SIST ETS 300 392-4-1 E1:2003

SLOVENSKI STANDARD
01-december-2003
Prizemni snopovni radio (TETRA) – Govor in podatki (V+D) – 4. del: Osnovna
operacija pri prehodu – 1. poglavje: Javna komutirana telefonska omrežja (PSTN)
Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 4: Gateways basic
operation; Sub-part 1: Public Switched Telephone Network (PSTN)
Ta slovenski standard je istoveten z: ETS 300 392-4-1 Edition 1
ICS:
33.040.35 Telefonska omrežja Telephone networks
33.070.10 Prizemni snopovni radio Terrestrial Trunked Radio
(TETRA) (TETRA)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 392-4-1
TELECOMMUNICATION January 1999
STANDARD
Source: TETRA Reference: DE/TETRA-03001-04-1
ICS: 33.020
Key words: TETRA, V+D, PSTN
Terrestrial Trunked Radio (TETRA);
Voice plus Data (V+D);
Part 4: Gateways basic operation;
Sub-part 1: Public Switched Telephone Network (PSTN)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Internet: secretariat@etsi.fr - http://www.etsi.org
Tel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16
Copyright Notification: 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 1999. All rights reserved.

Page 2
ETS 300 392-4-1: January 1999
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Standards Making Support Dept." at the address shown on the title page.

Page 3
ETS 300 392-4-1: January 1999
Contents
Foreword .7
1 Scope .9
2 Normative references.9
3 Definitions and abbreviations .10
3.1 Definitions .10
3.2 Abbreviations .10
4 PSTN gateway stage 1 specification.11
4.1 Description.11
4.1.1 General description .11
4.1.2 Qualifications on applicability to telecommunication services.11
4.2 Procedures.11
4.2.1 Provision/withdrawal.11
4.2.2 Normal procedures.11
4.2.2.1 Activation/deactivation/registration/interrogation .11
4.2.2.2 Invocation and operation .11
4.2.3 Exceptional procedures.12
4.2.3.1 Activation/deactivation/registration/interrogation .12
4.2.3.2 Invocation and operation .12
4.3 Interaction with TETRA supplementary services .12
4.3.1 Ambience Listening (SS-AL) .12
4.3.2 Access Priority (SS-AP) .12
4.3.3 Area Selection (SS-AS).12
4.3.4 Barring of Incoming Calls (SS-BIC).12
4.3.5 Barring of Outgoing Calls (SS-BOC).12
4.3.6 Call Authorised by Dispatcher (SS-CAD) .12
4.3.7 Completion of Calls to Busy Subscriber (SS-CCBS).12
4.3.8 Completion of Calls on No Reply (SS-CCNR).13
4.3.9 Call Forwarding Busy (SS-CFB).13
4.3.10 Call Forwarding No Reply (SS-CFNRy) .13
4.3.11 Call Forwarding Not Reachable (SS-CFNRc) .13
4.3.12 Call Forwarding Unconditional (SS-CFU).13
4.3.13 Calling Line Identification Presentation (SS-CLIP).13
4.3.14 Calling/Connected Line Identification Restriction (SS-CLIR) .13
4.3.15 Connected Line Identification Presentation (SS-COLP).13
4.3.16 Call Report (SS-CR).13
4.3.17 Call Retention (SS-CRT).13
4.3.18 Call Waiting (SS-CW) .13
4.3.19 Dynamic Group Number Assignment (SS-DGNA).13
