ETSI TR 102 300-5 V1.4.1 (2015-06)

TECHNICAL REPORT
Terrestrial Trunked Radio (TETRA);
Voice plus Data (V+D);
Designers' guide;
Part 5: Guidance on numbering and addressing

2 ETSI TR 102 300-5 V1.4.1 (2015-06)

Reference
RTR/TCCE-03235
Keywords
addressing, TETRA
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3 ETSI TR 102 300-5 V1.4.1 (2015-06)
Contents
Intellectual Property Rights . 6
Foreword . 6
Modal verbs terminology . 6
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 7
3 Definitions and abbreviations . 8
3.1 Definitions . 8
3.2 Abbreviations . 10
4 Background . 11
4.1 ETO workshop . 11
4.2 Conflict between identities . 11
4.3 Implications . 12
5 Numbers used . 12
5.1 Structure and format of the ITSI . 12
5.1.1 Structure and format . 12
5.1.2 TETRA Mobile Country Code. 13
5.1.3 Multi-Vendor Networks . 13
5.2 Structure and format of the IMSI . 13
5.2.1 Structure and format . 13
5.3 Interworking . 13
5.3.1 General . 13
5.3.2 Interconnection . 14
5.3.3 Migration . 14
5.3.4 E.164 numbers . 14
5.4 Private Numbering Plans . 15
5.4.1 General . 15
5.4.2 RUN (Radio User Number) . 15
5.4.3 FSSN (Fleet Specific Short Number) . 15
5.4.4 SS-SNA (Supplementary Service - Short Number Addressing) . 16
5.4.5 PNP management . 16
5.5 Groups . 16
6 Dialling plans and algorithms . 16
6.1 General . 16
6.2 Mode buttons . 17
6.3 Leading digit . 17
6.4 Emergency numbers . 17
7 Numbering scenarios . 17
7.1 General . 17
7.2 TETRA to TETRA calls in Trunked Mode Operation . 17
7.2.1 General . 17
7.2.2 Private TETRA network . 17
7.2.3 Public TETRA networks . 18
7.3 TETRA to TETRA Direct Mode Operation . 18
7.3.1 DMO individual call . 18
7.3.2 DMO group calls . 18
7.4 TETRA to TETRA migration . 18
7.4.1 PNP . 18
7.4.2 ITSI . 18
7.5 TETRA to public network interworking . 19
7.5.1 Assumptions . 19
7.5.2 Description 1 - SwMI directly connected to the PSTN . 19
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4 ETSI TR 102 300-5 V1.4.1 (2015-06)
7.5.3 Description 2 - via PABX . 19
8 TETRA migrated to other mobile technology . 19
8.1 Introduction . 19
8.2 Relating TETRA Mobile Network Codes E.218 to E.212 Mobile Network Codes . 20
8.2.0 General . 20
8.2.1 Translation of E.218 (T)MNC and E.212 MNC . 21
8.2.2 Alignment of E.218 (T)MNC and E.212 MNC . 22
Annex A: Transmission of numbers and addresses over the Air Interface . 25
A.1 Numbering implementations . 25
A.2 TETRA to TETRA calls Trunked Mode Operation . 25
A.2.1 Private TETRA network . 25
A.2.1.1 Current network . 25
A.2.1.2 Shortened dialling to Current TETRA network . 26
A.2.1.3 Relative dialling to home TETRA network . 26
A.2.1.4 Predefined TETRA network . 27
A.2.1.5 Any TETRA network. 27
A.2.1.6 Short number dialling . 28
A.2.1.7 Group call addressing . 29
A.2.2 Public TETRA networks . 29
A.2.2.1 E.164 domain . 29
A.2.2.2 ISDN . 30
A.2.2.3 Group call addressing . 30
A.3 TETRA to TETRA Direct Mode Operation . 30
A.3.1 DMO individual call . 30
A.3.2 DMO group calls . 30
A.4 TETRA to TETRA migration. 30
A.5 TETRA to public network interworking . 31
A.5.1 Description 1 - SwMI directly connected to the PSTN . 31
A.5.2 Description 2 - via PABX . 31
A.5.2.1 PABX . 31
A.6 Summary of address exchange over the air interface . 31
A.7 Data services . 33
A.8 Special numbers . 33
Annex B: Radio User Number . 34
B.1 Service overview . 34
B.2 Radio User Assignment . . 34
B.3 Radio User Number . 34
B.4 Information flows . 35
