The SIS has certain default behaviours that it performs when handling messages received from a composition service. Message handling options can be used to alter the default behaviours for specific message types.

Message handling options are specified using the <message-handle-options> element within an or element.

How messaged handling options work

Below is an example of how you might use message handling options:

<invoke service="...">
    <message-handling-options>
        <message-handling-option .../>
        <message-handling-option .../>
        <message-handling-option .../>
    </message-handling-options>
</invoke>

Any number of valid message handling options can be specified for a service or parallel block. The base XML schema for message handling options defines the simplest option, the empty <message-failure-option> element. This option by itself has no effect on the SIS.

For IN, message handling options specify up to three attributes:

Attribute Name Required? Description 
 on-message

✔

A message type.

 
 action

✔

The action to perform if a message of the given type is encountered.

 
 is-failure

✘

Relevant only for message types that could be considered a service error or failure.

For certain actions, a <terminate> child element may also be included with the <message-handling-option> element. It specifies a terminate clause that the SIS will use to send a response for the current event.

Open Refuse

This option specifies the behaviour of the SIS when it receives an Open Refuse response from a service. The default behaviour, if this option is undeclared, is equivalent to:

<in:message-handling-option on-message="open-refuse" action="ignore-service-and-continue" is-failure="true"/>
Action Failure? Description and example 
 ignore-service-and-continue
 
 true

Initial request service failure handling behaviour is first invoked. For external services this may mean a standby external address is contacted. Assuming a local service, no standby, or the standby also refuses the dialog, service failure statistics are recorded, the service is removed from the composition, and composition evaluation continues for the initial request.

<in:message-handling-option
    on-message="open-refuse"
    action="ignore-service-and-continue"
    is-failure="true"/>
 
 false

No initial request service failure handling behaviour is invoked, and no service failure statistics are recorded. The service is simply removed from the composition, and composition evaluation continues for the initial request.

<in:message-handling-option
    on-message="open-refuse"
    action="ignore-service-and-continue"
    is-failure="false"/>
 
 terminate-processing
 
 true

Processing of the initial request is terminated and service failure statistics are recorded. If no terminate child element is specified then the SIS will send a response for the initial request to the network based on the services that have been successfully invoked thus far, otherwise the SIS will take the action indicated by the terminate element.

<in:message-handling-option
      on-message="open-refuse"
      action="terminate-processing"
      is-failure="true">
    <in:terminate record-as-reject="true">
      <in:release cause-code="21" dialog-termination="close"/>
    </in:terminate>
</in:message-handling-option>
 
 false

Processing of the initial request is terminated. No service failure statistics are recorded. If no terminate child element is specified then the SIS will send a response for the initial request to the network based on the services that have been successfully invoked thus far, otherwise the SIS will take the action indicated by the terminate element.

<in:message-handling-option
      on-message="open-refuse"
      action="terminate-processing"
      is-failure="false">
    <in:terminate record-as-reject="true">
      <in:release cause-code="21" dialog-termination="close"/>
    </in:terminate>
</in:message-handling-option>

User Abort

This option specifies the behaviour of the SIS when it receives a User Abort from a service. The default behaviour, if this option is undeclared, is equivalent to:

<in:message-handling-option on-message="user-abort" action="propagate" is-failure="true"/>
Warning If a service receives an Open Request and responds with a User Abort on that dialog before sending any Delimiter, that User Abort will be handled according to the behaviour defined for Open Refuse.
Action Failure? Description and example 
 ignore-service-and-continue
 
 true

Service failure handling behaviour is first invoked. For external services this may mean a standby external address is contacted if the initial request is still being processed. Assuming a local service, no standby, the standby also aborts the dialog, or the standby cannot be invoked given the current call state, service failure statistics are recorded, the service is removed from the composition, and processing of any current event continues.

<in:message-handling-option
    on-message="user-abort"
    action="ignore-service-and-continue"
    is-failure="true"/>
 
 false

No service failure handling behaviour is invoked, and no service failure statistics are recorded. The service is simply removed from the composition, and processing of any current event continues.

<in:message-handling-option
    on-message="user-abort"
    action="ignore-service-and-continue"
    is-failure="false"/>
 
 terminate-processing
 
 true

Processing of any current event is terminated and service failure statistics are recorded. If no terminate child element is specified then, if relevant, the SIS will send a response for the current event to the network based on event processing thus far, otherwise the SIS will take the action indicated by the terminate element.

<in:message-handling-option
      on-message="user-abort"
      action="terminate-processing"
      is-failure="true">
    <in:terminate record-as-reject="true">
      <in:release cause-code="41" dialog-termination="close"/>
    </in:terminate>
</in:message-handling-option>
 
 false

Processing of any current event is terminated. No service failure statistics are recorded. If no terminate child element is specified then, if relevant, the SIS will send a response for the current event to the network based on event processing thus far, otherwise the SIS will take the action indicated by the terminate element.

<in:message-handling-option
      on-message="user-abort"
      action="terminate-processing"
      is-failure="false">
    <in:terminate record-as-reject="true">
      <in:release cause-code="41" dialog-termination="close"/>
    </in:terminate>
</in:message-handling-option>
 
 propagate
 
 true

The user abort is propagated towards the network dialog. Handling of the user abort moves to the next outer level in the SIS; for example, a user abort propagated from an <invoke> within a <parallel> block moves the handling of that abort to the parallel block. If already at the outermost level, the user abort is sent on the network dialog itself. Processing of any current event is terminated and service failure statistics are recorded. Composition services at the same level as the service sending the user abort will be terminated with a user abort.

