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Recommendation Q.1152
PROCEDURES FOR INTERWORKING BETWEEN INMARSAT AERONAUTICAL
MOBILE SATELLITE SYSTEM AND THE INTERNATIONAL
PUBLIC SWITCHED TELEPHONE NETWORK/ISDN
1 Introduction
This Recommendation provides the detailed procedures for interworking between the INMARSAT
aeronautical system and signalling systems of the public fixed network. For a brief
description of the INMARSAT aeronautical system, see Appendix I to Recommendation
Q.1151.
2 Conversion of information elements
Tables 1/Q.1152 and 2/Q.1152 list the signals of the INMARSAT aeronautical system that are
relevant for the purpose of interworking with the PSTN/ISDN. The forward interworking
telephone events (FITEs) and backward interworking telephone events (BITEs), as
defined in Annex A to Recommendations Q.601 to Q.608, that correspond to each of these
signals is also provided in the tables.
Tables 3/Q.1152 to 18/Q.1152 give the relationship between signals of the fixed network
signalling systems and the INMARSAT aeronautical system.
2.1w Signalling System R2w
2.1.1 Table 3/Q.1152 gives the relationship between messages in the INMARSAT aeronautical signalling
system and forward signals in Signalling System R2 for air-to-ground calls i.e.
interworking of INMARSAT aeronautical to Signalling System R2.
Table 4/Q.1152 shows the relationship between forward signals in Signalling System R2 and
messages in the INMARSAT aeronautical signalling system for ground-to-air calls. In
the comment column actions taken by the MSSC are indicated, in particular for signals
of R2 which have no equivalent message in the INMARSAT aeronautical system.
The signal numbers for forward signals of Signalling System R2 are those given in Table A-7 of
Annex A to Recommendations Q.601-Q.608.
2.1.2 Table 5/Q.1152 gives the relationship between messages in the INMARSAT aeronautical signalling
system and backward signals in Signalling System R2 for ground-to-air calls, i.e.
interworking of Signalling System R2 to INMARSAT aeronautical.
Backward signals in Signalling System R2 generated by the MSSC for unsuccessful ground-to-air
calls are given in Table 5w bisw/Q.1152. These signals are not related to any
specific message received from the aircraft earth station.
Table 6/Q.1152 gives the relationship between backward signals in Signalling System R2 and
messages in the INMARSAT aeronautical signalling system for air-to-ground calls, i.e.
interworking of INMARSAT aeronautical to Signalling System R2. The comments column
indicates specific actions taken by the MSSC.
The signal number of backward signals of Signalling System R2 are those given in Table A-11 of
Annex A to Recommendations Q.601-Q.608.
2.2w Signalling System No. 7 (TUP)w
2.2.1 Tables 7/Q.1152 and 8/Q.1152 are similar to Tables 3/Q.1152 and 4/Q.1152, respectively, and
apply to forward signals in Signalling System No. 7 (TUP).
The signal numbers for forward signals of Signalling System No. 7 (TUP) are those given in
Table A-5 wbisw of Annex A to Recommendations Q.601-Q.608.
2.2.2 Tables 9/Q.1152, 9 wbisw/Q.1152 and 10/Q.1152 are similar to Tables 5/Q.1152, 5 wbisw/Q.1152
and 6/Q.1152, respectively, and apply to backward signals in Signalling System No. 7
(TUP).
The signal numbers for backward signals in Signalling System No. 7 (TUP) are those given in
Table A-9 wbisw of Annex A to Recommendations Q.601-Q.608.
2.3w Signalling System No. 5w
2.3.1 Tables 11/Q.1152 and 12/Q.1152 are similar to Tables 3/Q.1152 and 4/Q.1152, respectively, and
apply to forward signals in Signalling System No. 5.
The signal numbers for forward signals of Signalling System No. 5 are those given in Table A-4
of Annex A to Recommendations Q.601-Q.608.
2.3.2 Tables 13/Q.1152, 13 wbisw/Q.1152 and 14/Q.1152 are similar to Tables 5/Q.1152, 5 wbisw/Q.1152
and 6/Q.1152, respectively, and apply to backward signals in Signalling System No. 5.
The signal numbers for backward signals in Signalling System No. 5 are those given in Table A-8
of Annex A to Recommendations Q.601-Q.608.
2.4 The relationship between forward and backward signals of Signalling System No. 7 (ISUP) and
messages of the INMARSAT aeronautical signalling system is for further study.
