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Q.1112 y:(  x|@   Fascicle VI.14 Rec. Q.1112 y   Recommendation Q.1112  PROCEDURES FOR INTERWORKING BETWEEN INMARSAT STANDARD B SYSTEM AND THE ă *  INTERNATIONAL PUBLIC SWITCHED TELEPHONE NETWORK/ISDN ă 1  Introduction  This Recommendation presents the detailed procedures for interworking between INMARSAT StandardB system and signalling systems of the fixed network. For a brief description of INMARSAT StandardB system, see Appendix I to Recommendation Q.1111. 2  Conversion of information elements  Tables 1/Q.1112 to 16/Q.1112 give the relationship between signals of the fixed network signalling systems and the INMARSAT StandardB system. 2.1Signalling System No. 7 (TUP)  2.1.1Table 1/Q.1112 gives the relationship between forward signals in Signalling System No. 7 TUP and messages and information elements sent on the radio path in INMARSAT StandardB signalling system for shore to ship calls, i.e. interworking of Signalling System No. 7 TUP to INMARSAT StandardB. In the comment column actions taken by the MSSC are indicated, in particular for signals of TUP which have no equivalent message or information element in INMARSAT StandardB.  Table 2/Q.1112 shows the relationship between messages and information elements in INMARSAT StandardB signalling system and forward signals in Signalling System No. 7 TUP for shiptoshore calls, i.e. interworking of INMARSAT StandardB to Signalling System No. 7 TUP.  The signal numbers for forward signals of Signalling System No. 7 TUP are those given in Table A5bis of Annex A to Recommendations Q.601Q.608.  2.1.2Table 3/Q.1112 gives the relationship between messages and information elements in INMARSAT StandardB signalling system and backward signals in Signalling System No. 7 TUP for shoretoship calls, i.e, interworking of Signalling System No. 7 to INMARSAT StandardB.  Backward signals in Signalling System No. 7 TUP generated by the MSSC for unsuccessful shore toship calls are given in Table 3bis/Q.1112. These signals are not related to any specific message or information element received from the ship earth station.  Table 4/Q.1112 gives the relationship between backward signals in Signalling System No. 7 TUP and messages and information elements in INMARSAT StandardB signalling system for shiptoshore calls, i.e. interworking of INMARSAT StandardB to Signalling System No. 7 TUP. The comments column indicates specific actions taken by the MSSC.  The signal numbers for backward signals of Signalling System No. 7 TUP are those given in Table A9bis of Annex A to Recommendations Q.601Q.608. 2.2wSignalling System R2w  2.2.1Tables 5/Q.1112 and 6/Q.1112 are similar to Tables 1/Q.1112 and 2/Q.1112, respectively, and apply to forward signals in Signalling System R2.  The signal numbers for forward signals of Signalling System R2 are those of TableA7 of AnnexA to RecommendationsQ.601Q.608.  2.2.2Tables 7/Q.1112, 7bis/Q.1112 abd 8/Q.1112 are similar to Tables 3/Q.1112, 3bis/Q.1112 and 4/Q.1112, respectively, and appy to backward signals in Signalling System R2.  The signal numbers for backward signals in Signalling System R2 are those of TableA11 of AnnexA to Recommendations Q.601Q.608. 0Ԍ 2.3wSignalling System No. 7 (ISUP)w  The relationship between forward and backward signals of Signalling SystemNo.7 ISUP and messages and information elements of INMARSAT StandardB signalling system is for further study. Tables9/Q.1112 through 12/Q.1112 are reserved for this purpose. 2.4wSignalling System No. 5w  2.4.1Tables 12/Q.1112 and 14/Q.1112 are similar to Tables 1/Q.1112 and 2/Q.1112, respectively, and apply to forward signals in Signalling System No. 5.  the signal numbers for forward signals in Signalling System No.5 are those given in TableA4 AnnexA to Recommendations Q.601Q.608.  2.4.2Tables 15/Q.1112, 15bis/Q.1112 and 16/Q.1112 are similar to Tables 3/Q.1112, 3bis/Q.1112 and 4/Q.1112, 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 TableA8 of AnnexA to Recommendations Q.601Q.608.   #TABLE 1/Q.1112 *  Conversion of forward signals in Signalling System No. 7 TUP ă  and INMARSAT StandardB Signalling System ă ! shoretoship calls ă   ( ")x-X8 x|@ w        Signalling System No. 7  INMARSAT StandardB    Comments    Signal  Signal name  Message:      No.   info element: value         Announcement message:      1  Address signals  SES number, called terminal       Nature of address indicator   Interpreted and     2 national significant number   used by MSSC      Nature of address indicator   Interpreted and     3 international number   used by MSSC      Nature of circuit indicator   Ignored by     4 one satellite in connection   MSSC      Nature of circuit indicator   Ignored by     5 one satellite in connection   MSSC      Echo suppressor indicator   