DialoguePDUs {itu-t recommendation q 773 modules(2) dialoguePDUs(2) version1(1)
  } DEFINITIONS ::=
BEGIN

EXPORTS dialogue-as-id, DialoguePDU;

-- abstract syntax name for structured dialogue APDUs
dialogue-as-id OBJECT IDENTIFIER ::=
  {itu-t recommendation q 773 as(1) dialogue-as(1) version1(1)}

DialoguePDU ::= CHOICE {
  dialogueRequest   AARQ-apdu,
  dialogueResponse  AARE-apdu,
  dialogueAbort     ABRT-apdu
}

AARQ-apdu ::= [APPLICATION 0] IMPLICIT SEQUENCE {
  protocol-version
    [0] IMPLICIT BIT STRING {version1(0)} DEFAULT {version1},
  application-context-name  [1]  OBJECT IDENTIFIER,
  user-information          [30] IMPLICIT SEQUENCE OF EXTERNAL OPTIONAL
}

AARE-apdu ::= [APPLICATION 1] IMPLICIT SEQUENCE {
  protocol-version
    [0] IMPLICIT BIT STRING {version1(0)} DEFAULT {version1},
  application-context-name  [1]  OBJECT IDENTIFIER,
  result                    [2]  Associate-result,
  result-source-diagnostic  [3]  Associate-source-diagnostic,
  user-information          [30] IMPLICIT SEQUENCE OF EXTERNAL OPTIONAL
}

-- RLRQ PDU is currently not used.
-- It is included for completeness only.
RLRQ-apdu ::= [APPLICATION 2] IMPLICIT SEQUENCE {
  reason            [0] IMPLICIT Release-request-reason OPTIONAL,
  user-information  [30] IMPLICIT SEQUENCE OF EXTERNAL OPTIONAL
}

-- RLRE PDU is currently not used.
-- It is included for completeness only
RLRE-apdu ::= [APPLICATION 3] IMPLICIT SEQUENCE {
  reason            [0] IMPLICIT Release-response-reason OPTIONAL,
  user-information  [30] IMPLICIT SEQUENCE OF EXTERNAL OPTIONAL
}

ABRT-apdu ::= [APPLICATION 4] IMPLICIT SEQUENCE {
  abort-source      [0] IMPLICIT ABRT-source,
  user-information  [30] IMPLICIT SEQUENCE OF EXTERNAL OPTIONAL
}

ABRT-source ::= INTEGER {dialogue-service-user(0), dialogue-service-provider(1)
}

Associate-result ::= INTEGER {accepted(0), reject-permanent(1)}

Associate-source-diagnostic ::= CHOICE {
  dialogue-service-user
    [1]  INTEGER {null(0), no-reason-given(1),
                  application-context-name-not-supported(2)},
  dialogue-service-provider
    [2]  INTEGER {null(0), no-reason-given(1), no-common-dialogue-portion(2)}
}

-- Release-request-reason is currently not used.
-- It is included for completeness only.
Release-request-reason ::= INTEGER {normal(0), urgent(1), user-defined(30)
}

-- Release-response-reason is currently not used. 
-- It is included for completeness only.
Release-response-reason ::= INTEGER {
  normal(0), not-finished(1), user-defined(30)}

END -- DialoguePDUs