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- Recommendation Q.772
- TRANSACTION CAPABILITIES INFORMATION ELEMENT DEFINITIONS
- 1 General
- This Recommendation describes the individual information elements and
- parameters used within Transaction Capabilities messages. The encoding and
- formatting of these elements are shown in Recommendation Q.773.
- The meaning of each information element is described in general terms.
- For TC based upon a connectionless network service, the current TC is
- equivalent to the Transaction Capabilities Application Part (TCAP).
- The TCAP message format consists of two parts, namely the transaction
- portion and the component portion. Information in the component portion concerns
- individual operations and their replies. The transaction portion contains
- protocol control information for the transaction sub-layer.
- For a more detailed analysis of the architecture, see Figure 3/Q.771, and
- associated text.
- 2 Transaction portion
- The transaction portion of a TC message may contain the following
- information elements, viz:
- 2.1 Message type
- Five types of messages are defined for the transaction portion as follows:
- 2.1.1 Unidirectional
- This message is used when there is no need to establish a transaction with
- another peer TR-User.
- 2.1.2 Begin
- This message is used to initiate a transaction with another peer TR-User.
- 2.1.3 End
- This message is used to terminate a transaction with another peer TR-User.
- 2.1.4 Continue
- This message is used to complete the establishment of a transaction and to
- continue an established transaction.
- 2.1.5 Abort
- This message is used to terminate a transaction following an abnormal
- situation detected by the transaction sub-layer (the service provider), or to
- abort a transaction by the TR-User (the service user).
- 2.2 Transaction IDs
- Transaction IDs are independently assigned by each of the two nodes
- communicating via a transaction, enabling each node to uniquely identify the
- transaction and associate the entire contents of the message with that particular
- transaction. There are two types of Transaction IDs, viz:
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- Fascicle VI.9 - Rec. Q.722 PAGE33
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- 2.2.1 Originating Transaction ID
- The Originating Transaction ID is assigned by the node sending a message,
- and is used to identify the transaction at that end.
- 2.2.2 Destination Transaction ID
- The Destination Transaction ID identifies the transaction at the receiving
- end. The first Originating Transaction ID value received is reflected as the
- Destination Transaction ID value.
- 2.3 P-Abort Cause
- This is used when the transaction sub-layer aborts a transaction.
- P-Abort cause definitions are as follows:
- 2.3.1 Unrecognized Message Type
- The message type is not one of those defined in SS 2.1.1 to 2.1.5 above.
- 2.3.2 Unrecognized transaction ID
- A transaction ID has been received for which a transaction does not exist
- at the receiving node.
- 2.3.3 Badly formatted transaction portion
- The transaction portion of the received message does not conform to the
- X.209 encoding rules as outlined in Recommendation Q.773, S 3.
- 2.3.4 Incorrect transaction portion
- The elemental structure within the transaction portion of the received
- message, does not conform to the rules for the transaction portion defined in
- Recommendation Q.773 S 5.
- 2.3.5 Resource limitation
- Sufficient resources are not available.
- 2.4 User abort information
- This is used to pass User Specified Information by the TR-User when it
- aborts a transaction.
- 2.5 Component portion
- This contains the component portion. When the component portion is empty
- this information element is not present.
- 3 Component Portion
- The Component Portion contains the following types of information
- elements. They are delivered to the user at the receiving end in the same order
- in which they were received from the user at the originating end.
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- PAGE34 Fascicle VI.9 - Rec. Q.772
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- 3.1 Component type
- There are five types of component that may be present in the Component
- Portion of a TC message. The four Protocol Data Units (PDUs) defined
- inRecommendation X.229 are used, viz:
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- TCAP component X.229 PDU
- Invoke ROIV
- Return result (last) RORS
- Return error ROER
- Reject RORJ
- The remaining component type - Return Result (Not Last) - is defined by
- TCAP.
- These component types are defined as follows:
- 3.1.1 Invoke
- The invoke component requests that an operation be performed. It may be
- linked to another operation invocation previously sent by the other end.
- 3.1.2 Return result (Not Last)
- When TC uses a connectionless Network Service, it may be necessary for the
- TC-User to segment the result of an operation. In this case this component is
- used to convey each segment of the result except the last, which is conveyed in a
- Return Result (Last) component.
- 3.1.3 Return result (Last)
- The Return Result (Last) component reports successful completion of an
- operation. It may contain the last/only segment of a result.
- 3.1.4 Return error
- The Return Error component reports that an operation has not been
- successfully completed.
- 3.1.5 Reject
- The Reject component reports the receipt and rejection of an incorrect
- component, other than a Reject component. The possible causes for rejecting a
- component are defined by the Problem Code element in S 3.8.
- 3.2 Invoke ID
- An Invoke ID is used as a reference number to identify uniquely a request
- for an operation. It is present in any reply to an Invoke component (Return
- Result, Return Error or Reject), enabling the reply to be correlated with the
- invoke.
