H4501-Supplementary-ServiceAPDU-Structure {itu-t recommendation h 450 
  1 version2(1) h4501-facility-information-structure(2)} DEFINITIONS AUTOMATIC
TAGS ::=
BEGIN

IMPORTS
  AliasAddress
    FROM H323-MESSAGES {itu-t(0) recommendation(0) h(8) h225-0(2250) 
      version(0) 7 h323-messages(0)} -- see H.225.0 V7
  OPERATION, ROS{}, InvokeId
    FROM Remote-Operations-Apdus {itu-t recommendation h 450 1 version2(1)
      remote-operations-apdus(11)};

H4501SupplementaryService ::= SEQUENCE {
  networkFacilityExtension  NetworkFacilityExtension OPTIONAL, -- see 8.1
  interpretationApdu        InterpretationApdu OPTIONAL, -- see 8.2
  serviceApdu               ServiceApdus, -- H.450.x supplementary services
  ...
}

NetworkFacilityExtension ::= SEQUENCE {
  sourceEntity              EntityType,
  sourceEntityAddress       AddressInformation OPTIONAL,
  destinationEntity         EntityType,
  destinationEntityAddress  AddressInformation OPTIONAL,
  ...
}

EntityType ::= CHOICE {endpoint   NULL,
                       anyEntity  NULL,
                       ...
}

AddressInformation ::= AliasAddress

InterpretationApdu ::= CHOICE {
  discardAnyUnrecognizedInvokePdu       NULL,
  clearCallIfAnyInvokePduNotRecognized  NULL,
  -- this value also applies to Call independent signalling connections 
  rejectAnyUnrecognizedInvokePdu        NULL,
  -- this coding is implied by the absence of an interpretation APDU.
  ...
}

ServiceApdus ::= CHOICE {
  rosApdus
    SEQUENCE SIZE (1..MAX) OF
      ROS{{InvokeIdSet}, {OperationSet}, {OperationSet}},
  -- see 8.3; other alternatives may be defined in future versions
  ...
}

InvokeIdSet INTEGER ::= {InvokeIDs, ...}

InvokeIDs ::= INTEGER(0..65535)

OperationSet OPERATION ::=
  {...}

-- actual values are defined by individual supplementary service specifications 
-- (e.g., H.450.x or manufacturer specific)
END -- of H4501- Supplementary-ServiceAPDU-Structure