B.4.0 General . 35
B.4.1 Mobile Station authentication. 35
B.4.2 Radio user authentication . 36
B.4.3 Group communications . 37
B.4.4 Group voice communications . 37
B.4.5 Group SDS/status messaging . 39
B.4.6 Mobile station to mobile station communications . 39
B.4.6.1 General . 39
B.4.6.2 Mobile station to mobile station voice calling . 39
B.4.6.3 Mobile station to mobile station SDS messaging . 41
B.4.7 Mobile station - PTN communications . 41
B.4.7.1 Mobile station to PTN voice calling . 41
B.4.7.2 PTN to mobile station calling . 42
B.4.8 Mobile Station - PSTN communications . 43
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5 ETSI TR 102 300-5 V1.4.1 (2015-06)
B.4.8.1 Mobile Station to PSTN communications . 43
B.4.8.2 PSTN to mobile station communications. 44
Annex C: Fleet Short Specific Numbering . 46
C.1 Introduction . 46
C.1.1 Purpose . 46
C.1.2 Scope . 46
C.2 Fleet Specific Short Number (FSSN) . 46
C.2.1 Protocol specification documents . 46
C.2.2 Service overview . 46
C.2.3 Needed number conversions. 47
C.2.4 Call to FSSN. 47
C.2.4.1 Individual call . 47
C.2.4.2 Group call . 47
C.2.5 Two tier system . 47
C.3 Signalling examples . 47
C.3.0 General . 47
C.3.1 Individual call using FSSN . 48
C.3.2 Group call within single FSSN domain using FSSN for CPI/TPI . 48
C.3.3 Group call maintenance using FSSN for TPI . 49
C.3.4 Individually and group addressed status messages . 50
C.3.5 Individually and group addressed SDS text messages. 51
Annex D: Pre defined gateway and server addresses . 52
Annex E: Bibliography . 53
Annex F: Change requests . 54
History . 55

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6 ETSI TR 102 300-5 V1.4.1 (2015-06)
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://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.
Foreword
This Technical Report (TR) has been produced by ETSI Technical Committee TETRA and Critical Communications
Evolution (TCCE).
The present document is part 5 of a multi-part deliverable covering TETRA Voice plus Data designer's guide, as
identified below:
ETSI ETR 300-1: "Overview, technical description and radio aspects";
ETSI TR 102 300-2: "Radio channels, network protocols and service performance";
ETSI TR 102 300-3: "Direct Mode Operation (DMO)";
ETSI ETR 300-4: "Network management";
ETSI TR 102 300-5: "Guidance on numbering and addressing".
ETSI TR 102 300-6: "Air-Ground-Air".
NOTE: Part 1 (ETR 300-1) of this multi-part deliverable is in status "historical" and is not maintained.
The present document, in respect to the previous version, reflects an increased understanding about the role of TETRA
numbering E.218 [i.16], and the perception of its relationship with other numbering resources, such as E.212 [i.5],
Public Land Mobile Network codes, and E.164 [i.4], telephone Numbers. The versatility of TETRA numbering to
support implementations that are both public and private has created the need to extend the scope of the present
document by including, in explicit recognition of the versatility, additional concepts such as Private Numbering Plans.
The versatility of TETRA numbering brought with it a number of concerns regarding the impact of its implementation
in a public arena. The changes in the present document are meant to directly address those concerns by advising
implementors how they can best avoid the issues.
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.