4.3.20 Discreet Listening (SS-DL).13
4.3.21 Call Hold (SS-HOLD) .14
4.3.22 Include Call (SS-IC).14
4.3.23 Late Entry (SS-LE) .14
4.3.24 List Search Call (SS-LSC).14
4.3.25 Priority Call (SS-PC).14
4.3.26 Pre-emptive Priority Call (SS-PC) .14
4.3.27 Short Number Addressing (SS-SNA) .14
4.3.28 Transfer of Control (SS-TC).14
4.3.29 Talking Party Identification (SS-TPI) .14
4.4 Interaction with PSTN supplementary services .14
4.5 Intersystem interworking.14
4.6 PSTN gateway service description .15
4.6.1 General.15
4.6.2 PSTN gateway services offered over the PSTNCC-SAP.15

Page 4
ETS 300 392-4-1: January 1999
4.6.2.1 ALERT. 15
4.6.2.2 CALL PROCEEDING. 16
4.6.2.3 CONNECT . 16
4.6.2.4 CONNECT-ACKNOWLEDGE . 17
4.6.2.5 INFORM. 17
4.6.2.6 RELEASE. 17
4.6.2.7 SETUP . 18
4.6.2.8 TX-CEASED . 18
4.6.2.9 TX-DEMAND. 19
4.6.2.10 TX-GRANTED. 19
4.6.2.11 TX-INTERRUPT. 19
4.6.2.12 PSTNCC-SAP parameter description. 20
4.6.3 PSTN gateway services offered at the PSTN line interface . 21
4.6.3.1 PSTN line interface primitives. 21
4.6.3.2 PSTN CONNECT. 21
4.6.3.2A PSTN DIALLING . 21
4.6.3.3 PSTN DIALLING TONE. 22
4.6.3.3A PSTN DISCONNECT. 22
4.6.3.4 TETRA ALERT. 22
4.6.3.5 TETRA DIALLING. 22
4.6.3.6 TETRA DIALLING TONE. 22
4.6.3.7 TETRA DISCONNECT TONE . 22
4.6.3.8 TETRA INVALID NUMBER TONE. 23
4.6.3.9 TETRA TX-CEASED. 23
4.6.3.10 TETRA TX-CEASED TONE . 23
4.6.3.11 TETRA TX-DEMAND. 23
4.6.3.12 TETRA TX-GRANTED TONE. 23
4.6.3.13 TETRA TX-INTERRUPT TONE. 23
4.6.3.14 PSTN line interface parameter description . 24
4.6.4 Overall SDL . 24
5 PSTN gateway stage 2 specification . 30
5.1 Functional model. 30
5.1.1 Functional model description. 30
5.1.2 Description of functional entities. 30
5.1.2.1 PSTN gateway control entity, FE1 . 30
5.1.2.2 PSTN call control entity, FE2 . 30
5.1.3 Relationship of functional model to basic call functional model. 30
5.2 Information flow. 31
5.2.1 Definition of information flows. 31
5.2.1.1 Alert tone. 31
5.2.1.2 Busy tone . 31
5.2.1.3 Dialling . 31
5.2.1.4 Dialling tone . 31
5.2.1.5 Off-hook and on-hook . 31
5.2.1.6 PSTN ALERT. 31
5.2.1.7 PSTN disconnect tone . 32
5.2.1.8 Subscriber answer . 32
5.2.1.9 TETRA alert tone . 32
5.2.1.10 TETRA dialling tone . 32
5.2.1.11 TETRA disconnect tone. 32
5.2.1.12 TETRA invalid number tone. 32
5.2.1.13 TETRA queuing tone . 32
5.2.1.14 TETRA TX-DEMAND. 32
5.2.1.15 TX-ceased tone. 33
5.2.1.16 TX-granted tone . 33
5.2.1.17 TX-interrupt tone . 33
5.2.1.18 Unknown destination tone. 33
5.2.2 Information flow diagrams . 33
5.2.2.1 Successful call set-up to a PSTN subscriber using hook
signalling . 34
5.2.2.2 Successful call set-up to a PSTN subscriber using direct
call setup. 34

Page 5
ETS 300 392-4-1: January 1999
5.2.2.3 Successful call set-up from a PSTN subscriber over
PSTN gateway.35
5.2.2.4 Unsuccessful call set-up from TETRA user over PSTN
