ETSI EN 300 392-3-12 V1.4.0 (2026-03)

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)

REN/TCCE-03279

Prizemni snopovni radio (TETRA) - Govor in podatki (V+D) - 3. del: Medsebojno delovanje na medsistemskem vmesniku (ISI) - 12. poddel: Neodvisnost transportnih plasti dodatne omrežne funkcije: posamezni klic (ANF-ISIIC)

General Information

• Status: Not Published
• Technical Committee: TCCE 3 - TCCE Air Interface and Network Protocols
• Current Stage: 9 - Start of OAP
• Due Date: 25-Mar-2026
• Completion Date: 25-Mar-2026
• Ref Project: oSIST prEN 300 392-3-12 V1.4.0:2026 - 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)

Standards Content (Sample)

Draft ETSI EN 300 392-3-12 V1.4.0 (2026-03)

EUROPEAN STANDARD
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)

2 Draft ETSI EN 300 392-3-12 V1.4.0 (2026-03)
Reference
REN/TCCE-03279
Keywords
ANF, interworking, TETRA, V+D
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ETSI
3 Draft ETSI EN 300 392-3-12 V1.4.0 (2026-03)
Contents
Intellectual Property Rights . 8
Foreword . 8
Modal verbs terminology . 10
1 Scope . 11
2 References . 11
2.1 Normative references . 11
2.2 Informative references . 12
3 Definition of terms, symbols and abbreviations . 13
3.1 Terms . 13
3.2 Symbols . 14
3.3 Abbreviations . 14
4 ANF-ISIIC stage 1 specification . 15
4.1 Description . 15
4.1.1 General description . 15
4.1.2 Qualifications on applicability to telecommunication services . 16
4.2 Procedures . 16
4.2.1 Provision/withdrawal . 16
4.2.2 Normal procedures . 16
4.2.2.1 Activation/deactivation/registration/interrogation . 16
4.2.2.2 Invocation and operation . 16
4.2.2.2.1 General . 16
4.2.2.2.2 Call routeing . 16
4.2.2.2.3 Control of call time-out timers . 17
4.2.2.2.4 Transmission control . 17
4.2.2.2.5 Setup modification. 17
4.2.2.2.6 Call modification . 17
4.2.2.2.7 Call restoration after migration . 17
4.2.2.2.8 Call clearing . 18
4.2.2.2.9 Interaction between ANF-ISIICs . 18
4.2.2.2.10 Resource queuing and allocation policies . 18
4.2.3 Exceptional procedures . 19
4.2.3.1 Activation/deactivation/registration/interrogation . 19
4.2.3.2 Invocation and operation . 19
4.3 Interactions with other TETRA supplementary services and ANFs . 19
4.3.1 Introduction. 19
4.3.2 Calling Line Identification Presentation (SS-CLIP) . 19
4.3.3 Connected Line identification Presentation (SS-COLP) . 19
4.3.4 Calling/connected Line Identification Restriction (SS-CLIR) . 20
4.3.5 Call Report (SS-CR) . 20
4.3.6 Talking Party Identification (SS-TPI) . 20
4.3.7 Call Forwarding Unconditional (SS-CFU) . 20
4.3.8 Call Forwarding on Busy (SS-CFB) . 21
4.3.9 Call Forwarding on No Reply (SS-CFNRy) . 23
4.3.10 Call Forwarding on Not Reachable (SS-CFNRc) . 23
4.3.11 List Search Call (SS-LSC) . 23
4.3.12 Call Authorized by Dispatcher (SS-CAD) . 24
4.3.13 Short Number Addressing (SS-SNA) . 25
4.3.14 Area Selection (SS-AS) . 25
4.3.15 Access Priority (SS-AP) . 25
4.3.16 Priority Call (SS-PC) . 25
4.3.17 Call Waiting (SS-CW) . 25
4.3.18 Call Hold (SS-HOLD) . 25
4.3.19 Call Completion to Busy Subscriber (SS-CCBS) . 26
4.3.20 Late Entry (SS-LE) . 26
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4 Draft ETSI EN 300 392-3-12 V1.4.0 (2026-03)
4.3.21 Pre-emptive Priority Call (SS-PPC) . 26
4.3.22 Include Call (SS-IC) . 26
4.3.23 Barring of Outgoing Calls (SS-BOC) . 26
4.3.24 Barring of Incoming Calls (SS-BIC) . 26
4.3.25 Discreet Listening (SS-DL) . 27
4.3.26 Ambience Listening (SS-AL) . 27
4.3.27 Dynamic Group Number Assignment (SS-DGNA) . 27
4.3.28 Call Completion on No Reply (SS-CCNR) . 27
4.3.29 Call Retention (SS-CRT) . 28
4.3.30 Additional Network Feature - Inter System Interface Group Call (ANF-ISIGC) . 28
4.3.31 Additional Network Feature - Inter System Interface Short Data Service (ANF-ISISDS) . 28