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7 ETSI TR 102 300-5 V1.4.1 (2015-06)
1 Scope
The present document gives guidance on TETRA numbering.
The TETRA technology is a method of mobile communication that meets the needs of a broad range of applications. In
order to support these roles it offers an increased range of methods of numbering by comparison with the widely used
GSM technology. Whilst GSM is optimized to carry out a limited range of functions both cheaply and efficiently,
TETRA offers an alternative for those operations for which the requirements are more complex.
The present document offers a summary of:
• The most widely used methods of numbering and addressing which are available in TETRA E.218 [i.16].
• The relationship to the numbering systems of the other major mobile and fixed technologies (E.164 [i.4] and
E.212 [i.5]).
• The manner in which the numbers should be used in private and public applications.
• How the numbers are dialled in various applications of the technology.
Two stage signalling, as described in ETSI ETS 300 392-4-1 [i.2], annex A and DTMF signalling for any purpose as
described in ETSI EN 300 392-2 [i.9], clause 14.5.1.2.5, is outside the scope of the present document.
The User Interfaces that may exist to support the user entering the numbers that may exist are outside the scope of the
present document.
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
reference document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
Not applicable.
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
reference document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI EN 300 392-1: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 1: General network design".
[i.2] ETSI ETS 300 392-4-1: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 4: Gateways basic operation; Sub-part 1: Public Switched Telephone Network (PSTN)".
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8 ETSI TR 102 300-5 V1.4.1 (2015-06)
[i.3] ETSI ETS 300 392-4-2: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 4: Gateways basic operation; Sub-part 2: Integrated Services Digital Network (ISDN)
gateway".
[i.4] Recommendation ITU-T E.164 (1997): "The International Public Telecommunication Numbering
Plan".
[i.5] Recommendation ITU-T E.212: "The International Identification Plan for Mobile Terminals and
Mobile Users".
[i.6] Recommendation ITU-T E.331: "Minimum user-terminal interface for a human user entering
address information into an ISDN terminal".
[i.7] ETSI ETS 300 392-10-7: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 10: Supplementary services stage 1; Sub-part 7: Short number addressing".
[i.8] ETSI ETS 300 392-12-7: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 12: Supplementary services stage 3; Sub-part 7: Short Number Addressing (SNA)".
[i.9] ETSI EN 300 392-2: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 2: Air
Interface (AI)".
[i.10] TTR001-7: "TETRA Memorandum of Understanding (TETRA MoU); TETRA Interoperability
Profile (TIP) version 4, Part 7: Fleet Specific Short Number (FSSN)".
[i.11] Council Decision 91/396/EEC on the introduction of a single European emergency call number.
[i.12] ETSI EN 300 392-5: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D) and Direct
Mode Operation (DMO); Part 5: Peripheral Equipment Interface (PEI)".
[i.13] ETSI EN 300 812: "Terrestrial Trunked Radio (TETRA); Security aspects; Subscriber Identity
Module to Mobile Equipment (SIM-ME) interface".
[i.14] TETRA Memorandum of Understanding (TETRA MoU) TTR001-17: "Radio User Authentication
(RUA)".
[i.15] ETSI EN 300 392-7: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 7: Security".
[i.16] Recommendation ITU-T E.218: "Management of the allocation of terrestrial trunk radio Mobile
Country Codes".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
alignment: means by which the MNC of the ITSI is related to the MNC of the IMSI by both having the same numerical
representation
dialling: action of selecting the number to be used in a communication
dialling algorithm: process that generates the numbering elements required by the signalling protocol based on user
input to the mobile terminal
fleet: set of subscribers organized into a closed user group who can communicate using a private numbering plan
operated within an FSSN domain
Fleet Specific Short Number (FSSN): private number of up to 6 decimal digits allocated to a subscriber to enable
short number dialling to other members of the same FSSN domain
NOTE: An FSSN enables intra and inter-fleet dialling within each FSSN domain. The same FSSN number space
can be re-used in every FSSN domain.