gateway.35
5.2.2.5 Unsuccessful call set-up from a PSTN subscriber over
PSTN gateway.36
5.2.2.6 Call maintenance procedures - Request to transmit from
the PSTN subscriber .36
5.2.2.7 Call maintenance procedures - Request to transmit from
a TETRA user.37
5.2.2.8 Call maintenance procedures - Request to interrupt.37
5.2.2.9 Call maintenance procedures - Request to disconnect
from the TETRA user .37
5.2.2.10 Call maintenance procedures - Request to disconnect
from the PSTN subscriber .38
5.2.2.11 Call maintenance procedures - Request to disconnect
from the PSTN gateway.38
5.3 Functional entity actions .38
5.3.1 Functional entity actions of FE1 .38
5.3.2 Functional entity actions of FE2 .39
5.4 Allocation of functional entities to physical equipment.40
5.5 Inter-working considerations.40
6 PSTN gateway stage 3 specification.40
6.1 Protocol structure and protocol stack .40
6.2 Protocol Data Unit (PDU) descriptions .40
6.2.1 Alert tone .41
6.2.2 Busy tone.41
6.2.3 Dialling.41
6.2.4 Dialling tone.41
6.2.5 Off-hook .41
6.2.6 On-hook.41
6.2.7 PSTN ALERT .41
6.2.8 PSTN disconnect tone.41
6.2.9 Subscriber answer.41
6.2.10 TETRA alert tone.41
6.2.11 TETRA busy tone .42
6.2.12 TETRA dialling tone .42
6.2.13 TETRA disconnect tone .42
6.2.14 TETRA invalid number tone .42
6.2.15 TETRA queuing tone.42
6.2.16 TX-DEMAND.42
6.2.17 TX-ceased tone.42
6.2.18 TX-granted tone .42
6.2.19 TX-interrupt tone .42
6.3 PSTN GATEWAY Functional Entity FE1 behaviour .42
6.3.1 PSTN gateway FE1 protocol states .43
6.3.2 Protocol timers for FE1 .43
6.3.3 Procedures of FE1 .43
6.3.4 Behaviour of FE1.43
6.4 PSTN and PSTN subscriber Functional Entity FE2 behaviour .48
6.4.1 State IDLE .48
6.4.2 State ACTIVE .48
Annex A (informative): Dialling for TETRA basic call.49
Annex B (informative): TETRA supplementary services.50
Annex C (informative): Call modifiers.51
Annex D (informative): Guidance tones .52
D.1 TETRA alert tone.52

Page 6
ETS 300 392-4-1: January 1999
D.2 TETRA busy tone . 52
D.3 TETRA called party not available . 52
D.4 TETRA congestion tone . 52
D.5 TETRA dialling tone. 52
D.6 TETRA disconnect tone. 52
D.7 TETRA invalid number tone . 52
D.8 TETRA queuing tone . 52
D.9 TX-ceased tone . 52
D.10 TX-granted tone. 53
D.11 TX-interrupt tone. 53
History. 54

Page 7
ETS 300 392-4-1: January 1999
Foreword
This European Telecommunication Standard (ETS) has been produced by the Terrestrial Trunked Radio
(TETRA) Project of the European Telecommunications Standards Institute (ETSI).
This ETS is a multi-part standard and will consist of the following parts:
Part 1: "General network design";
Part 2: "Air Interface (AI)";
Part 3: "Interworking at the Inter-System Interface (ISI)";
Part 4: "Gateways basic operation";
Part 5: "Peripheral Equipment Interface (PEI)";
Part 6: "Line connected Station (LS)";
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".