TABLE 1/Q.1152
INMARSAT aeronautical - forward signals
w
┌───────────────────────┬─────────────────────────────────────────────────────┐
│ FITE No. │ Message: info element: value │
├───────────────────────┼─────────────────────────────────────────────────────┤
│ wGround-to-air callsw │ │
│ │ │
│ 1 │ Call announcement: AES id: called terminal │
│ │ │
│ 17 │ Call announcement: service: telephone │
│ │ │
│ 22 │ Channel release │
├───────────────────────┼─────────────────────────────────────────────────────┤
│ wAir-to-ground callsw │ │
│ │ │
│ 17 │ Access request: message type: public/crew voice │
│ │ │
│ 18 │ Access request: message type: crew distress voice │
│ │ │
│ 1 │ Access request: address digits 0,1 │
│ │ │
│ 1 │ Service address: address digits 2 ... 17 │
│ │ │
│ 22 │ Channel release │
└───────────────────────┴─────────────────────────────────────────────────────┘
w
wNotew - Signals required for interworking with Signalling System No. 7 (ISUP) are
for further study.
TABLE 2/Q.1152
INMARSAT aeronautical - backward signals
w
┌───────────────────────┬─────────────────────────────────────────────────────┐
│ BITE No. │ Message: info element: value │
├───────────────────────┼─────────────────────────────────────────────────────┤
│ wGround-to-air callsw │ │
│ │ │
│ 5 │ Test │
│ 22 │ Connect │
│ 29 │ Channel release │
│ 16 │ Call attempt result: Cause: User busy │
│ 12 │ Call attempt result: Cause: No channel available │
│ 17 │ Call attempt result: Cause: Destination out of │
│ │ service │
├───────────────────────┼─────────────────────────────────────────────────────┤
│ wAir-to-ground callsw │ │
│ │ │
│ 22 │ Connect │
│ 2 │ Call attempt result: Address complete │
│ 29 │ Channel release │
│ 20 │ Call attempt result: Cause: Unspecified │
│ 16 │ Call attempt result: Cause: User busy │
│ 15 │ Call attempt result: Cause: Unassigned number │
│ 17 │ Call attempt result: Cause: Destination out of │
│ │ service │
│ 12 │ Call attempt result: Cause: No channel available │
│ 14 │ Call attempt result: Cause: Invalid number format │
└───────────────────────┴─────────────────────────────────────────────────────┘
w
wNotew - Signals required for interworking with Signalling System No. 7 (ISUP) are
for further study.
TABLE 3/Q.1152
Conversion of forward signals in the INMARSAT aeronautical
signalling system to Signalling System R2
Air-to-ground calls
w
┌─────────────────────────────────────────┬──────────────────────────────────────────┬────────┐
│ INMARSAT aeronautical signalling │ Signalling System R2 │ Signal │
│ system │ │ │
│ Message: info element: value │ Signal name: info element │ No. │
├─────────────────────────────────────────┼──────────────────────────────────────────┼────────┤
│ Access request: message type │ Calling party's category │ │
│ │ │ │
│ - public voice │ - subscriber/operator without forward │ 12 │
│ │ transfer facility │ │
│ - crew voice │ - subscriber/operator without forward │ 12 │
│ │ transfer facility │ │
│ - crew distress voice │ - subscriber/with priority │ 14 │
│ │ │ │
│ Access requests: address digits 0, 1 │ Country code indicator │ 10 │
│ │ (echo suppressor controls) │ │
│ │ │ │
│ Service address: digits 2 to 17 │ Address signals/first digit │ 1 │
│ │ │ │
│ Test: response │ Not applicable │ │
│ │ │ │
│ Channel release │ Clear forward │ 16 │
└─────────────────────────────────────────┴──────────────────────────────────────────┴────────┘
w
wNotew - Signal No. 21, nature of circuit indicator; one satellite circuit
in the connection - is generated by the GES, if required.