MSSC will insert     6 outgoing halfecho  echo control device     suppressor not included   if needed      Echo suppressor indicator   Interpreted and     7 outgoing halfecho   used by MSSC     suppressor included        Calling party's category  Assignment message:      812 indicator, language digit  service: telephone        priority: routine       Calling party's category  Assignment message:   /Ԍ   13 indicator, ordinary calling  service: telephone      subscriber  priority: routine       Calling party's category  Assignment message:      14 indicator, calling  service: telephone      subscriber with priority  priority: further study       w  tTABLE 1/Q.1112 w(contd.)wă t) t Conversion of forward signals in Signalling System No. 7 TUP ă t and INMARSAT StandardB Signalling System ă t shoretoship calls ă   w        Signalling System No. 7  INMARSAT StandardB    Comments    Signal  Signal name  Message:      No.   info element: value       Calling party's category   Not applicable     15 indicator, data call        16 Clear forward signal  Channel release message       17 Forward transfer signal   Not applicable      18 Continuity proved   Interpreted and        used by MSSC      19 Continuity check failure  Channel release message       Continuity check required   Interpreted by     20 on this circuit   MSSC      Continuity check not   Interpreted by     21 required on this circuit   MSSC      Continuity check performed   Interpreted and     22 on previous circuit   used by MSSC      Service information   Interpreted by     23    MSSC      General setup message   Interpreted by     24    MSSC             w / t) t"TABLE 2/Q.1112 t Conversion of forward signals in Signalling System No. 7 TUP ă t and INMARSAT StandardB Signalling System ă t shiptoshore calls ă   w       INMARSAT standardB  Signalling system No. 7    Message: info element: value  Signal name Signal No.    Address message:  Address signals:  1   called number Nature of address indicator  2 or 3    Request message: Calling party's category    priority: routine  indicator, ordinary  13   service: telephone or 3.1 kHz audio  calling subscriber     Request message: Calling party's category    priority: urgency, safety or distress indicator, calling  14   service: telephone or 3.1 kHz audio subscriber with priority     Channel release message  Clear forward signal  16      Continuity check    Continuity check tone  performed on previous  22     circuit      X8XX8w   XXwNotew Nature of circuit indicator, one satellite in connection (Signal No. 5) is generated by the MSSC.'X    ~   XX8X8t"TABLE 3/Q.1112 t Conversion of backward signals in Signalling System No. 7 TUP ă t and INMARSAT StandardB Signalling System ă t shoretoship calls ă   w       INMARSAT standardB  Signalling system No. 7    Message: info element: value  Singal name Signal No.    Continuity check tone  AFC: Address complete  4     subscriber free, charge     Connect message  ANC: Answer charge  16    Channel release message  CLB: Clear back  19    Call 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 info tone  14       w  t!TABLE 3bis/Q.1112 t Unsuccessful call events and backward signals in ă t Signalling System No. 7 TUP ă t shoretoship calls ă   w       INMARSAT standardB  Signalling system No. 7    Event in INMARSAT system  Signal name  Signal No.    Congestion in MSSC  SEC: switching equipment  7     congestion     No satellite channel available  NNC: National network  9     congestion     Incomplete SES number  ADI: Address incomplete  10    Unallocated SES number  UNN: Unallocated number  11    SES busy  SGB: Subscriber busy  12    Continuity test failure  LOS: Line out of service  13    SES absent (no response)  SST: Send special  14     information tone     SES barred for incoming access  SST: Send special  14     information tone     SES unauthorized  SST: Send special  14     information tone        w  t"TABLE 4/Q.1112 t Conversion of backward signals in Signalling System No. 7 TUP ă t and INMARSAT Standard B Signalling System ă t shiptoshore calls ă   w        Signalling system No. 7  INMARSAT standardB    Signal  Signal name  Message:  Comments    No.   info element: value      1  ADC: Address complete,  Connect through     charge   circuit     2  ADN: Address complete,  Nocharge infor     no charge   mation used by       MSSC only     3  ADX: Address complete,  Connect through     coinbox   circuit     4  AFC: Address complete,  Connect through     subscriber free, charge   circuit     5  AFN: Address complete,  Nocharge infor     subscriber free, no charge   mation used by       MSSC only     6  AFX: Address complete,   Connect through     subscriber free, coinbox   circuit       Call result message:     7  SEC: Switching equipment  international network,      