Transposition dates
Date of adoption of this ETS: 18 December 1998
Date of latest announcement of this ETS (doa): 31 March 1999
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 September 1999
Date of withdrawal of any conflicting National Standard (dow): 30 September 1999

Page 8
ETS 300 392-4-1: January 1999
Blank page
Page 9
ETS 300 392-4-1: January 1999
1 Scope
This European Telecommunication Standard (ETS) defines the Terrestrial Trunked Radio (TETRA)
system supporting Voice plus Data (V+D). It specifies the stage one to three of the TETRA gateway to
Public Switched Telephone Network (PSTN). Stage one is an overall service description from the user's
point of view, but does not deal with the details of the human interface itself.
The PSTN gateway establishes a basic call, when SwMI detects an outgoing call from a TETRA user to
PSTN or the PSTN gateway detects an incoming call from PSTN to a TETRA user. The PSTN gateway
ensures that basic signalling required in the operation of the TETRA call and the PSTN call is maintained
across the gateway.
Circuit mode data modem types and data modem data connection set-up negotiations required to set-up
circuit mode data modems used in the analogue path between the PSTN gateway and a PSTN subscriber
are outside the scope of this ETS.
Support of TETRA and PSTN supplementary services is outside the scope of this ETS.
The PSTN gateway and the TETRA system is seen by the external network as it were a subscriber of the
external network. For incoming calls from PSTN two step dialling is used. The dialling requires Dual Tone
Multi Frequency (DTMF) capability from the PSTN user provided either by normal telephone set or by a
DTMF device external to the telephone set. Other means of incoming call dialling and a direct
communication, using other than PSTN subscriber lines, between TETRA system and the external
network exchange are outside the scope of this ETS.
End to end encryption is outside the scope of this ETS.
Gateway specifications are presented in three stages. The stage 1 specification specifies the PSTN
gateway service as seen by the TETRA system and by the PSTN subscriber. The stage 2 specification
identifies the functional entities involved in the gateway service and the information flows between them.
The stage 3 describes the service protocol related to the services. The described network layer services
and protocols apply for the Switching and Management Infrastructure (SwMI) and for the PSTN gateway
and to the keypad protocol for the PSTN subscriber using TETRA services.
This ETS describes the PSTN gateway as an Additional Network Function, which provides a PSTN
interface to the SwMI. The service description is informative and does not imply any implementation.
2 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
[1] ETS 300 392-2: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 2: Air Interface (AI)".
[2] ETS 300 001: "Attachments to the Public Switched Telephone Network (PSTN);
General technical requirements for equipment connected to an analogue
subscriber interface in the PSTN".
[3] ITU-T Recommendation Z.100: "Specification and Description Language".
[4] ITU-T Recommendation I.530: "Integrated Services Digital Network (ISDN);
Internetwork interfaces; Network interworking between an ISDN and a Public
Switched Telephone Network (PSTN)".
[5] ITU-T Recommendation E.180: "Telephone network and ISDN operation,
numbering, routing and mobile service, Technical characteristics of tones for the
telephone service".
Page 10
ETS 300 392-4-1: January 1999
[6] ETS 300 738: "Human Factors (HF); Minimum Man-Machine Interface (MMI) to
public network based supplementary services".
[7] ETS 300 392-12-10: "Terrestrial Trunked Radio (TETRA); Voice plus Data
(V+D); Part 12: Supplementary services stage 3; Sub-part 10: Priority Call (PC)".
[8] ETS 300 392-1: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 1: General network design".
[9] ETS 300 392-12-16: "Terrestrial Trunked Radio (TETRA); Voice plus Data
(V+D); Part 12: Supplementary services stage 3; Sub-part 16: Pre-emptive
Priority Call (PPC)".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply in addition to definitions in ETS 300 392-2 [1]:
in-band tone: An audio tone indication to the user about state of the call progress. May be also an
announcement.
incoming call: A call from the PSTN to the TETRA network.
outgoing call: A call from a TETRA network to the PSTN.
PSTN: Any telecommunication network, which supports analogue PSTN subscriber signalling.
PSTN subscriber: An analogue PSTN user outside TETRA addressing domain and participates in a
PSTN gateway call.
