.6]. The main differences are:
• Any transport protocol (PSS1) information is removed as several different transport protocols can be used.
• Any reference to ROSE ([i.4] and [i.5]) is removed and the necessary description of the PDU identification has
been added.
• The ASN.1 specification of the PDUs has been re-designed taking into account that the reference to ROSE is
removed.
For all subparts in the TETRA specification ETSI EN 300 392-3 "Interworking at the Inter-System Interface (ISI)" [3],
[4], [5], [6], [7], [8] and [9] the terms ISI and TETRA ISI are equivalent.

Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 6 months after doa

ETSI

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oSIST prEN 300 392-3-9 V1.2.0:2019
 7 Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)
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.
ETSI

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oSIST prEN 300 392-3-9 V1.2.0:2019
 8 Draft ETSI EN 300 392-3-9 V1.2.0 (2019-08)
1 Scope
The present document defines the general aspects of interworking at the Inter-System Interface (ISI) for Terrestrial
Trunked Radio (TETRA) system supporting Voice plus Data (V+D). Those specify the general concepts which are the
basis of the ISI operation between TETRA systems. It introduces the Additional Network Features (ANFs) used at
the ISI, and specifies:
• the general protocol mechanism upon which the definition of each ANF is based; and
• the security related functions over the ISI.
The specification of the general transport layer independent protocol mechanism applies to any TETRA Switching and
Management Infrastructure (SwMI) which supports the ISI. The security requirements for the ISI only apply to SwMIs
which support authentication or end-to-end encryption over the ISI.
Besides the ISI general design, the present sub-part, interworking at the Inter-System Interface comprises the following
other sub-parts:
• General design, PSS1 over E.1 [3];
• General design, SIP/IP [4];
• Transport layer independent Additional Network Feature Individual Call (ANF-ISIIC) [5];
• Transport layer independent Additional Network Feature Group Call (ANF-ISIGC) [6];
• Transport layer independent Additional Network Feature Short Data Service (ANF-ISISDS) [7];
• Transport layer independent Additional Network Feature, Mobility Management (ANF-ISIMM) [8]; and
• Generic Speech Format Implementation [9].
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 1: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
NOTE 2: Note that for the TETRA standards, the reference is always to a European Standard (ETSI EN 300 xxx) if
such has been published, but the latest version of that standard can be either an EN or a Technical
Specification (ETSI TS 100 xxx), even if this is not visible in the reference list.
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 300 392-1: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 1: General network design".
[2] ETSI EN 300 392-2: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 2: Air
Interface (AI)".
[3] ETSI EN 300 392-3-10: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 10: General design, PSS1 over
E.1".
ETSI

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[4] ETSI EN 300 392-3-11: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 11: General design, SIP/IP".
[5] ETSI EN 300 392-3-12: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 12: Transport Layer Independent
Additional Network Feature Individual Call (ANF-ISIIC)".
[6] ETSI EN 300 392-3-13: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 13: Transport layer independent
Additional Network Feature Group Call (ANF-ISIGC)".
[7] ETSI EN 300 392-3-14: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 14: Transport Layer Independent
Additional Network Feature Short Data Service (ANF-ISISDS)".
[8] ETSI EN 300 392-3-15: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 15: Transport layer independent
Additional Network Feature, Mobility Management (ANF-ISIMM)".
[9] ETSI EN 300 392-3-8: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 8: Generic Speech Format
Implementation".
[10] ETSI EN 302 109: "Terrestrial Trunked Radio (TETRA); Security; Synchronization mechanism
for end-to-end encryption".
[11] ETSI EN 300 392-9: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 9: General requirements for supplementary services".
[12] Recommendation ITU-T X.690: "Information technology - ASN.1 encoding rules: Specification of
Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding
Rules (DER)".
[13] ETSI EN 300 392-7: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 7: Security".
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 1: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
NOTE 2: Note that for the TETRA standards, the reference is always to a European Standard (ETSI EN 300 xxx) if
such has been published, but the latest version of that standard can be either an EN or a Technical
Specification (ETSI TS 100 xxx), even if this is not visible in the reference list.
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.
[i.1] ETSI EN 300 395-1: "Terrestrial Trunked Radio (TETRA); Speech CODEC for full-rate traffic
channel; Part 1: General description of speech functions".
[i.2] Recommendation ITU-T I.130: "Method for the characterization of telecommunication services
supported by an ISDN and network capabilities of an ISDN".
[i.3] Recommendation ITU-T Z.100: "Specification and description language (SDL)".
[i.4] Recommendation ITU-T X.219: "Remote Operations: Model, notation and service definition".
[i.5] Recommendation ITU-T X.229: "Remote Operations: Protocol specification".
ETSI

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[i.6] ETSI EN 300 392-3-1: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 1: General design".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
call independent: property of information which is conveyed between SwMI on a signalling connection which is not
related to an audio call
call independent signalling connection: signalling connection established between ANF-ISI entities located in
different Switching and Management Infrastructures that is not related to audio calls
destination SwMI: Switching and Management Infrastructure where the receiving ANF-ISI entity is located (in the
context of a single one-way exchange of information between two ANF-ISI entities located in different Switching and
Management Infrastructures)
Group TETRA Subscriber Identity (GTSI): TETRA Subscriber Identity assigned to a group
home SwMI: home of the MS's ITSI, i.e. the SwMI where the network code (MNC) is equal to that of the individual
subscriber (ITSI)
invocation: action taken by the user or by the service provider to execute a specific service function within real time
ISI mediation function: entity which provides to different ANF-ISI entities the services that are not supported by the
transport layer protocol
Location Area (LA): area within radio coverage of a base station or group of base stations within which a Mobile
Station (MS) is allowed to operate
Mobile Network Identity (MNI): identity that identify the SwMI
NOTE: It consists of the Mobile Country Code (MCC) and the Mobile Network Code (MNC).
Mobile Station (MS): physical grouping that contains all of the mobile equipment that is used to obtain TETRA
services
NOTE: By definition, a mobile station contains at least one Mobile Radio Stack (MRS).
originating SwMI: in the context of a TETRA call, Switching and Management Infrastructure where the calling user is
registered (which implies that this user is located in that SwMI) or Switching and Management Infrastructure which
originates a Call independent signalling connection
segmentation: act of generating two or more transport layer PDUs derived from one initial ISI PSU
service user: abstract representation of the totality of those entities in a single system that makes use of a service
through a single access point
Short Subscriber Identity (SSI): network specific portion of a TSI
NOTE: A SSI is only unique within one TETRA sub-domain (one TETRA network).
source SwMI: Switching and Management Infrastructure where the sending ANF-ISI entity is located (in the context of
a single one-way exchange of information between two ANF-ISI entities located in different Switching and
Management Infrastructures)
subscriber: user of a telecommunication service, based on a contract with the provider of the service
NOTE 1: The subscriber may be an
...