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9 ETSI TR 102 300-5 V1.4.1 (2015-06)
FSSN domain: organization of fleets using a private numbering plan to enable the members to communicate within
their FSSN domain using FSSN dialling
NOTE: Multiple FSSN domains can exist within a single network, each domain using the same FSSN number
space. Calls between FSSN domains are not possible using FSSN dialling.
group: set of individual subscribers for which a GTSI is defined
NOTE: The group is assigned a unique GSSI, which maps to the set of ISSIs. The GSSI is used to address the
entire group during signalling. Individual subscribers can be members of more than one group and groups
can be dynamically created, edited or deleted.
Group Short Subscriber Identity (GSSI): short form TETRA group identity
Group TETRA Subscriber Identity (GTSI): long form TETRA group identity
NOTE: The long form of group identity consists of the (T)MCC + (T)MNC + GSSI.
home network: network where a subscriber has a direct subscription
NOTE: This means that a subscriber identity has been allocated in advance of any network access.
Individual Short Subscriber Identity (ISSI): short form TETRA individual identity
Individual TETRA Subscriber Identity (ITSI): long form TETRA individual identity
NOTE: The long form of individual identity consists of the (T) MCC + (T) MNC + ISSI, refer to
ETSI EN 300 392-1 [i.1] and E.218 [i.16].
International Mobile Subscriber Identity (IMSI): string of decimal digits that identifies a unique mobile terminal or
mobile subscriber internationally
NOTE 1: The number of digits is up to a maximum of 15.
NOTE 2: The IMSI consists of three fields: the MCC, the MNC and the MSIN, refer to E.212 [i.5].
NOTE 3: TETRA uses another number resource than IMSI, refer to E.218 [i.16].
Mobile Subscriber Integrated Services Digital Network (MS-ISDN): E.164 number assigned to a mobile subscriber
number: string of decimal digits
NOTE: Numbers are used to derive a route to a termination point in the network.
private number: number in a private numbering plan used for dialling to another member of a closed user group
private numbering plan: dialling scheme using private numbers for communication between members of a closed user
group
NOTE: The private numbering plan enables total decoupling between a subscriber's private number and ITSI and
between a subscriber's private number and E.218 [i.16] number.
Public Telecommunications Operator (PTO): network operator who offers service to the public in accordance with
the rules of a national administration, and achieves annex II status, as defined in the relevant European Directive
Radio User Number (RUN): private number used in a private numbering plan implemented using the external
subscriber number field
registration: act of becoming an active and recognized TETRA user by exchange of ITSI with the SwMI (Switching
and Management Infrastructure)
Short Subscriber Identity (SSI): network specific portion of a TSI
NOTE 1: An SSI is only unique within one TETRA sub-domain (one TETRA network).
NOTE 2: There are six different types of SSI (see clause 7.2.3 in ETSI EN 300 392-1 [i.1]):
a) Individual SSI (ISSI);
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10 ETSI TR 102 300-5 V1.4.1 (2015-06)
b) Group SSI (GSSI);
c) Alias SSI (ASSI);
d) Un-exchanged SSI (USSI);
e) Visitor Alias SSI ((V)ASSI);
f) Visitor Group SSI ((V)GSSI).
TETRA Mobile Network Identifier (MNI): 24 bit encoded number created by the concatenation of the (T)MCC and
(T)MNC
translation: means by which the MNC of the ITSI is related to the MNC of the IMSI by both having different
numerical representations
transposed FSSN: the SSI obtained by adding the base SSI to the FSSN
NOTE: The default value for the base FSSN is 15 000 000.
two stage dialling: ability to connect to a terminal using a gateway or PABX by first dialling the gateway or PABX and
then dialling a subsequent number
NOTE: This applies to incoming calls.