TETRA user: A user within TETRA addressing domain and participates in a PSTN gateway call.
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
CC Call Control (functional entity)
CCA Call Control Agent (functional entity)
CMCE Circuit Mode Control Entity
DTMF Dual Tone Multi Frequency
FE Functional Entity
ISI Inter System Interface
PABX Private Automatic Branch Exchange (analogue network)
PDU Protocol Data Unit
PSTN Public Switched Telephone Network (analogue network)
PSTNCC-SAP Public Switched Telephone Network gateway Call Control Service Access Point
PSTND-SAP Public Switched Telephone Network gateway D Service Access Point
Service Code Command
SCC
Service Code Command Format
SCCF
SDL Specification and Description Language
SSI Short Subscriber Identity
SwMI Switching and Management Infrastructure
TETRA Terrestrial Trunked Radio

Page 11
ETS 300 392-4-1: January 1999
4 PSTN gateway stage 1 specification
4.1 Description
4.1.1 General description
The PSTN gateway enables calls to be set-up from a TETRA user to a PSTN subscriber and from
a PSTN subscriber to a TETRA user. Additionally, for the duration of the call, the PSTN gateway allows
TETRA signalling information to be passed from TETRA Switching and Management Infrastructure
(SwMI) to the external network user and from the external network user to the TETRA SwMI in
accordance with the TETRA Call Control (CC) procedures as defined in ETS 300 392-2 [1].
The principles defined in this ETS can be used for interfacing with other networks such as analogue
private networks (e.g. Private Automatic Branch Exchange (PABX)).
4.1.2 Qualifications on applicability to telecommunication services
The PSTN gateway shall be applicable to clear mode point-to-point and point-to-multipoint circuit mode
basic services as defined in ETS 300 392-2 [1]. End-to-end encryption could be supported between a
TETRA user and the PSTN gateway, but all provisions are outside the scope of this ETS.
Circuit mode data modem types and data modem data connection set-up negotiations required to
configure circuit mode data modems used in the analogue path between the PSTN gateway and a PSTN
subscriber are outside the scope of this ETS.
4.2 Procedures
4.2.1 Provision/withdrawal
The PSTN gateway service shall be provided by prior arrangement with the service provider or they may
be generally available.
This service may be withdrawn by the service provider at any time without a prior indication.
4.2.2 Normal procedures
4.2.2.1 Activation/deactivation/registration/interrogation
PSTN gateway shall be permanently activated upon provision.
Registration and interrogation are not applicable.
4.2.2.2 Invocation and operation
The PSTN gateway shall be invoked either when a call request has been received (outgoing call) by the
SwMI to a PSTN subscriber, or when a call request (incoming call) is received by the gateway from the
PSTN.
In the outgoing call case the PSTN gateway shall route the call to the PSTN network using the information
found in the TETRA address and/or in the external subscriber address element. The PSTN gateway shall
dial the external network number using appropriate dialling mechanisms defined for that network (see
ETS 300 001 [2] or relevant national requirement not covered by ETS 300 001 [2]).
In the incoming call case the PSTN gateway shall forward the called TETRA user identity to the SwMI CC
entity for the call set-up completion.
The PSTN gateway shall remain operational for the duration of the call, sending and receiving TETRA
signalling messages as appropriate under direction from the SwMI.
A PSTN gateway supporting full duplex calls shall ensure an appropriate echo cancellation for PSTN (see
ITU-T Recommendation I.530 [4]).

Page 12
ETS 300 392-4-1: January 1999
A PSTN gateway supporting semi-duplex calls may inform the PSTN subscriber about the state of the call
and may either receive explicit requests to transmit from the external network user, or use a voice
detection mechanism for the requests to transmit. The exact mechanisms for voice detection, and its
algorithms, and how the result is used for the request to transmit are outside the scope of this ETS.
4.2.3 Exceptional procedures
4.2.3.1 Activation/deactivation/registration/interrogation
Are not applicable.