TABLE 4/Q.1152
Conversion of forward signals in Signalling System R2
to INMARSAT aeronautical signalling system
Ground-to-air calls
w
┌────────────────────────────────────────────┬──────────────────────────────────────────┬─────────────────────────┐
│ Signalling System R2 │ INMARSAT aeronautical signalling system │ │
│Signal No. Signal name │ Message: info element: value │ Comments │
├───────┬────────────────────────────────────┼──────────────────────────────────────────┼─────────────────────────┤
│ 1│ Address signals │ Call announcement: AES identity, called│ │
│ │ │ terminal │ │
│ │ │ │ │
│ 2-6│ Language digit: I-1 ...5 │ │ Interpreted by MSSC │
│ │ │ │ │
│ 7 │ Discriminating digit │ │ Interpreted by MSSC │
│ │ │ │ │
│ 8 │ Country code indicator │ │ MSSC will insert echo │
│ │ outgoing half suppressor required │ │ control device if needed│
│ │ │ │ │
│ 9 │ Country code indicator │ │ Interpreted by MSSC │
│ │ no echo suppressor required │ │ │
│ │ │ │ │
│10, 11 │ Country code indicator │ │ Interpreted by MSSC │
│ │ incoming half echo suppressor │ │ │
│ │ required │ │ │
│ │ │ │ │
│ 12 │ Calling party's category, │ Call announcement │ │
│ │ subscriber or operator │ - service: telephone │ │
│ │ without forward transfer │ │ │
│ │ facility │ │ │
│ │ │ │ │
│ 13 │ Calling party's category, │ │ Not applicable │
│ │ data transmission control │ │ │
│ │ │ │ │
│ 14 │ Calling party's category, │ Call announcement │ │
│ │ subscriber with priority │ - service: telephone, priority for │ │
│ │ │ further study │ │
│ │ │ │ │
│ 15 │ Calling party's category, │ Call announcement │ │
│ │ operator with forward │ - service: telephone │ │
│ │ transfer capability │ │ │
│ │ │ │ │
│ 16 │ Clear forward │ Channel release │ │
│ │ │ │ │
│ 17 │ Forward transfer │ │ Not applicable │
│ │ │ │ │
│ 18 │ First digit; I-1, I-2 ... I-10 │ │ Interpreted by MSSC │
│ │ │ │ │
│ 19 │ Reply to A-14; I-1 ... I-10 │ │ Not applicable │
│ │ │ │ │
│ 20 │ Reply to first A-13; I-13 │ │ Not applicable │
│ │ │ │ │
│ 21 │ Reply to first A-13; I-14 │ │ Not applicable │
└───────┴────────────────────────────────────┴──────────────────────────────────────────┴─────────────────────────┘
w
TABLE 5/Q.1152
Conversion of backward signals in the INMARSAT aeronautical signalling system
to Signalling System R2
Ground-to-air calls
w
┌──────────────────────────────────────────────┬───────────────────────────────────────────────────┬─────────────┐
│ INMARSAT aeronautical signalling system │ Signalling System R2 │ │
│ Message: info element: value │ Signal name: info element │ Signal No. │
├──────────────────────────────────────────────┼───────────────────────────────────────────────────┼─────────────┤
│ Test: response │ International, subscriber line free, charge │ 13 │
│ │ │ │
│ Connect │ Answer signal │ 11 │
│ │ │ │
│ Channel release │ Clear back │ 12 │
│ │ │ │
│ Call attempt result: Cause value: │ │ │
│ - user busy │ Subscriber line busy │ 5 │
│ - no channel available │ Congestion on the national network │ 1 │
│ - destination out of service │ Susbscriber line out of order │ 10 │
│ - others │ International; send special info tone │ 14 │
└──────────────────────────────────────────────┴───────────────────────────────────────────────────┴─────────────┘
w
TABLE 5 wbisw/Q.1152
Unsuccessful call events and backward signals in Signalling System R2
Ground-to-air calls
w
┌──────────────────────────────────────────────┬────────────────────────────────────────────┬────────────┐
│ INMARSAT aeronautical signalling system │ Signalling System R2 │ │
│ Event in INMARSAT system │ Signal name: info element │ Signal No. │
├──────────────────────────────────────────────┼────────────────────────────────────────────┼────────────┤
│ Congestion in MSSC │ B4 - Congestion │ 6 │
│ │ │ │
│ Incomplete AES number │ B5 - Unallocated number │ 7 │
│ │ │ │
│ Unallocated AES number │ B5 - Unallocated number │ 7 │
│ │ │ │
│ Continuity test failure │ B8 - Subscriber line out of order │ 10 │