congestion  switching equipment       congestion       CGC: Circuitgroup  Call result message:     8  congestion  international network,       no channel available        Call result message:     9  NNC: National network  remote public network,      congestion  switching equipment       congestion        Call result message:     10  ADI: Address incomplete remote public network,      invalid number format        w %  tTABLE 4/Q.1112w (contd.)wă t Conversion of backward signals in Signalling System No. 7 TUP ă t and INMARSAT StandardB Signalling System ă t shiptoshore calls ă   w        Signalling system No. 7  INMARSAT standardB    Signal  Signal name  Message:  Comments    No.   info element: value        Call result message:     11  UNN: Unallocated number remote public network,       unassigned number        Call result message:     12  SGB: Subscriber busy remote public network,       user busy       Call result message:      13  LOS: line out of service  remote public network,       destination out of       service       SST: Send special  Call result message:     14  information tone  international network,       unspecified        Call result message:     15  CFL: Call failure  international network,       unspecified      16  ANC: Answer, charge  Connect message         Nocharge    17  ANN: Answer, no charge  Connect message  information      used by MSSC only        Clearback    18  RAN: Reanswer   supervision done       by MSSC        Clearback    19  CLB: Clearback  Channel release  supervision       done by MSSC     20  GRQ: General request   Interpreted by     message   MSSC      Call unsuccessful  Call result message:     21  access barred  remote public network,       unspecified      22  DPN: Call unsuccessful   For further    digital path not provided   study       w +  t"TABLE 5/Q.1112 t Conversion of forward signals in Signalling System R2 and ă t INMARSAT StandardB Signalling System ă t shoretoship calls ă   w        Signalling system R2  INMARSAT standardB      Signal  Signal name  Message:  Comments    No.   info element: value       Announcement message:     1  Address signals  SES number, called       terminal      27  Language digit,   Ignored by MSSC     discriminating digit       I11: Country code indicator,  MSSC will suppress     outgoing halfecho   the country code    8  suppressor required   and insert echo       control device if       needed     I12: Country code indicator,   The MSSC will    9  no echo suppressor   suppress the     required   country code     I14: Country code indicator,   The MSSC will    10  incoming halfecho   suppress the     suppressor required   country code     11 I14: Incoming halfecho   Interpreted by     suppressor required   MSSC     II7: Calling party's  Assignment message:     12  category, subscriber or  service: telephone      operation without  priority: routine      forward transfer       facility       II8: Calling party's      13  category, data   Not applicable     transmission control       II9: Calling party's  Assignment message:     14  category, subscriber  service: telephone      with priority  priority: for       further study      w V'    t) tTABLE 5/Q.1112 (contd)   w        Signalling system R2  INMARSAT standardB      Signal  Signal name  Message:  Comments    No.   info element: value      II10: Calling party's  Assignment message:     15  category, operator  service telephone      with forward transfer  priority: routine      facility       16  Clear forward signal  Channel release       message      17  Forward transfer signal   Not applicable     18  First digit I1......I10   Interpreted and       used by MSSC     19  Reply to A14   Not applicable    2021  Reply to A13   Not applicable       w t) t) t) t"TABLE 6/Q.1112 t Conversion of forward signals in Signalling System R2 ă t and INMARSAT StandardB Signalling System ă t shiptoshore calls ă   w % %       INMARSAT standardB  Signalling system R2     Message: info element: value  Signal name  Signal No.     Address message:  Address signals:  1    called number  Country code indicator  10     Request message:  II7: Calling party's     priority: routine  category, subscriber  12    service: telephone or  or operator without     3.1 kHz audio  forward transfer facility      Request message:      priority: urgency, safety  II9: Calling party's     or distress  category, subscriber with  14    service: telephone or  priority     3.1 kHz audio       Channel release message  Clear forward signal  16     Continuity check tone  Not applicable        w /  t) t"TABLE 7/Q.1112 t Conversion of backward signals in Signalling System R2 ă t and INMARSAT StandardB Signalling System ă t shoretoship calls ă   w        INMARSAT standardB  Signalling system R2     Message: info element: value  Signal name  Signal No.     