(r3) ProtocolISUP < Public

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---+++ ISUP (ISDN User Part)

Протокол прикладного уровня подсистемы ISDN (<b>IS</b>DN <b>U</b>ser <b>P</b>art). Обеспечивает взаимодействие между телефонными коммутаторами для управления телефонными вызовами, а также услугами ISDN. 

В качестве транспортного уровня может использовать:
   * [[ProtocolMTP3][MTP3 ]]
   * [[ProtocolM3UA][M3UA]]



---++++ Пример дешифрации
<verbatim>
      10...... Network indicator............. National network
      4 ***b14** Destination point code........ 2056 Dec
        ***b14** Originating point code........ 3073 Dec
        1100.... Signalling link selection..... 12 Dec

ISUP-R-2000: Russian specifications, 2001
      8 ***b12** Circuit identification code... 284 Dec
        0000.... Spare......................... 0
     10 00000001 Message Type.................. INITIAL ADDRESS
 
     -- Nature of connection indicators
     11 ......00 Satellite ind................. No satellite circuit
        ....00.. Continuity check ind.......... Not required
        ...0.... Echo control device........... Not included
        000..... Spare......................... 0
 
     -- Forward call indicators
     12 .......0 National/international ind.... National call
        .....00. End-to-end method ind......... No method available
        ....1... Interworking ind.............. Encountered
        ...0.... End-to-end info ind........... Not available
        ..0..... ISDN user part ind............ Not used all the way
        01...... ISUP preference ind........... Not required all the way
     13 .......0 ISDN access ind............... Originating access non-ISDN
        .....00. SCCP method ind............... No indication
        00000... Spare......................... 0
 
     -- Calling Party's Category
     14 00001010 Category...................... Ordinary calling sub. cat. 1
 
     -- Transmission medium requirement
     15 00000011 Transmission medium req....... 3.1 kHz audio
 
     16 00000010 Pointer....................... 2 Dec
     17 00001010 Pointer....................... 10 Dec
     18 00001000 Length........................ 8 Dec
 
     -- Called Party Number
     19 .0000011 Nature of address ind......... National (significant) number
        1....... Odd/even ind.................. Odd
     20 ....0000 Spare......................... 0
        .001.... Numbering plan ind............ ISDN (Telephony)
        1....... Internal network number ind... Routing not allowed
     21 ***b44** Address signal................ 9062743318F
        0000.... Filler........................ 0 Hex
 
     27 00001010 Optional parameter............ Calling Party Number
     28 00000111 Length........................ 7 Dec
 
     -- Calling Party Number
     29 .0000011 Nature of address ind......... National (significant) number
        0....... Odd/even ind.................. Even
     30 ......11 Screening ind................. Network provided
        ....00.. Presentation restricted ind... Presentation allowed
        .001.... Numbering plan ind............ ISDN (Telephony)
        0....... CallingPN incomplete ind...... Complete
     31 ***B5*** Address signal................ 4712535130
 
     36 00110001 Optional parameter............ Propagation Delay Counter
     37 00000010 Length........................ 2 Dec
 
     -- Propagation Delay Counter
     38 ***b16** Propagation delay value....... 0 Dec
 
     40 00111101 Optional parameter............ Hop Counter
     41 00000001 Length........................ 1 Dec
 
     -- Hop Counter
     42 ...11111 Hop counter................... 31 Dec
        000..... Spare......................... 0
 
     43 00111001 Optional parameter............ Param Compatibility Info
     44 00000100 Length........................ 4 Dec
 
     -- Parameter Compatibility Information
     45 00110001 Upgraded parameter............ Propagation Delay Counter
 
     -- Instruction indicators
     46 .......0 Transit at intermediate....... Transit interpretation
        ......0. Release call Ind.............. Don't release call
        .....0.. Send notification Ind......... Don't send notification
        ....0... Discard message............... Don't discard message
        ...0.... Discard parameter............. Don't discard parameter
        .10..... Pass on not possible ind...... Discard parameter
        1....... Extension..................... Last octet
 
     47 00111101 Upgraded parameter............ Hop Counter
 
     -- Instruction indicators
     48 .......0 Transit at intermediate....... Transit interpretation
        ......0. Release call Ind.............. Don't release call
        .....0.. Send notification Ind......... Don't send notification
        ....0... Discard message............... Don't discard message
        ...0.... Discard parameter............. Don't discard parameter
        .10..... Pass on not possible ind...... Discard parameter
        1....... Extension..................... Last octet
 
     49 00000000 Optional parameter............ End Of Optional Parameters
</verbatim>

---++++ Фильтрация


---++++ Ссылки
   * [[http://www.itu.int/rec/T-REC/e][ ITU-T Recommendations]]
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Topic revision: r3 - 2008-06-09 - 19:34:35 - OxanaAkhremenko
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