│ │ │ │
│ AES barred for incoming access │ B2 - Send special info tone │ 4 │
│ │ │ │
│ AES absent │ B2 - Send special info tone │ 4 │
│ │ │ │
│ No satellite channel available │ B4 - Congestion │ 6 │
└──────────────────────────────────────────────┴────────────────────────────────────────────┴────────────┘
w
TABLE 6/Q.1152
Conversion of backward signals in Signalling System R2
to INMARSAT Aeronautical Signalling System
Air-to-ground calls
w
┌───────────────────────────────────────────┬──────────────────────────────────────────────────────┬─────────────────────┐
│ Signalling System R2 │ INMARSAT aeronautical signalling system │ │
│ │ │ Comments │
│ Signal No. Signal name │ Message: info element: value │ │
├───┬───────────────────────────────────────┼──────────────────────────────────────────────────────┼─────────────────────┤
│ 1 │ A4 - Congestion on the national │ Call attempt result: remote public network, │ │
│ │ network │ switching equipment congestion │ │
│ │ │ │ │
│ 2 │ A6 - Address complete, charge, set up│ " : address complete │ │
│ │ speech condition │ │ │
│ │ │ │ │
│ 3 │ A15 - Congestion in an international │ " : international network, │ │
│ │ exchange or at its output │ switching equipment │ │
│ │ │ │ │
│ 4 │ B2 - Send special information tone │ " : remote public network, │ │
│ │ │ unspecified │ │
│ │ │ │ │
│ 5 │ B3 - Subscriber line busy │ " : remote public network, │ │
│ │ │ user busy │ │
│ │ │ │ │
│ 6 │ B4 - Congestion │ " : remote public network, │ │
│ │ │ switching equipment congestion │ │
│ │ │ │ │
│ 7 │ B5 - Unallocated number │ " : remote public network, │ │
│ │ │ unassigned number │ │
│ │ │ │ │
│ 8 │ B6 - Subscriber line free, charge │ " : address complete │ │
│ │ │ │ │
│ │ │ │ │
│ 9 │ B7 - Subscriber line free, no charge │ " : address complete │No charge │
│ │ │ │information, used │
│ │ │ │by MSSC only │
│ │ │ │ │
│10 │ B8 - Subscriber line out of order │ " : remote public network, │ │
│ │ │ destination out of service │ │
│ │ │ │ │
│11 │ Answer │ Connect │ │
│ │ │ │ │
│ │ │ │ │
│12 │ Clear back │ Channel release │Clearback supervision│
│ │ │ │done by MSSC │
│ │ │ │ │
│13 │ B1-B6 - International, subscriber line│ Call attempt result: address complete │ │
│ │ free, charge │ │ │
│ │ │ │ │
│14 │ B9, B10 - International, send special │ " : international network, │ │
│ │ information tone │ unspecified │ │
│ │ │ │ │
│15 │ B11-B15 - Congestion │ " : remote public network, │ │
│ │ │ switching equipment congestion │ │
└───┴───────────────────────────────────────┴──────────────────────────────────────────────────────┴─────────────────────┘
w
TABLE 7/Q.1152
Conversion of forward signals in INMARSAT aeronautical signalling system
to Signalling System No. 7
Air-to-ground calls
w
┌──────────────────────────────────────────┬─────────────────────────────────────────────────┬───────────────────┐
│ INMARSAT aeronautical signalling system │ Signalling System No. 7 │ │
│ │ │ Signal No. │
│ Message: information element: values │ Signal name: Information element │ │
├──────────────────────────────────────────┼─────────────────────────────────────────────────┼───────────────────┤
│ Access request: Message type: │ Calling party's category indicator: │ 13 │
│ Public voice/ │ Ordinary subscriber/ │ 13 │
│ Crew voice/ │ Ordinary subscriber/ │ 13 │
│ Crew distress voice │ Subscriber with priority │ 14 │
│ │ │ │
│ │ │ │
│ Access request: Address │ Address signals: Digit 1, 2 ... 0 │ 1 │
│ digits 0, 1 │ nature of address indicator, international │ 3 │
│ Service address: Digit 2 to 17 │ number │ │
│ │ │ │
│ │ │ │
│ Test: Response │ Continuity check performed on previous │ 22 │
│ │ circuit │ │
│ │ │ │
│ │ │ │
│ Channel release │ Clear forward signal │ 16 │
└──────────────────────────────────────────┴─────────────────────────────────────────────────┴───────────────────┘
w
wNote w- Signal No. 5, nature of circuit indicator, one satellite in connection, is generated
by the MSSC.