4.2.3.2 Invocation and operation
The PSTN gateway may reject the call request with an appropriate failure indication for any of the
following reasons:
- no destination number provided;
- PSTN access line congestion;
- the called user does not answer;
- the called user is busy;
- the called user address is incorrect.
In addition, all restrictions and exceptional procedures for TETRA basic call establishment shall apply.
4.3 Interaction with TETRA supplementary services
Interactions with invocation and operation of supplementary services are specified below.
4.3.1 Ambience Listening (SS-AL)
There shall be no interaction. A PSTN subscriber cannot be ambience listened to.
4.3.2 Access Priority (SS-AP)
Shall not be applicable.
4.3.3 Area Selection (SS-AS)
There shall be no interaction. The SS-AS information exchange with the PSTN subscriber may be limited.
4.3.4 Barring of Incoming Calls (SS-BIC)
There shall be no interaction. The SS-BIC information exchange with the PSTN subscriber may be limited.
4.3.5 Barring of Outgoing Calls (SS-BOC)
There shall be no interaction. The SS-BOC information exchange with the PSTN subscriber may be
limited.
4.3.6 Call Authorised by Dispatcher (SS-CAD)
There shall be no interaction. The SS-CAD information exchange with the PSTN subscriber may be
limited.
4.3.7 Completion of Calls to Busy Subscriber (SS-CCBS)
There shall be no interaction. The SS-CCBS information exchange with the PSTN subscriber may be
limited.
Page 13
ETS 300 392-4-1: January 1999
4.3.8 Completion of Calls on No Reply (SS-CCNR)
There shall be no interaction. The SS-CCNR information exchange with the PSTN subscriber may be
limited.
4.3.9 Call Forwarding Busy (SS-CFB)
There shall be no interaction. The SS-CFB information exchange with the PSTN subscriber may be
limited.
4.3.10 Call Forwarding No Reply (SS-CFNRy)
There shall be no interaction. The SS-CFNRy information exchange with the PSTN subscriber may be
limited.
4.3.11 Call Forwarding Not Reachable (SS-CFNRc)
There shall be no interaction. SS-CFNRc cannot be activated against PSTN user or users as the PSTN
users shall be considered always reachable. The SS-CFNRc information exchange with the PSTN
subscriber may be limited.
4.3.12 Call Forwarding Unconditional (SS-CFU)
There shall be no interaction. The SS-CFU information exchange with the PSTN subscriber may be
limited.
4.3.13 Calling Line Identification Presentation (SS-CLIP)
There shall be no interaction. The SS-CLIP information exchange to the PSTN subscriber may be limited.
The calling PSTN subscriber number may not be available.
4.3.14 Calling/Connected Line Identification Restriction (SS-CLIR)
There shall be no interaction. The PSTN line presentation shall be independent of TETRA SS-CLIR.
4.3.15 Connected Line Identification Presentation (SS-COLP)
There shall be no interaction. The SS-COLP information exchange to the external user may be limited.
The connected PSTN subscriber number may not be available.
4.3.16 Call Report (SS-CR)
There shall be no interaction. The SS-CR information exchange with the PSTN subscriber may be limited.
4.3.17 Call Retention (SS-CRT)
There shall be no interaction. The SS-CRT information exchange with the PSTN subscriber may be
limited.
4.3.18 Call Waiting (SS-CW)
There shall be no interaction. The SS-CW information exchange with the PSTN subscriber may be limited.
4.3.19 Dynamic Group Number Assignment (SS-DGNA)
There shall be no interaction.
4.3.20 Discreet Listening (SS-DL)
There shall be no interaction. The listening invocation service may be provided to a PSTN subscriber with
special arrangements outside this ETS.

Page 14
ETS 300 392-4-1: January 1999
4.3.21 Call Hold (SS-HOLD)
There shall be no interaction. The SS-HOLD information exchange with the PSTN subscriber may be
limited.