Continuity check tone  International, subscriber  13     line free, charge      Connect message  Answer signal  11     Channel release message  Clear back signal  12    Call result message: cause value:      user busy  Subscriber line busy  5    no Channel available  Congestion on the national  1     network     destination out of service Subscriber line out of order  10    others  International, send  14     special info tone        w   t!TABLE 7bis/Q.1112 t Unsuccessful call events and backward signals in ă t Signalling System R2 ă t shoretoship calls ă   w        INMARSAT standardB  Signalling system R2    Signal No.    Event in INMARSAT system  Signal name       A4: Congestion on the  1    Congestion in MSSC  national network      or  or     B4: Congestion  6      A4: Congestion on the  1    No satellite channel available  national network      or  or     B4: Congestion  6     Incomplete SES number  B5: Unallocated number  7     Unallocated SES number  B5: Unallocated number  7     SES busy  B3: Subscriber line busy  5     Continuity test failure  B8: Subscriber line  10     out of order      SES absent (no response)  B2: Send special  4     information tone      SES barred for incoming  B2: Send special  4    access  information tone      SES unauthorised  B2: Send special  4     information tone        w  t"TABLE 8/Q.1112 t Conversion of backward signals in Signalling System R2 ă t and INMARSAT StandardB Signalling System ă t shiptoshore calls ă   w        Signalling system R2  INMARSAT standardB    Signal  Signal name  Message:  Comments    No.   info element: value        Call result message:     1  A4: Congestion on the  remote public network      national network  switching equipment       congestion      2 A6: Address complete charge,   Connect through     set up speech conditions   circuit      A15: Congestion in an  Call result message:     3  international exchange or  international network,      at its output  switching equipment       congestion       B2: Send special  Call result message:     4  information tone  remote public network,       unspecified        Call result message:     5  B3: Subscriber line busy  remote public network,       user busy        Call result message:     6  B4: Congestion  remote public network,       switching equipment       congestion        Call result message:     7  B5: Unallocated number  remote public network,       unassigned number      8  B6: Subscriber line free,   Connect through     charge   circuit      B7: Subscriber line free,  Nocharge infor    9  no charge   mation used by       MSSC only       w  % tTABLE 8/Q.1112 w(contd.)wă t Conversion of backward signals in Signalling System R2 ă t and INMARSAT StandardB Signalling System ă t shiptoshore calls ă   w     X   Signalling system R2  INMARSAT standardB    Signal  Signal name  Message:  Comments    No.   info element: value        Call result message:     10  B8: Subscriber line  remote public network,      out of order  destination out of       service      11  Answer signal  Connect message Clearback super       vision by MSSC     12  Clear back signal  Channel release      13  B1: International, sub   Connect through     scriber line free, charge   circuit      B9, B10: International,  Call result message:     14  send special information international network,      tone  unspecified        Call result message:     15  B11 to B15  remote public network,       switching equipment       congestion       X w  t"TABLE 9/Q.1112 t Conversion of forward signals in Signalling System No. 7 ă t ISUP and INMARSAT StandardB Signalling System ă t shoretoship calls ă XFor further study. t"TABLE 10/Q.1112 t) t Conversion of forward signals in Signalling System No. 7 ă t ISUP and INMARSAT StandardB Signalling System ă t shiptoshore calls ă t) XFor further study. t"TABLE 11/Q.1112 t) t Conversion of backward signals in Signalling System No. 7 ă t ISUP and INMARSAT StandardB Signalling System ă t shoretoship calls ă XFor further study. t TABLE 11bis/Q.1112 t) t Unsuccessful call events and backward signals in ă t Signalling System No. 7 ISUP and ă t INMARSAT StandardB Signalling System ă t shoretoship calls ă XFor further study. t"TABLE 12/Q.1112 t) t Conversion of backward signals in Signalling System No. 7 ă t ISUP and INMARSAT StandardB Signalling System ă t shiptoshore calls ă XFor further study.  