TABLE 8/Q.1152
Conversion of forward signals in Signalling System No. 7 TUP
to INMARSAT aeronautical signalling system
Ground-to-air calls
w
┌─────────────────────────────────────────────┬────────────────────────────────────────────┬──────────────────────┐
│ Signalling System No. 7 │ INMARSAT aeronautical signalling system │ │
│ │ │ Comments │
│ Signal No. Signal name │ Message: info element: value │ │
├─────┬───────────────────────────────────────┼────────────────────────────────────────────┼──────────────────────┤
│ 1 │ Address signals │ Call announcement: AES ID, called terminal │ │
│ │ │ │ │
│ 2 │ Nature of address indicator, national│ - │ Interpreted by MSSC │
│ │ significant number │ │ │
│ │ │ │ │
│ 3 │ Nature of address indicator, │ - │ Interpreted by MSSC │
│ │ international number │ │ │
│ │ │ │ │
│ 4 │ Nature of circuit indicator, │ - │ Ignored by MSSC │
│ │ no satellite in connection │ │ │
│ │ │ │ │
│ 5 │ Nature of circuit indicator, │ - │ Ignored by MSSC │
│ │ one satellite in connection │ │ │
│ │ │ │ │
│ 6 │ Echo suppressor indicator, outgoing │ - │ MSSC will insert │
│ │ half-echo suppressor not included │ │ echo control device │
│ │ │ │ if needed │
│ │ │ │ │
│ 7 │ Echo suppressor indicator, outgoing │ - │ Interpreted by MSSC │
│ │ half-echo suppressor included │ │ │
│ │ │ │ │
│8-12 │ Calling party's category indicator, │ Call announcement: │ - │
│ │ language digit │ - service: telephone │ │
└─────┴───────────────────────────────────────┴────────────────────────────────────────────┴──────────────────────┘
w
TABLE 8/Q.1152 w(Cont.)w
Conversion of forward signals in Signalling System No. 7 TUP to
INMARSAT aeronautical signalling system
Ground-to-air calls
w
┌─────────────────────────────────────────────┬────────────────────────────────────────────┬──────────────────────┐
│ Signalling System No. 7 │ INMARSAT aeronautical signalling system │ │
│ │ │ Comments │
│ Signal No. Signal name │ Message: info element: value │ │
├─────┬───────────────────────────────────────┼────────────────────────────────────────────┼──────────────────────┤
│ │ │ │ │
│ 13 │ Calling party's category indicator, │ Call anouncement: │ - │
│ │ ordinary calling subscriber │ - service: telephone │ │
│ 14 │ Calling party's category indicator, │ Call announcement │ - │
│ │ calling subscriber with priority │ - service: telephone, priority for │ │
│ │ │ further study │ │
│ │ │ │ │
│ 15 │ Calling party's category indicator, │ - │ Not applicable │
│ │ data call │ │ │
│ │ │ │ │
│ 16 │ Clear forward │ Channel release │ - │
│ │ │ │ │
│ 17 │ Forward transfer │ - │ Not applicable │
│ │ │ │ │
│ 18 │ Continuity proved │ - │ Interpreted by MSSC │
│ │ │ │ │
│ 19 │ Continuity check failure │ Channel release │ - │
│ │ │ │ │
│ 20 │ Continuity check required │ - │ Interpreted by MSSC │
│ │ on this circuit │ │ │
│ │ │ │ │
│ 21 │ Continuity check not required │ - │ Interpreted by MSSC │
│ │ on this circuit │ │ │
│ │ │ │ │
│ 22 │ Continuity check performed on │ - │ Interpreted by MSSC │
│ │ previous circuit │ │ │
│ │ │ │ │
│ 23 │ Service information │ - │ Interpreted by MSSC │
│ │ │ │ │
│ 24 │ General set-up message │ - │ Interpreted by MSSC │
└─────┴───────────────────────────────────────┴────────────────────────────────────────────┴──────────────────────┘
w
TABLE 9/Q.1152
Conversion of backward signals in INMARSAT aeronautical signalling system to
Signalling System No. 7 TUP
Ground-to-air calls
w
┌─────────────────────────────────────┬───────────────────────────────────────────────────┐
│ INMARSAT aeronautical signalling │ Signalling System No. 7 │
│ system │ │
│ Message: information element: value │ Signal name Signal No.│
├─────────────────────────────────────┼────────────────────────────────────────┬──────────┤
│ Test: Response │ AFC: Address complete, subscriber free,│ 4 │
│ │ charge │ │
│ │ │ │
│ Connect │ ANC: Answer, charge │ 16 │
│ │ │ │
│ Channel release │ CLB: Clear back │ 19 │
│ │ │ │
│ Call attempt result: Cause value: │ │ │
│ - User busy │ SGB: Subscriber busy │ 12 │