4.3.32 Additional Network Feature - Inter System Interface Mobility Management (ANF-ISIMM) . 28
4.3.33 Additional Network Feature - Inter System Interface Supplementary service (ANF-ISISS) . 28
4.4 Interworking considerations . 28
5 ANF-ISIIC stage 2 specification . 29
5.1 Functional model . 29
5.1.1 Functional model description . 29
5.1.2 Description of functional entities . 34
5.1.2.1 Originating/Controlling SwMI individual call control application functional entity, FE1 . 34
5.1.2.2 Originating/Controlling SwMI ISI individual call originating functional entity, FE2 . 34
5.1.2.3 Called/Forward Switching SwMI call control functional entity, FE3 . 34
5.1.2.4 Called/Forward Switching SwMI ISI individual call functional entity, FE4 . 35
5.1.2.5 Terminating SwMI individual call control functional entity, FE5 . 36
5.1.2.6 ISI individual call terminating functional entity, FE6 . 36
5.1.2.7 New terminating SwMI call restoring functional entity, FE7 . 36
5.1.2.8 New terminating SwMI ISI call restoring functional entity (ANF-ISIIC), FE8 . 37
5.2 Information flow . 37
5.2.1 Examples of information flow sequences . 37
5.2.1.1 Introduction . 37
5.2.1.2 Successful call set-up when the called user is registered in SwMI B and uses on/off hook
signalling . 38
5.2.1.3 Successful call set up when the called user is registered in SwMI B and uses direct set-up
signalling . 38
5.2.1.4 ANF-ISIIC set-up to a called user having migrated from SwMI B, using forward switching . 40
5.2.1.5 ANF-ISIIC set-up to a called user having migrated from SwMI B, using re-routeing . 40
5.2.1.6 Loop avoidance in case of intra-TETRA call . 41
5.2.1.7 Unsuccessful ANF-ISIIC call set-up . 42
5.2.1.8 Transmission control . 43
5.2.1.9 Call modify . 46
5.2.1.10 Call restoration after migration . 46
5.2.1.11 Call clearing . 49
5.2.1.12 Resource queuing and allocation . 50
5.2.2 Definition of information flows . 51
5.2.2.1 General . 51
5.2.2.2 CALL RESTORE . 51
5.2.2.3 CALL RESTORE PREPARE . 52
5.2.2.4 CHARACTERISTIC CHANGE . 53
5.2.2.5 COMPLETE. 53
5.2.2.6 MIGRATION . 53
5.2.2.7 MODIFY . 54
5.2.2.8 RELEASE . 54
5.2.2.9 SETUP . 55
5.2.2.10 SETUP PROLONGATION . 56
5.2.2.11 TROMBONE . 56
5.2.2.12 TX-CEASED . 56
5.2.2.12.1 TX-CEASED 1 . 56
5.2.2.12.2 TX-CEASED 2 . 57
5.2.2.13 TX-CONTINUE 1 . 57
5.2.2.14 TX-CONTINUE 2 . 57
5.2.2.15 TX-DEMAND . 57
5.2.2.16 TX-GRANTED . 58
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5 Draft ETSI EN 300 392-3-12 V1.4.0 (2026-03)
5.2.2.17 TX-INTERRUPT . 58
5.2.2.18 TX-WAIT. 58
5.3 Functional entity actions . 59
5.4 Allocation of functional entities to physical equipment/SwMIs. 59
6 ANF-ISIIC stage 3 specification . 61
6.1 ANF-ISIIC coding requirements . 61
6.1.1 General . 61
6.1.2 TETRA PDUs . 61
6.1.2.1 General encoding rule . 61
6.1.2.2 ISI-SETUP PDU message sent by the originating or the forward switching SwMI . 61
6.1.2.3 ISI-PROGRESS PDU used to give information about the call progress . 63
6.1.2.4 ISI-REDIRECT PDU sent by the called SwMI when it is not the terminating SwMI because of
migration or SS-CF invocation . 63
6.1.2.5 ISI-FORWARD SWITCH PDU sent by the originating or the forward switching SwMI to
request forward switching . 65
6.1.2.6 ISI-ALERTING PDU sent by the terminating or the forward switching SwMI to give
information about the connected party alerted . 65
6.1.2.7 ISI-CONNECT PDU sent by the terminating or the forward switching SwMI to give information
that the connected party has answered the call . 65
6.1.2.8 ISI-CALL PROCEEDING sent by the terminating SwMI before the ISI-ALERTING or ISI-
CONNECT message . 67
6.1.2.9 ISI-SETUP PROLONGATION PDU sent to prolong the call setup time . 67
6.1.2.10 ISI CONNECT ACKNOWLEDGE PDU sent by the originating SwMI . 67
6.1.2.11 Transmission control PDUs sent by the controlling SwMI . 68