N* t"TABLE 13/Q.1112 t) t Conversion of forward signals in Signalling System No. 5 ă t and INMARSAT StandardB Signalling System ă t shoretoship calls ă   w     h 8  Signalling system No. 5  INMARSAT standardB   8  8  Signal  Signal name  Message: info element:  Comments  8  No.   value   8 8  1  Address signal  Announcement message:   8    SES number, called terminal   8      8  216  Language digit   Interpreted by  8     MSSC  8      8  7  Discriminating digit O  Announcement message:   8    service: telephone   8      8  8  Start of pulsing KP1   Interpreted by  8     MSSC  8      8  9  Start of pulsing KP2   Interpreted by  8     MSSC  8      8  10  Clear forward message  Channel release   8      8  11  Forward transfer   Not applicable  8    h w t) t"TABLE 14/Q.1112 t Conversion of forward signals in Signalling System No. 5 ă t and INMARSAT StandardB Signalling System ă t shiptoshore calls ă   w        INMARSAT standardB  signalling system No. 5     Message: info element: value  Signal name  Signal No.     Address Message: Called number  Address signals  1     start of pulsing KP1 or  8     start of pulsing KP2  9         Continuity check tone  Not applicable          Channel release message  Clear forward  10         Request message:  Discriminating digit O  7    priority: routine      service: telephone or      3.1 kHz audio           Request message:  Discriminating digit O  7    priority: urgency, safety      or distress      service: telephone or      3.1 kHz audio         w >0 t TABLE 15/Q.1112 t Conversion of backward signals in Signalling System No. 5 ă t and INMARSAT StandardB Signalling System ă t shoretoship calls ă   w        INMARSAT standardB  Signalling system No.5    Message: info element: value  Signal name  Signal      No.     Continuity check tone  Inform that ST has been sent  5         Connect message  Answer signal  2         Channel release  Clear back  3         Call attempt result: Cause value      User busy  Busy flash signal  1    No channel available  Busy flash signal  1    Destination out of service  Information tone (Note)     Others  Information tone (Note)        w XwNotew May include appropriate recorded announcement. t TABLE 15bis/Q.1112 t Unsuccessful call events and backward signals in ă t Signalling System No. 5 ă t shoretoship calls ă   w % %       Events in INMARSAT system  Signalling system No. 5     Message: info element: value  Signal name  Signal No.     Congestion in MSSC  Busy flash  1         No satellite channel available  Busy flash  1         SES busy  Busy flash  1         Incomplete SES number  Information tone (Note)          Unallocated SES number  Information tone (Note)          Continuity test failure  Information tone (Note)          SES absent  Information tone (Note)          SES barred  Information tone (Note)          SES unauthorised  Information tone (Note)        w XwNotew May include appropriate recorded announcement  >0Ԍt TABLE 16/Q.1112 t Conversion of backward signals in Signalling System No. 5 ă t and INMARSAT StandardB Signalling System ă t shiptoshore calls ă   w       Signalling system No. 5  INMARSAT standardB     Signal No.  Signal name  Message: info element: value  Comments     1  Busy Flash  Call Result: international       network, unspecified           2  Answer signal  Connect           3  Clear back  Channel release           4  Proceed to send            5  Inform that ST has       been sent       w   X8( ")x-    6'6'StandardC6QMS $=R6'6'StandardC6QMS $=R- y::v  x|@   Fascicle VI.14 Rec. Q.1112 y::v x|@  Fascicle VI.14 Rec. Q.1112    3  Incoming INMARSAT procedures (shiptoshore calls)  Figure 1/Q.1112 contains the procedures for the incoming INMARSAT StandardB system.  This description only includes those aspects of the INMARSAT StandardB system which have to be implemented for interworking purposes. Internal procedures, such as those required for setting up/clearing the satellite channel, are not shown. This also applies to preemption procedures for assigning channels to distress calls. The following details should be noted.  3.1A call is initiated by a ship earth station (SES), by means of an "access request" message. The coast earth station (CES) begins to set up a channel for the voice communication, upon receipt of this message. The call may be aborted at this point, if the requested service is not available, a satellite circuit is not available, or the calling SES is not authorized. The SES is informed of the call abortion by means of a "call result" message.  3.2The called address and other information required for call setup is contained in the service address message received from the ship.  Digit analysis (SPITE 12) commences when the service address has been received. This includes also check of address validity, and translation of prefixes to the appropriate destination number.  Unsuccessful events, shown as SPITEs 13,15,16,17,18 and 19, are indicated to the ship earth station by call result message with the cause field set as shown in Table 17/Q.1112.  The calling party's category indications used are related to information elements of the request message as shown in Table 18/Q.1112.  >0Ԍ* #TABLE 17/Q.1112 * *  Relationship between result of digit analysis ă  and cause field in call result messages ă   x|@ w      SPITE  Cause field    13: Digit analysis  Local network, invalid number format       15: Unallocated number  Local network, unassigned number       16: Unprovided routing  Local network, no route to destination       17: Barred routing  Local network, call rejected       18: Switching equipment  Local network, switching equipment    congestion  congestion       19: Circuit group congestion  Local network, no circuit available      ( ")x-X8"%w  L t"TABLE 18/Q.1112 t) t Calling Party's category indications used for calls in ă t INMARSAT StandardB Signalling System ă   w        INMARSAT information elements  Calling party's category fite     Priority: routine  17: Subscriber, ordinary call    Service: telephone or 3.1 kHz audio         Priority: urgency, safety or distress  18: Subscriber, call with    Service: telephone or 3.1 kHz audio  priority       w  3.3XThe interworking procedure is activated when countinuity of the satellite circuit has been established. If there is no outgoing circuit available in the MSSC at that time, the satellite circuit is cleared by a call result message with the cause field set to "local network, no circuit available".  3.4XUpon receipt of an address complete indication (BITE 27) or an address complete, subscriber free signal (BITEs 5, 6 or 7) the circuit is throughconnected in the MSSC in order to allow supervisory tones to be passed to the ship earth station.  3.5XFor unsuccessful call setup one of the following BITEs may be received from the interworking procedure: BITEs 9 through 17, 19 and 20. The corresponding cause indicated in the call result message sent to the ship earth station should be as shown in Table 19/Q.1112.   #TABLE 19/Q.1112 *  Relationship between unsuccessful call BITEs and cause field ă  in call result messages ă    w        BITE  Cause field     9: Switching equipment congestion  International network, switching     equipment congestion       10: Circuit group congestion  International network, no channel     available       11: Switching equipment congestion  International network, switching    or circuit group congestion  equipment congestion       12: National network congestion  Remote public network, switching     equipment congestion       13: Address complete, national  Remote public network switching    network congestion  equipment congestion       14: Address incomplete  Remote public network, invalid     number format       15: Unallocated number  Remote public network, unassigned     number       16: Address complete, subscriber busy  Remote public network, user busy       17: Address complete, line out of service  Remote public network,     destination out of service       19: Call failure  International network,     unspecified       20: Send special information tone  International network,     unspecified       w XwNotew See also Tables 4/Q.1112, 8/Q.1112 and 16/Q.1112. 3.6XThe connect message is sent when an answer signal is received.  3.7XClear back from the fixed network is not immediately relayed to the ship earth station. However, clearback supervision is done by the interworking procedure.  XNormal clearing takes place when a channel release signal is received from the ship earth station or a clearback indication (BITE 25) is received from the interworking procedure. BITE 25 is generated when the timer defined in Recommendation Q.118,  4.3.2 expires, (see the various interworking procedures defined below). 3.8XAdditional procedures required for interworking with ISUP are for further study. + FIGURE 1/Q.1112 (sheet 1 of 3)  Logic procedures for incoming INMARSAT Standard B signalling ă  (ship to shore calls) ă  FIGURE 1/Q.1112 (sheet 2 of 3)  Logic procedures for incoming INMARSAT Standard B signalling ă  (ship to shore calls) ă  FIGURE 1/Q.1112 (sheet 3 of 3)  Logic procedures for incoming INMARSAT Standard B signalling ă  (ship to shore calls) ă  4 X Outgoing INMARSAT procedures (shoretoship calls)  XFigure 2/Q.1112 contains the procedures for the outgoing INMARSAT StandardB Signalling System.  XThis description only includes those aspects of the INMARSAT StandardB system which have to be implemented for interworking purposes. Internal procedures, such as those required for setting up and clearing the satellite channel, are not shown. This also applies to preemption procedures for assigning channels to distress calls. XThe following details should be noted.  4.1 XThe satellite circuit is established when all digits of the SES number have been received. The MSSC will check if the SES is barred for incoming calls or busy. This may involve information exchange with the Network Coordination Station. Call barring is indicated to the fixed network by use of BITE 20: send special information tone. For ISDN interworking (Signalling System No. 7) the cause may be indicated more precisely.  