- 3.3 Linked ID
- A Linked ID is included in an invoke component by a node when it responds
- to an operation invocation with a linked operation invocation. The node receiving
- the Linked ID uses it for correlation purposes, in the same way that it uses the
- invoke ID in Return Result, Return Error and Reject components.
- 3.4 Operation code
- The Operation Code element indicates the precise operation to be invoked,
- and is present in an invoke component type. The operation may be a local
- operation or a global operation. A local operation can be used in one ASE only.
- The same global operation can be used in several different ASEs.
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- Fascicle VI.9 - Rec. Q.722 PAGE33
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- The actual operation codes, the definition of the operations and their
- associated parameters, are defined in relevant ASE specifications. The component
- sub-layer does not set or examine the operation code value, nor which parameters
- are present, nor the parameter values.
- 3.5 Set (of parameters)
- The Set element is used to contain a set of parameters accompanying a
- component. It is required in the case of more than one parameter being included
- in a component. The parameters themselves are defined in relevant ASE
- specifications.
- 3.6 Sequence (of parameters)
- The Sequence element is used similarly to the Set element, except that a
- specific sequence of parameters is included in the component.
- 3.7 Error code
- The Error Code element contains the reason why an operation cannot be
- completed successfully. It is present only in a Return Error component. As with
- operations, errors may be local or global.
- These errors and associated parameters are defined in relevant ASE
- specifications.
- 3.8 Problem code
- The Problem code element contains the reason for the rejection of a
- component, and one such element is present in a Reject component. Four problem
- code elements are defined, viz:
- 3.8.1 General problem
- This element contains one of the problem codes which apply to the
- component sub-layer in general, and which do not relate to any specific component
- type. All of these are generated by the component sub-layer. They are:
- 3.8.1.1 Unrecognized component
- The component type is not recognized as being one of those defined in S
- 3.1.
- 3.8.1.2 Mistyped component
- The elemental structure of a component does not conform to the structure
- of that component as defined in Recommendation Q.773 S 6.
- 3.8.1.3 Badly structured component
- The contents of the component do not conform to the encoding rules defined
- in Recommendation Q.773 S 3.
- 3.8.2 Invoke problem
- This element contains one of the problem codes which relate only to the
- invoke component type. They are:
- 3.8.2.1 Duplicate invoke ID
- The invoke ID is already in use by a previously invoked operation. This
- code is generated by the TC-User.
- 3.8.2.2 Unrecognized operation
- The operation code value is not one of those used by the ASE. This code is
- generated only by the TC-User.
- 3.8.2.3 Mistyped parameter
- A parameter tag is not one of those associated with the operation invoked.
- This code is generated only by the TC-User.
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- PAGE34 Fascicle VI.9 - Rec. Q.772
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- 3.8.2.4 Resource limitation
- Sufficient resources are not available to perform the operation requested.
- This code is generated by the TC-User.
- 3.8.2.5 Initiating release
- The operation requested cannot be invoked as the dialogue is about to be
- released. This code is generated only by the TC-User.
- 3.8.2.6 Unrecognized linked ID
- The linked ID does not correspond to a previously invoked operation. This
- code is generated only by the component sub-layer.
- 3.8.2.7 Linked response unexpected
- The operation referred to by the linked ID is not an operation for which
- linked invokes are allowed. This code is generated only by the TC-User.
- 3.8.2.8 Unexpected linked operation
- The linked operation is not one of those that the operation referred to by
- the linked ID allows. This code is generated only by the TC-User.
- 3.8.3 Return result problem
- This element contains one of the problem codes which relate only to the
- return result component type. They are:
- 3.8.3.1 Unrecognized invoke ID
- No operation with the specified invoke ID is in progress. This code is
- generated by the component sub-layer.
- 3.8.3.2 Return result unexpected
- The invoked operation does not report success. This code is generated by
- the component sub-layer.
- 3.8.3.3 Mistyped parameter
- A parameter tag is not one of those associated with the outcome of the
- operation. This code is generated only by the TC-User.
- 3.8.4 Return error problem
- This element contains one of the problem codes which relate only to the
- return error component type. They are:
- 3.8.4.1 Unrecognized invoke ID
- No operation with the specified invoke ID is in progress. This code is
- generated by the component sub-layer.
- 3.8.4.2 Return error unexpected
- The invoked operation does not report failure. This code is generated by
- the component sub-layer.
- 3.8.4.3 Unrecognized error
- The reported error is not one of those defined for the ASE. This code is
- generated by the TC-User.
- 3.8.4.4 Unexpected error
- The received error is not one of those which the invoked operation may
- report. This code is generated by the TC-User.
- 3.8.4.5 Mistyped parameter
- A parameter tag is not one of those associated with the outcome of the
- operation. This code is generated only by the TC-User.
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- Fascicle VI.9 - Rec. Q.722 PAGE33
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