│ - No channel available │ CGC: Circuit group congestion │ 8 │
│ - Destination out of service │ LOS: Line out of service │ 13 │
│ - Others │ SST: Send special information tone │ 14 │
└─────────────────────────────────────┴────────────────────────────────────────┴──────────┘
w
TABLE 9 wbisw/Q.1152
Unsuccessful events and backward signals in Signalling System No. 7
Ground-to-air calls
w
┌──────────────────────────────────┬──────────────────────────────────────────────────────┐
│ INMARSAT aeronautical signalling │ Signalling System No. 7 │
│ system │ │
│ Event in INMARSAT system │ Signal name Signal No.│
├──────────────────────────────────┼─────────────────────────────────────────┬────────────┤
│ │ │ │
│ Congestion in MSSC │ SEC: Switching equipment congestion │ 7 │
│ │ │ │
│ No satellite channel available │ NNC: National network congestion │ 9 │
│ │ │ │
│ Incomplete AES number │ ADI: Address incomplete │ 10 │
│ │ │ │
│ Unallocated AES number │ UNN: Unallocated number │ 11 │
│ │ │ │
│ Continuity test failure │ LOS: Line out of service │ 13 │
│ │ │ │
│ AES barred for incoming access │ SST: Send special information tone │ 14 │
│ │ │ │
│ AES absent │ SST: Send special information tone │ 14 │
└──────────────────────────────────┴─────────────────────────────────────────┴────────────┘
w
TABLE 10/Q.1152
Conversion of backward signals in Signalling System No. 7 TUP
to INMARSAT aeronautical signalling system
Air-to-ground calls
w
┌──────────────────────────────────────────────┬──────────────────────────────────────────┬───────────────────┐
│ Signalling System No. 7 │ INMARSAT aeronautical signalling system │ │
│ │ │ Comments │
│ Signal No. Signal name │ Message: info element: value │ │
├──────┬───────────────────────────────────────┼──────────────────────────────────────────┼───────────────────┤
│ 1 │ ADC: Address complete, charge │ Call attempt result: address complete │ - │
│ │ │ │ │
│ 2 │ ADN: Address complete, no charge │ Call result: address complete │ No-charge │
│ │ │ │ information used│
│ │ │ │ by MSSC only │
│ │ │ │ │
│ 3 │ ADX: Address complete, coinbox │ Call result: address complete │ - │
│ │ │ │ │
│ 4 │ AFC: Address complete, subscriber │ Call result: address complete │ - │
│ │ free charge │ │ │
│ │ │ │ │
│ 5 │ AFN: Address complete, subscriber │ Call result: address complete │ No-charge │
│ │ free no charge │ │ information used│
│ │ │ │ by MSSC only │
│ │ │ │ │
│ 6 │ AFX: Address complete, subscriber │ Call result: address complete │ - │
│ │ free, coinbox │ │ │
│ │ │ │ │
│ 7 │ SEC: Switching equipment congestion │ Call result: international network, │ - │
│ │ │ switching equipment │ │
│ │ │ congestion │ │
│ │ │ │ │
│ 8 │ CGC: Circuit-group congestion │ Call result: international network, │ - │
│ │ │ no channel available │ │
│ │ │ │ │
└──────┴───────────────────────────────────────┴──────────────────────────────────────────┴───────────────────┘
w
TABLE 10/Q.1152 w(Cont.)w
Conversion of backward signals in Signalling System No. 7 TUP
to INMARSAT aeronautical signalling system
Air-to-ground calls
w
┌──────────────────────────────────────────────┬───────────────────────────────────────────┬───────────────────┐
│ Signalling System No. 7 │ INMARSAT aeronautical signalling system │ │
│ Signal No. Signal name │ Message: info element: value │ Comments │
├──────┬───────────────────────────────────────┼───────────────────────────────────────────┼───────────────────┤
│ 9 │ NNC: National network congestion │ Call result: remote public network, │ - │
│ │ │ switching equipment │ │
│ │ │ congestion │ │
│ 10 │ ADI: Address complete │ Call result: remote public network, │ - │
│ │ │ invalid number format │ │
│ │ │ │ │
│ 11 │ UNN: Unallocated number │ Call result: remote public network, │ - │
│ │ │ unassigned number │ │
│ │ │ │ │
│ 12 │ SGB: Subscriber busy │ Call result: remote public network, │ - │
│ │ │ user busy │ │
│ │ │ │ │
│ 13 │ LOS: Line out of service │ Call result: remote public network, │ - │
│ │ │ destination out of service │ │