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
(T)MCC (TETRA) Mobile Country Code
(T)MNC (TETRA) Mobile Network Code
(V)ASSI Visitor Alias Short Subscriber Identity
(V)GSSI Visitor Group Short Subscriber Identity
AGNSS Assisted Global Navigation Satellite System
ASSI Alias Short Subscriber Identity
A-subscriber MS initiating a call
B-subscriber MS receiving a call
CCI Communications Control Interface (dispatcher interface)
CLI Calling Line Identity
CPI Calling Party Identification
DDI Direct Dialled In
DMO Direct Mode Operation
ECTRA European Committee of Telecom Regulatory Authorities
ENF European Numbering Forum
ESN External Subscriber Number
ETO European Telecommunications Office
FSSN Fleet Specific Short Number
GSM Special Mobile Group
GSSI Group Short Subscriber Identity
GTSI Group TETRA Subscriber Identity
GW Gateway
ID IDentity
IMSI International Mobile Subscriber Identifier
ISDN Integrated Services Digital Network
ISI Inter System Interface
ISSI Individual Short Subscriber Identity
ITSI Individual TETRA Subscriber Identity
ITU International Telecommunications Union
MAC Media Access Control
MCC Mobile Country Code
MMI Man Machine Interface
MNC Mobile Network Code
MNI Mobile Network Identifier
MoU Memorandum of Understanding
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11 ETSI TR 102 300-5 V1.4.1 (2015-06)
MS Mobile Station
MSIN Mobile Subscriber Identity Number
MS-ISDN Mobile Subscriber ISDN
NTNA National TETRA Numbering Administrator
PABX Private Automatic Branch Exchange
PBX Private Branch Exchange
PDU Protocol Data Unit
PIN Personal Identification Number
PNP Private Numbering Plan
PSTN Public Switched Telephone Network
PTN Private Telephony Network
PTO Public Telecommunications Operator
RUA Radio User Assignment
RUI Radio User Identity
RUN Radio User Number
SDS Short Data Service
SIM Subscriber Identity Module
SNA Short Number address
SSI Short Subscriber Identity
SS-SNA Supplementary Service - Short Number Addressing
SwMI Switching and Management Infrastructure
TETRA Terrestrial Trunk Radio Access
TIP TETRA Inter-operability Profile
TPI Talking Party Identification
TSI TETRA Subscriber Identity
USSI Un-exchanged Short Subscriber Identity
4 Background
4.1 ETO workshop
The issue of relating TETRA numbering resources to E.212 [i.5] numbering resources was discussed at two workshops
in Copenhagen. Out of the first workshop came the recognition that the two resources were distinct, and that they could
be seen as distinct as long as the technologies did not interact in any way. However, since some operators want to use
dual mode handsets, so that they can support migration on a GSM technology that uses E.212 [i.5] numbering, issues
have been raised about how the numbering regimes for the different technologies should be related to each other. As a
consequence a second workshop was held (Second ETO workshop on TETRA Copenhagen, 12 January, 2000) where
guidance was sought from the regulators via the European Numbering Forum.
The relevant specific actions that the workshop initiated were:
• The workshop requested ENF to monitor the progress of the activity and provide a point for the co-ordination
of the technical and regulatory activities on this subject. In particular ENF can decide to establish a Topic
Group on TETRA to tackle the numbering issues surrounding TETRA as they arise.
• The workshop requested ECTRA to take the appropriate steps to ensure the establishment of harmonized rules
and procedures for the assignment of ITSIs. The workshop identified ECTRA/PT N as the appropriate ECTRA
group to deal with this subject. The ETO report on "Harmonized national conventions for naming and
addressing" was a valid starting point for the ECTRA/PT N work.
• NRAs were asked to develop national conventions for the administration and management of ITSIs used in
public networks.
NOTE: ECTRA PT-N is now known as PT-3.
4.2 Conflict between identities
The following subjects were also discussed in detail at the second ETO workshop in Copenhagen.
If a numerical value assigned to a TETRA identity is also allocated to a different E.212 [i.5] identity there is a potential
for conflict.