4.2XCalling party's category indicators are converted to information elements in INMARSAT StandardB signalling system as shown in Table 20/Q.1112. #TABLE 20/Q.1112  Conversion of calling party's category indicators to information ă  elements in INMARSAT StandardB Signalling System ă   w        Calling party's  Information elements in    category indicator FITE  INMARSAT     913: Operator, language     indication     14: Operator with forward     transfer facility     15: Subscriber  Priority: routine    16: Subscriber or operator with  Service: telephone    forward transfer facility     17: Subscriber, ordinary call     18: Subscriber, call with  Priority: for further study    priority  Service : telephone    19: Data call  Priority: routine     Service: telephone (3.1 kHz     audio)       w XwNotew FITEs 916 are converted to FITE 17 by the interworking procedure. 4.3XThe following events may occur during call setup:  X88 the SES is busy (BITE 16); this is indicated by the NCS during call setup;'8  +  X88 there is no available satellite channel for the requested service; in this case network congestion indication (BITE 12) is provided back to the fixed network;'8  X88 the continuity test may fail; in this case the subscriber line out of service indication (BITE 17) is used.'8  XIf the called terminal on the ship is not available (even though the SES could make the connection) or does not support the requested service type, the SES will indicate this by a call result message. This is for further study.  4.4XWhen a clear forward signal is received from the fixed network, the MSSC will clear the satellite circuit with a channel release message.  XThe ship earth station may clear the satellite circuit by sending a channel release message to the MSSC. When receiving such a message, the MSSC will initiate clearing of the satellite circuit and provide a clearback signal to the fixed network.  XPrecautions should be taken at the ship earth station in order to avoid unintentional clearing by the user. This could be done by allowing some time (e.g. five seconds) for a reanswer signal to appear before the channel release message is sent to the MSSC.  XThe MSSC may also release the circuit if problems are detected on the radio path. In this case also a clearback signal should be provided to the fixed network. 4.5XAdditional procedures required for interworking with ISUP are for further study.  FIGURE 2/Q.1112 (sheet 1 of 3)  Logic procedures for outgoing INMARSAT Standard B signalling ă  (shore to ship calls) ă  FIGURE 2/Q.1112 (sheet 2 of 3)  Logic procedures for outgoing INMARSAT Standard B signalling ă  (shore to ship calls) ă  FIGURE 2/Q.1112 (sheet 3 of 3)  Logic procedures for outgoing INMARSAT Standard B signalling ă  (shore to ship calls) ă  5 X Interworking of incoming INMARSAT to outgoing INMARSAT  5.1XFigure 3/Q.1112 contains the procedures for interworking between incoming and outgoing procedures of INMARSAT StandardB signalling system.  XThese procedures may also apply for interworking with the INMARSAT StandardB and StandardA systems.  5.2XThe interworking procedure supervises the answer time (timer t1). The value of timer t1 is two to four minutes in compliance with Recommendation Q.118,  4.3.1. l  FIGURE 3/Q.1112 (sheet 1 of 2)  Interworking of INMARSAT Standard B System with itself ă :! FIGURE 3/Q.1112 (sheet 2 of 2)  Interworking of INMARSAT Standard B System with itself ă 6 X Interworking of Signalling System R2 to outgoing INMARSAT  6.1XFigure 4/Q.1112 contains the procedures for interworking of Signalling System R2 to INMARSAT StandardB signalling system.  6.2XThe ringing tone towards the calling subscriber of the fixed network is intitiated by the interworking procedure. The tone should have characteristics in accordance with Recommendation Q.35. " FIGURE 4/Q.1112 (sheet 1 of 2)  Interworking of Signalling System R2 to INMARSAT Standard B System ă :# FIGURE 4/Q.1112 (sheet 2 of 2)  Interworking of Signalling System R2 to INMARSAT Standard B System ă :$ 7 X Interworking of incoming INMARSAT to Signalling System R2  7.1XFigure 5/Q.1112 contains the procedure for interworking of Signalling System R2 to INMARSAT StandardB signalling system.  7.2XIf the call is destined to a country whose ISC has direct connection to the MSSC (result of SPITE 22, transit connection following?), the country code not included indication (FITE 2) is provided to the outgoing Signalling System R2 procedure. This indication is followed by an echo suppressor indicator (FITE 4 or FITE 5). FITE 4 is used when an incoming echo control device is not required for the call (e.g. data call); otherwise FITE 5 should be used.  