4.3.22 Include Call (SS-IC)
There shall be no interaction. The SS-IC information exchange with the PSTN subscriber may be limited.
4.3.23 Late Entry (SS-LE)
Shall not be applicable.
4.3.24 List Search Call (SS-LSC)
There shall be no interaction. The SS-LSC information exchange with the PSTN subscriber may be
limited.
4.3.25 Priority Call (SS-PC)
There shall be no interaction. The SS-PC information exchange with the PSTN subscriber may be limited.
4.3.26 Pre-emptive Priority Call (SS-PC)
There shall be no interaction. The SS-PC information exchange with the PSTN subscriber may be limited.
4.3.27 Short Number Addressing (SS-SNA)
There shall be no interaction. The SS-SNA information exchange with the PSTN subscriber may be
limited.
4.3.28 Transfer of Control (SS-TC)
There shall be no interaction. The SS-TC information exchange with the PSTN subscriber may be limited.
4.3.29 Talking Party Identification (SS-TPI)
There shall be no interaction. The SS-TPI information exchange with the PSTN subscriber may be limited.
4.4 Interaction with PSTN supplementary services
There shall be no interaction between PSTN gateway and PSTN supplementary services.
4.5 Intersystem interworking
TETRA intersystem interworking shall not interact with the PSTN gateway functions. Outgoing calls to the
PSTN may be routed to another SwMI and incoming calls from the PSTN may be routed to another SwMI.

Page 15
ETS 300 392-4-1: January 1999
4.6 PSTN gateway service description
4.6.1 General
This subclause describes services offered by the PSTN gateway at the Circuit Mode Control Entity
(CMCE) CC Service Access Point (PSTNCC-SAP) of a TETRA V+D layer 3 service boundary inside a
SwMI and at the PSTN subscriber line interface point as presented in figure 1.
PSTNCC-SAP PSTN user
PSTN gateway and PSTN
Figure 1: Service description model
The information contained in the following primitive description tables corresponds to the following key:
- C/O/M: conditional/optional/mandatory.
4.6.2 PSTN gateway services offered over the PSTNCC-SAP
The primitives for the PSTN gateway services shall support a subset of the air interface services. The
external subscriber address in the air interface SETUP PDU shall be used as a PSTN address (see
ETS 300 392-2 [1]). The primitives refer to one instance of a PSTN gateway call by a call identifier
parameter.
NOTE: This SAP is defined for service description purposes and is not intended to present or
restrict any implementation.
In addition to these service primitives the TETRA user may receive various in-band tones (guidance and
supervisory tones) or announcements from the PSTN such as:
- alert tone;
- busy tone;
- PSTN disconnect tone.
See subclause 5.2.1 for more details.
4.6.2.1 ALERT
ALERT request primitive shall indicate to the PSTN gateway that the called TETRA user is being alerted.
ALERT indication primitive shall indicate that the called PSTN subscriber is being alerted. A PSTN
generated tone may replace the indication primitive in direct call set-up.

Page 16
ETS 300 392-4-1: January 1999
Table 1 lists the parameters within the ALERT primitive.
Table 1: Parameters for the ALERT primitive
Parameter Request Indication
Call identifier M M
Call time-out, set-up phase M M
Hook method selection M M
Simplex/duplex selection M M
Call queued O O
Basic service information O O
Facility O O
4.6.2.2 CALL PROCEEDING
CALL PROCEEDING indication primitive acknowledges that the PSTN call is processed.
Table 2 lists the parameters within the CALL PROCEEDING primitive.
Table 2: Parameters for the CALL PROCEEDING primitive
Parameter Indication
Call identifier M
Call time-out, set-up phase M
Hook method selection M
Simplex/duplex selection M
Basic service information O
Call status O
Notification indicator O
Facility O
4.6.2.3 CONNECT
CONNECT request primitive shall acknowledge that the called TETRA user is ready for through
connection.