6.1.2.12 ISI-TX WAIT PDU possibly sent by either the controlling or the terminating SwMI. 69
6.1.2.13 ISI-INFO DEMAND and ISI-INFO REPLY PDU possibly sent by either the originating or the
terminating SwMI . 69
6.1.2.14 Transmission control PDUs sent by the terminating SwMI . 70
6.1.2.15 TETRA PDUs to restore the call after the calling or the connected user has migrated in a new
S wMI . 71
6.1.2.15.1 Case where no connection between the old SwMI and the new SwMI already exists or has
not been identified . 71
6.1.2.15.2 Cases where no new connection is needed between the old SwMI and the new SwMI . 73
6.1.2.16 ISI-DISCONNECT PDU sent by a SwMI in case of call clearing or call rejection . 75
6.1.2.17 TETRA PDUs specific for interaction with supplementary service protocol sent to the
originating SwMI . 75
6.1.2.18 ISI-QUEUING PDUs sent towards the terminating SwMI . 76
6.1.2.19 ISI-RESOURCE PDU sent towards the Terminating SwMI . 77
6.1.2.20 ISI-RESOURCE RESPONSE PDUs sent towards the Called or Originating SwMI after the call
has connected . 77
6.1.3 TETRA PDU information element coding . 77
6.1.3.1 Introduction . 77
6.1.3.2 Specific ISI definition of some information elements already defined for air interface messages . 78
6.1.3.2.1 Basic service information . 78
6.1.3.2.2 Call status . 78
6.1.3.2.3 Call time-out, set-up phase . 78
6.1.3.2.4 Disconnect cause information element . 79
6.1.3.2.5 PDU type . 80
6.1.3.3 New information elements used at the ISI . 80
6.1.3.3.1 Call diverted to a dispatcher . 80
6.1.3.3.2 Call has been forward switched . 81
6.1.3.3.3 Call identified as fleet call . 81
6.1.3.3.4 Called/forwarded-to external subscriber number. 81
6.1.3.3.5 Called/forwarded-to party extension . 81
6.1.3.3.6 Called/forwarded-to party SSI . 81
6.1.3.3.7 Called/forwarded-to party fleet number SSI . 81
6.1.3.3.8 Called/forwarded-to user having migrated . 81
6.1.3.3.9 Calling external subscriber number . 82
6.1.3.3.10 Calling external subscriber number parameters . 82
6.1.3.3.11 Calling party fleet number SSI . 82
6.1.3.3.12 Calling party presentation indicator. 82
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6 Draft ETSI EN 300 392-3-12 V1.4.0 (2026-03)
6.1.3.3.13 Cause for PDU addressed to originating SwMI . 82
6.1.3.3.14 Connected external subscriber number . 82
6.1.3.3.15 Connected external subscriber number parameters . 83
6.1.3.3.16 Connected party presentation indicator . 83
6.1.3.3.17 Connected party extension. 83
6.1.3.3.18 Connected party SSI . 83
6.1.3.3.19 Connected party fleet number SSI . 83
6.1.3.3.20 Controlling SwMI . 83
6.1.3.3.21 Incoming call barring status . 83
6.1.3.3.22 Forwarded-to external subscriber number . 84
6.1.3.3.23 Forwarded-to user extension . 84
6.1.3.3.24 Forwarded-to user SSI . 84
6.1.3.3.25 Last Forwarding SwMI MNI . 84
6.1.3.3.26 Modify accepted . 84
6.1.3.3.27 Modify request . 84
6.1.3.3.28 MSISDN present as external subscriber number . 84
6.1.3.3.29 New SwMI MNI . 84
6.1.3.3.30 Number of digits in called/forwarded-to external subscriber number . 85
6.1.3.3.31 Number of digits in calling external subscriber number . 85
6.1.3.3.32 Number of digits in connected external subscriber number . 85
6.1.3.3.33 Number of digits in forwarded-to external subscriber number . 85
6.1.3.3.34 Number of digits in visited/forwarded-to SwMI PISN number . 85
6.1.3.3.35 Originating SwMI MNI . 85
6.1.3.3.36 Other end SwMI MNI . 85
6.1.3.3.37 Override SS-CAD invocation . 86
6.1.3.3.38 PDU addressed to originating SwMI . 86
6.1.3.3.39 Possible ISI trombone or loop connection detected . 86
6.1.3.3.40 Restoring party extension . 86
6.1.3.3.41 Restoring party SSI . 86
6.1.3.3.42 Resource release permission . 86
6.1.3.3.43 Resource release signalling support. 87
6.1.3.3.44 Resource indicator . 87