XFor calls requiring a transit ISC the country code indicator FITE 7 or FITE 8 should be used. FITE 7 is used when an incoming echo control device is not required at the remote end and FITE 8 when such a device is to be inserted. XSee also Recommendation Q.1111 for control of echo control devices.  7.3XThe interworking procedure supervises the answer time and the clearback time (timers t1 and t2, respectively). XTimers t1 and t2 take values as follows: Xt1 = two to four minutes, Recommendation Q.118,  4.3.1 Xt2 = one to two minutes, Recommendation Q.118,  4.3.2.  XWhen timer t1 expires, a forced release message is returned to the incoming INMARSAT procedure (BITE 29). When timer t2 expires, a clearback message is sent to the incoming INMARSAT procedure (BITE 25). D% FIGURE 5/Q.1112 (sheet 1 of 3)  Interworking of INMARSAT Standard B System to Signalling System R2 ă :& FIGURE 5/Q.1112 (sheet 2 of 3)  Interworking of INMARSAT Standard B System to Signalling System R2 ă :' FIGURE 5/Q.1112 (sheet 3 of 3)  Interworking of INMARSAT Standard B System to Signalling System R2 ă 8 X Interworking of Signalling System No. 7 TUP to outgoing INMARSAT  8.1XFigure 6/Q.1112 contains the procedures for interworking of Signalling System No. 7 TUP to INMARSAT StandardB signalling system.  8.2XActivation of the outgoing INMARSAT procedure takes place when a continuity indicator (FITE 24 or FITE 25) is received from Signalling System No. 7. Any digits received during this time are stored by the interworking procedure and then provided to the outgoing INMARSAT procedure when continuity has been indicated.  8.3XThe ringing tone towards the calling subscriber of the fixed network is initiated by the interworking procedure. The tone should have characteristics in accordance with Recommendation Q.35. FIGURE 6/Q.1112 (sheet 1 of 2)  Interworking of Signalling System No. 7 TUP of INMARSAT Standard B System ă ( FIGURE 6/Q.1112 (sheet 2 of 2)  Interworking of Signalling System No. 7 TUP of INMARSAT Standard B System ă :) 9 X Interworking of incoming INMARSAT to Signalling System No. 7 TUP  9.1XFigure 7/Q.1112 contains the procedures for interworking of incoming INMARSAT StandardB signalling system to Signalling System No. 7 TUP.  9.2XThe interworking procedure provides the following information to the outgoing Signalling System No. 7 procedure in order to initialize the information elements of the initial address message. X88 continuity check required or not required (FITE 25 or FITE 26);'8 X88 one satellite link included (FITE 21);'8  X88 country code indicator: FITE 2 if the call is destined for a country whose ISC has direct connections to the MSSC and FITE 3 in all other cases;'8  X88 echo control indicator: FITE 4 when an echo control device is not required and FITE 5 when such a device is required at the incoming end.'8  9.3XThe interworking procedure supervises the answer time and the clearback time (timers t1 and t2, respectively). XTimers t1 and t2 take values as follows: Xt1 = two to four minutes, Recommendation Q.118, 4.3.1 Xt2 = one to two minutes, Recommendation Q.118, 4.3.2.  XWhen timer t1 expires, a forced release message is returned to the incoming INMARSAT procedure (BITE 29). When timer t2 expires, a clearback message is sent to the incoming INMARSAT procedure (BITE 25). * FIGURE 7/Q.1112 (sheet 1 of 3)  Interworking of INMARSAT Standard B System to Signalling System No. 7 TUP ă :+ FIGURE 7/Q.1112 (sheet 2 of 3)  Interworking of INMARSAT Standard B System to Signalling System No. 7 TUP ă :, FIGURE 7/Q.1112 (sheet 3 of 3)  Interworking of INMARSAT Standard B System to Signalling System No. 7 TUP ă :- 10 X Interworking of Signalling System No. 7 ISUP to outgoing INMARSAT XFor further study. 11 X Interworking of incoming INMARSAT to Signalling System No. 7 ISUP XFor further study. 12 X Interworking of Signalling System No. 5 to outgoing INMARSAT  XFigure 8/Q.1112 contains the procedures for the interworking of Signalling System No. 5 to the INMARSAT StandardB signalling system. 13 X Interworking of incoming INMARSAT to Signalling System No. 5  XFigure 9/Q.1112 contains the procedures for the interworking of INMARSAT StandardB signalling system to Signalling System No. 5. T. FIGURE 8/Q.1112 (sheet 1 of 2)  Interworking of Signalling System No. 5 to INMARSAT Standard B System ă :/ FIGURE 8/Q.1112 (sheet 2 of 2)  Interworking of Signalling System No. 5 to INMARSAT Standard B System ă :0 FIGURE 9/Q.1112 (sheet 1 of 3)  Interworking of INMARSAT Standard B System to Signalling System No. 5 ă :1 FIGURE 9/Q.1112 (sheet 2 of 3)  Interworking of INMARSAT Standard B System to Signalling System No. 5 ă :2 FIGURE 9/Q.1112 (sheet 3 of 3)  Interworking of INMARSAT Standard B System to Signalling System No. 5 ă