CONNECT indication primitive shall acknowledge that the called PSTN subscriber is alerted or ready for
through connection.
Table 3 lists the parameter within the CONNECT primitive.
Table 3: Parameters for the CONNECT primitive
Parameter Request Indication
Call identifier M M
Call time-out M -
Hook method selection M M
Simplex/duplex selection M M
Transmission grant M -
Transmission request permission M -
Call priority O -
Basic service information O O
Call queued O -
Notification indicator O O
Facility O O
Page 17
ETS 300 392-4-1: January 1999
4.6.2.4 CONNECT-ACKNOWLEDGE
CONNECT-ACKNOWLEDGE request shall order the PSTN gateway to through connect to the called
PSTN subscriber.
Table 4 lists the parameters within the CONNECT-ACKNOWLEDGE primitive.
Table 4: Parameters for the CONNECT-ACKNOWLEDGE primitive
Parameter Request
Call identifier M
Call time-out M
Call queued M
Transmission grant M
Transmission request permission M
Notification indicator O
Facility O
4.6.2.5 INFORM
INFORM indication and request shall be used to convey call related information between the SwMI and
the PSTN or PSTN subscriber.
Table 5 lists the parameters within the INFORM primitive.
Table 5: Parameters for the INFORM primitive
Parameter Request Indication
Call identifier M M
Reset call time-out timer (T310) M -
Call time-out O -
Call time-out, set-up phase O -
Modify O O
Call status O -
Notification indicator O O
External subscriber number, DTMF O O
Facility O O
4.6.2.6 RELEASE
RELEASE request shall order the gateway to disconnect the PSTN call.
RELEASE indication shall indicate that the gateway has disconnected the PSTN call.
Table 6 lists the parameters within the RELEASE primitive.
Table 6: Parameters for the RELEASE primitive
Parameter Request Indication
Call identifier M M
Disconnect cause M M
Notification indicator O O
Facility O O
Page 18
ETS 300 392-4-1: January 1999
4.6.2.7 SETUP
SETUP request shall enable a TETRA call to be set-up through the PSTN gateway to the called PSTN
subscriber.
SETUP indication shall inform an incoming call from the calling PSTN subscriber.
Table 7 lists the parameters within the SETUP primitive.
Table 7: Parameters for the SETUP primitive
Service element Request Indication
Call identifier M -
Called user's destination number M M
Area selection - M
Call time-out M -
Hook method selection M M
Simplex/duplex selection M M
Basic service information M M
Transmission grant M -
Transmission request permission M -
Request to transmit - M
Call priority M M
Notification indicator O O
Calling party identification O O
Facility O O
4.6.2.8 TX-CEASED
TX-CEASED request shall indicate to the PSTN gateway that transmission from the talking party has
ceased.
TX-CEASED indication shall inform that the PSTN subscriber has ceased to transmit.
Table 8 lists the parameters within the TX-CEASED primitive.
Table 8: Parameters for the TX-CEASED primitive
Parameter Request Indication
Call identifier M M
Transmission request permission M -
Notification indicator O O
Facility O O
Page 19
ETS 300 392-4-1: January 1999
4.6.2.9 TX-DEMAND
TX-DEMAND indication shall indicate a demand for transmission from the PSTN subscriber.
Table 9 lists the parameters within the TX-DEMAND primitive.
Table 9: Parameters for the TX-DEMAND primitive
Parameter Indication
Call identifier M
TX demand priority O
Encryption control O
Speech service O
Facility O
4.6.2.10 TX-GRANTED
TX-GRANTED request shall indicate to whom the demand for permission to transmit is to be been
granted.
Table 10 lists the parameters within the TX-GRANTED primitive.
Table 10: Parameters for the TX-GRANTED primitive
Parameter Request
Call identifier M
Transmission grant M
Transmission request permission M
Encryption control M
Speech service M
Notif
...