│ │ │ │ │
│ 14 │ SST: Send special information tone │ Call result: international network, │ - │
│ │ │ unspecified │ │
│ │ │ │ │
│ 15 │ CFL: Call failure │ Call result: international network, │ - │
│ │ │ unspecified │ │
│ │ │ │ │
│ 16 │ ANC: Answer, charge │ Connect │ - │
│ │ │ │ │
│ 17 │ ANN: Answer, no charge │ Connect │ No charge informa-│
│ │ │ │ tion used by MSSC │
│ │ │ │ │
│ 18 │ RAN: Reanswer │ Connect │ - │
│ │ │ │ │
│ 19 │ CLB: Clearback │ Channel release │ Clearback │
│ │ │ │ supervision done │
│ │ │ │ by MSSC │
│ │ │ │ │
│ 20 │ GRQ: General request message │ - │ Interpreted by │
│ │ │ │ MSSC │
│ │ │ │ │
│ 21 │ Call unsuccessful, access barred │ Call attempt result: remote public │ - │
│ │ │ network, unspecified│ │
│ │ │ │ │
│ 22 │ DPN: Call unsuccesful, digital path │ - │ Not applicable │
│ │ not provided │ │ │
└──────┴───────────────────────────────────────┴───────────────────────────────────────────┴───────────────────┘
w
TABLE 11/Q.1152
Conversion of forward signals in INMARSAT aeronautical signalling system
to Signalling System No. 5
Air-to-ground calls
w
┌─────────────────────────────────────────┬───────────────────────────────────────────────┐
│ INMARSAT aeronautical signalling system │ Signalling System No. 5 │
│ │ │
│ Message: info element: value │ Signal name Signal No. │
├─────────────────────────────────────────┼────────────────────────────────┬──────────────┤
│ Access request: message type: │ Discriminating digit 0 │ 7 │
│ - public voice │ Discriminating digit 0 │ 7 │
│ - crew voice │ Discriminating digit 0 │ 7 │
│ - crew distress voice │ │ │
│ │ │ │
│ Access request: address digits 0, 1 │ Address digits │ 1 │
│ Service address: digit 2 to 17 │ │ │
│ │ │ │
│ Test: response │ Not applicable │ │
│ │ │ │
│ Channel release │ Clear forward │ 10 │
└─────────────────────────────────────────┴────────────────────────────────┴──────────────┘
w
TABLE 12/Q.1152
Conversion of forward signals in INMARSAT aeronautical signalling system
to Signalling System No. 5
Air-to-ground calls
w
┌─────────────────────────────────────────────┬────────────────────────────────────────┬─────────────────────────┐
│ Signalling System No. 5 │ INMARSAT aeronautical signalling system│ │
│ │ │ Comments │
│ Signal No. Signal name │ Message: info element: value │ │
├───────────┬─────────────────────────────────┼────────────────────────────────────────┼─────────────────────────┤
│ 1 │ Address signals │ Call announcement: AES identity, │ │
│ │ │ called terminal │ │
│ │ │ │ │
│ 2-6 │ Language digit: 1 ...5 │ │ Interpreted by MSSC │
│ │ │ │ │
│ 7 │ Discriminating digit 0 │ Call announcement: │ │
│ │ │ - service: telephone │ │
│ 8 │ Start of pulsing signal KP1 │ - │ Interpreted by MSSC │
│ │ │ │ │
│ 9 │ Start of pulsing signal KP2 │ - │ Interpreted by MSSC │
│ │ │ │ │
│ 10 │ Clear forward │ Channel release │ │
│ │ │ │ Not applicable │
│ 11 │ Forward transfer │ - │ │
│ │ │ │ │
└───────────┴─────────────────────────────────┴────────────────────────────────────────┴─────────────────────────┘
w
TABLE 13/Q.1152
Conversion of backward signals in INMARSAT aeronautical signalling system to
Signalling System No. 5
Ground-to-air calls
w
┌───────────────────────────────────┬────────────────────────────────────────────────────┐
│ INMARSAT aeronautical signalling │ Signalling System No. 5 │
│ system │ │
│ Message: info element: value │ Signal name Signal No.│
├───────────────────────────────────┼─────────────────────────────────────────┬──────────┤
│ Test: response │Inform that ST has been sent │ 5 │
│ │ │ │
│ Connect │Answer signal │ 2 │
│ │ │ │
│ Channel release │Clear back │ 3 │
│ │ │ │
│ Call attempt result: cause value │Busy flash signal │ 1 │
│ - user busy │Busy flash signal │ 1 │
│ - no channel available │Information tone (Note) │ - │
│ - destination out of service │Information tone (Note) │ - │
│ - others │ │ │
└───────────────────────────────────┴─────────────────────────────────────────┴──────────┘
w
wNotew - May include appropriate recorded announcement.