6.1.3.3.45 Routeing method choice . 87
6.1.3.3.46 Routeing method response. 87
6.1.3.3.47 Security level at air interface . 88
6.1.3.3.48 Setup resource allocation . 88
6.1.3.3.49 Speech service requested/chosen/used . 88
6.1.3.3.50 Speech services supported . 88
6.1.3.3.51 SS-CF invocation counter . 88
6.1.3.3.52 SS-CF invoked . 89
6.1.3.3.53 SS-CLIR invoked for other party . 89
6.1.3.3.54 Terminating SwMI MNI . 89
6.1.3.3.55 Visited/forwarded-to SwMI MNI . 89
6.1.3.3.56 Visited/forwarded-to SwMI PISN number . 89
6.2 ANF-ISIIC state definitions . 89
6.3 ANF-ISIIC signalling procedures . 89
6.3.1 General . 89
6.3.2 Call establishment . 89
6.3.2.1 Call request and call proceeding . 89
6.3.2.2 Called user migration . 90
6.3.2.2.1 Introduction . 90
6.3.2.2.2 Called user having migrated in SwMI C different from SwMI A . 90
6.3.2.2.3 Called user having migrated in SwMI C coinciding with SwMI A . 92
6.3.2.3 Call characteristics and set-up time negotiation by the terminating SwMI . 93
6.3.2.4 Call through connection . 94
6.3.2.4.1 Call confirmation indication by the terminating SwMI . 94
6.3.2.4.2 Resource queuing and different resource allocation policies when no forward switching
SwMIs involved. 95
6.3.2.4.3 Resource queuing and different resource allocation policies if forward switching SwMIs are
involved . 96
6.3.2.5 Failure of call establishment . 98
6.3.3 Call maintenance procedures . 98
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7 Draft ETSI EN 300 392-3-12 V1.4.0 (2026-03)
6.3.3.1 Transmission control procedures . 98
6.3.3.2 Call modification . 99
6.3.3.3 Call restoration . 100
6.3.3.3.1 General call restoration procedure . 100
6.3.3.3.2 Specific call restoration procedure in a SwMI already on the path of the call . 101
6.3.4 DTMF procedures . 102
6.3.5 ANF-ISIIC clearing . 102
6.4 ANF-ISIIC impact of interworking with ISDN/PISN/PSTN . 103
6.5 Protocol interactions between ANF-ISIIC and supplementary services and other ANFs . 103
6.5.1 Interaction with SS-CLIR . 103
6.5.2 Interactions with SS-CF . 104
6.5.2.1 Interaction with SS-CF at call establishment . 104
6.5.2.2 Specific interaction with SS-CFNRy at call establishment . 105
6.5.2.3 Interaction with SS-CF at call restoration . 105
6.5.3 Interaction with SS-CAD . 105
6.5.3.1 Invocation of a specific ANF-ISIIC . 105
6.5.3.2 Interception of an already invoked ANF-ISIIC . 105
6.5.3.3 Call authorization by a distant dispatcher . 106
6.5.3.4 Completion of call establishment . 106
6.5.3.4.1 Call not diverted to dispatcher . 106
6.5.3.4.2 Call diverted to dispatcher . 106
6.5.4 Interactions with SS-PC, SS-PPC and SS-CRT . 107
6.5.5 Interaction with SS-CW . 107
6.5.6 Interaction with SS-HOLD . 107
6.5.7 Interaction with SS-CCBS and SS-CCNR . 107
6.5.8 Interaction with SS-BIC . 107
6.5.9 Area Selection (SS-AS) and selected area number . 108
6.5.10 Interactions with other supplementary services . 108
6.6 ANF-ISIIC parameter values (timers) . 108
Annex A (informative): Interactions of SS-CFU with ANF-ISIIC . 109
A.1 Possible SS-CFU activation . 109
A.2 Invocation and operation . 109
A.2.1 Invocation . 109
A.2.2 Called user home SwMI being SwMI A . 109
A.2.3 Called user home SwMI being SwMI B . 109
A.2.3.1 Introduction. 109
A.2.3.2 Forwarded-to user with home SwMI being SwMI B, being registered in its home SwMI . 110
A.2.3.3 Forwarded-to user with home SwMI being SwMI B, having migrated . 111
A.2.3.4 Forwarded-to user with home SwMI different from SwMI B, being registered in its home SwMI . 111
A.2.3.5 Forwarded-to user with home SwMI different from SwMI B, having migrated . 111
Annex B (informative): Change Requests . 114
History . 115

ETSI
8 Draft ETSI EN 300 392-3-12 V1.4.0 (2026-03)
Intellectual Property Rights
Essential pa
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