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12 ETSI TR 102 300-5 V1.4.1 (2015-06)
This potential for conflict is based on a relationship that was not envisaged in the development of the relevant standards.
A number of assumptions have been made regarding the manner in which TETRA will interwork with GSM and these
assumptions are stated below.
The description of the potential conflict assumes that:
• an allocation of a (T)MCC may be for a country, or group of countries, whilst the same digits in E.212 [i.5] are
allocated to a different geographic country;
• the TETRA operator has stored the (T)MCC either in the handset, or in a standard or modified SIM card;
• the modified SIM card is based on those used for GSM; and
• either the handset or the SIM card is used in a country other than the one in which the number was assigned,
i.e. it has migrated (called roamed in GSM).
4.3 Implications
The relationship between the E.212 [i.5] IMSI and the TETRA ITSI E.218 [i.16] raises a number of issues, not least
because unlike the IMSI, the ITSI, in some circumstances, can be dialled. The co-existence of the two different schemes
raises a number of issues for which guidance is given in the present document. The present document provides the
guidance for implementers of TETRA networks in which numbering plans have to exist. Co-existence of TETRA
Numbering resources (ITSIs) with similar resources of other networks is a driver for the inclusion of preferred
alternatives to ITSI dialling.
5 Numbers used
5.1 Structure and format of the ITSI
5.1.1 Structure and format
The structure of ITSI is shown in figure 1, refer to ETSI EN 300 392-1 [i.1] and E.218 [i.16].
(T)MCC (T)MNC ISSI
10 bits - 14 bits - 24 bits -
3 digits max. 4 digits max. 8 digits

ITSI
Maximum of 15 decimal digits
(T)MCC (TETRA) Mobile Country Code
(T)MNC (TETRA) Mobile Network Code
ISSI Individual Short Subscriber Identity
ITSI Individual TETRA Subscriber Identity

Figure 1: Structure and Format of ITSI
The Individual TETRA Subscriber Identity (ITSI) is the globally unique identity assigned to a TETRA subscriber to
enable the subscriber to roam among private and public TETRA networks. The ITSI is used as the calling and called
party address within the TETRA signalling. It also enables a visited TETRA network to query a TETRA subscriber's
home network for subscription and billing information.
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13 ETSI TR 102 300-5 V1.4.1 (2015-06)
5.1.2 TETRA Mobile Country Code
The TETRA Mobile Country Code, (T)MCC, is administered on an international basis in order to ensure that there is no
risk that different countries adopt the same country code. ETSI Project TETRA requested that the group of
organizations and administrations who had signed the TETRA Memorandum of Understanding (MoU) should
administer the (T)MCCs. The TETRA MoU decided to align the (T)MCCs with the E.212 [i.5] Mobile Country Codes
in order to reduce the potential for confusion. In 2002, the TETRA MoU requested that the ITU should manage the
(T)MCCs to ensure that there will be no conflict of allocation. In 2004, the ITU-T published recommendation
E.218 [i.16] that defines internationally the allocation of E.218 [i.16] (T)MCCs for TETRA.
5.1.3 Multi-Vendor Networks
TETRA has seven open interfaces including one between SwMIs. The link between the SwMIs is called the ISI. Using
the ISI it will be possible to build a TETRA network of SwMIs is from equipment from more than one manufacturer.
TETRA does not specify any intra system interface [i.1]. The advantage is that suppliers of infrastructure are able to
develop infrastructures that are optimized for different applications within the market.
The administration of the TETRA Mobile Network Codes is within the decision of the National TETRA Regulatory
Authority for TETRA. The administrators will need to be aware that there are conditions under which the provision of
more than one TETRA Mobile Network Code to an operator may become necessary. It is possible to construct TETRA
networks from equipment from more than one supplier in which the SSI range is divided such that the equipment from
one supplier uses one range and that from the other supplier uses the other range. In this manner the ISI may link the
networks together an
...