TABLE 13 wbisw/Q.1152
Unsuccessful call events and backward signals in Signalling System No. 5
Ground-to-air calls
w
┌───────────────────────────────────┬─────────────────────────────────────────────────────┐
│INMARSAT aeronautical signalling │ Signalling System No. 5 │
│system │ │
│Event in INMARSAT system │ Signal name Signal No. │
├───────────────────────────────────┼───────────────────────────────────────┬─────────────┤
│ Congestion in MSSC │ Busy flash │ 1 │
│ │ │ │
│ No satellite channel available │ Busy flash │ 1 │
│ │ │ │
│ Incomplete AES number │ Information tone (Note) │ │
│ │ │ │
│ Unallocated AES number │ Information tone (Note) │ │
│ │ │ │
│ Continuity test failure │ Information tone (Note) │ │
│ │ │ │
│ AES absent │ Information tone (Note) │ │
│ │ │ │
│ AES barred for incoming access │ Information tone (Note) │ │
└───────────────────────────────────┴───────────────────────────────────────┴─────────────┘
w
wNotew - May include appropriate recorded announcement.
TABLE 14/Q.1152
Conversion of backward signals in Signalling System No. 5
to INMARSAT aeronautical signalling system
Air-to-ground calls
w
┌──────────────────────────────────────────────┬──────────────────────────────────────────┬───────────────────┐
│ Signalling System No. 5 │ INMARSAT aeronautical signalling system │ │
│ Signal No. Signal name │ Message: info element: value │ Comments │
├──────┬───────────────────────────────────────┼──────────────────────────────────────────┼───────────────────┤
│ 1 │ Busy - flash │ Call attempt result: international │ │
│ │ │ network, unspecified │ │
│ │ │ │ │
│ 2 │ Answer │ Connect │ │
│ │ │ │ │
│ 3 │ Clear back │ Channel release │ │
│ │ │ │ │
│ 4 │ Proceed to send │ - │Interpreted by MSSC│
│ │ │ │ │
│ 5 │ Inform that ST has been sent │ Call attempt result: address complete │ │
└──────┴───────────────────────────────────────┴──────────────────────────────────────────┴───────────────────┘
w
3 Incoming INMARSAT aeronautical logic procedures (Air-to-ground calls)
Figure 1/Q.1112 contains the procedures for the incoming INMARSAT aeronautical signalling
system.
This description only includes those aspects of the INMARSAT aeronautical system which have to
be implemented for interworking purposes. Internal procedures, such as those
required for setting up and clearing satellite channels are not shown. This also applies
to pre-emption procedures for assigning channels to distress calls.
The following details should be noted:
3.1 The access request contains information elements for the required service, and the required
network, plus two address digits. For some private networks, and/or subscription
services on public networks, this information will be sufficient to determine the
complete call routing. In all but the most exceptional cases, it will be enough
information to select a circuit for onward routing from the MSSC.
3.2 The initial analysis of the request checks that the AES is authorized for the service
requested and finds a suitable channel and channel unit, on which to service the
call. The call is aborted if the AES is not an authorized user of the INMARSAT system.
3.3 In the cases where all of the required address information is contained in the access request
signal unit, an address message is received by the incoming procedure, once
continuity of the assigned satellite channel has been successfully tested.
3.4 The called address is analysed to verify its integrity. The satellite channel may be cleared at
this point, either if the dialled address is incomplete or if the AES goes on-hook.
The call may also be aborted if proper credit card data is not received from the
AES.
3.5 The dialled digits are transferred to the interworking procedure, and the answer signal is
awaited. The last digit may be withheld until receipt of credit card information.
All successful address complete signals are converted to a call attempt result
message, with the cause field set to address complete.
3.6 Unsuccessful call event signals (BITEs 9-20) are transferred to the AES by the call attempt
result message, with the cause field set appropriately.
3.7 On receipt of the answer signals, the connect message is sent to the AES.
3.8 The call is cleared in the normal way, either on receipt of a release message from the
interworking procedure, or an indication of AES on-hook conveyed by means of a
channel release message.
wNote 1w - Analyze for authorized AES ID, availability of service requested, find a suitable
satellite channel and channel unit.
wNote 2w - Includes translation of prefixes to the appropriate B-party number, and verification that
the number is valid.
FIGURE 1/Q.1152 (sheet 1 of 3)
Logic procedures for incoming INMARSAT aeronautical signalling
(air-to-ground calls)
FIGURE 1/Q.1152 (sheet 2 of 3)
Logic procedures for incoming INMARSAT aeronautical signalling
(air-to-ground calls)
FIGURE 1/Q.1152 (sheet 3 of 3)
Logic procedures for incoming INMARSAT aeronautical signalling
(air-to-ground calls)