<in:message-handling-option
    on-message="user-abort"
    action="propagate"
    is-failure="true"/>
</in:message-handling-option>
 
 false

The user abort is propagated towards the network dialog. Handling of the user abort moves to the next outer level in the SIS; for example, a user abort propagated from an <invoke> within a <parallel> block moves the handling of that abort to the parallel block. If already at the outermost level, the user abort is sent on the network dialog itself. Processing of any current event is terminated. No service failure statistics are recorded. Composition services at the same level as the service sending the user abort will be terminated with a user abort.

<in:message-handling-option
    on-message="user-abort"
    action="propagate"
    is-failure="false"/>
</in:message-handling-option>

Interrupted Event Error

This option specifies the behaviour of the SIS when it receives a User Error response from a service for an event delivered to the service in Interrupted mode — that is, an event such as the initial request, that suspends further call state processing until the service provides a suitable response. The default behaviour, if this option is undeclared, is equivalent to:

<in:message-handling-option on-message="interrupted-event-error" action="propagate" is-failure="true"/>
Action Failure? Description and Example 
 ignore-service-and-continue
 
 true

Service failure handling behaviour is first invoked. For external services this may mean a standby external address is contacted if the initial request is still being processed. Assuming a local service, no standby, the standby also aborts the dialog, or the standby cannot be invoked given the current call state, service failure statistics are recorded, the service is removed from the composition, and processing of any current event continues.

<in:message-handling-option
    on-message="interrupted-event-error"
    action="ignore-service-and-continue"
    is-failure="true"/>
 
 false

No service failure handling behaviour is invoked, and no service failure statistics are recorded. The service is simply removed from the composition, and processing of any current event continues.

<in:message-handling-option
    on-message="interrupted-event-error"
    action="ignore-service-and-continue"
    is-failure="false"/>
 
 terminate-processing
 
 true

Processing of any current event is terminated and service failure statistics are recorded. If no terminate child element is specified then the SIS will send a response for the current event to the network based on event processing thus far, otherwise the SIS will take the action indicated by the terminate element.

<in:message-handling-option
      on-message="interrupted-event-error"
      action="terminate-processing"
      is-failure="true">
    <in:terminate record-as-reject="true">
      <in:release cause-code="41" dialog-termination="close"/>
    </in:terminate>
</in:message-handling-option>
 
 false

Processing of any current event is terminated. No service failure statistics are recorded. If no terminate child element is specified then the SIS will send a response for the current event to the network based on event processing thus far, otherwise the SIS will take the action indicated by the terminate element.

<in:message-handling-option
      on-message="interrupted-event-error"
      action="terminate-processing"
      is-failure="false">
    <in:terminate record-as-reject="true">
      <in:release cause-code="41" dialog-termination="close"/>
    </in:terminate>
</in:message-handling-option>
 
 propagate
 
 true

The user error is propagated towards the network dialog. Handling of the user error moves to the next outer level in the SIS; for example, a user error propagated from an <invoke> within a <parallel> block moves the handling of that error to the parallel block. If already at the outermost level, the user error is sent on the network dialog itself and the dialog is closed. Processing of any current event is terminated and service failure statistics are recorded. Composition services at the same level as the service sending the user error will be terminated.

<in:message-handling-option
    on-message="interrupted-event-error"
    action="propagate"
    is-failure="true"/>
</in:message-handling-option>
 
 false

The user error is propagated towards the network dialog. Handling of the user error moves to the next outer level in the SIS; for example, a user error propagated from an <invoke> within a <parallel> block moves the handling of that error to the parallel block. If already at the outermost level, the user error is sent on the network dialog itself and the dialog is closed. Processing of any current event is terminated. No service failure statistics are recorded. Composition services at the same level as the service sending the user error will be terminated.

<in:message-handling-option
    on-message="interrupted-event-error"
    action="propagate"
    is-failure="false"/>
</in:message-handling-option>

O-Trigger Connect

This option specifies the behaviour of the SIS when it receives a valid Connect response from a service while executing the originating call state model for the call. The default behaviour, if this option is undeclared, is equivalent to:

<in:message-handling-option on-message="o-trigger-connect" action="continue"/>

The is-failure attribute cannot be specified for this option.

Action Description and example 
 continue

The Connect updates any appropriate parameters of the event it is a response to, and processing of that event continues to the next service in the composition.

<in:message-handling-option
    on-message="o-trigger-connect"
    action="continue"/>
 
 propagate

The Connect is propagated towards the network dialog. Processing of any current event is terminated and no more services will be invoked at the current level in the SIS.

<in:message-handling-option
    on-message="o-trigger-connect"
    action="propagate"/>
 
 propagate-on-destination-change

This option provides a conditional response depending on the content of the Connect operation sent by the service. If the Connect received by the SIS contains a Destination Routing Address parameter with an address string that is the same as the address string contained in the Called Party Number that was included in the initial request delivered to the service, this option will behave the same as the continue option. Otherwise, it will behave the same as the propagate option.

<in:message-handling-option
    on-message="o-trigger-connect"
    action="propagate-on-destination-change"/>
 
 rebranch

If processing the initial request, this option behaves the same as the continue option. Otherwise it will cause the composition script to be re-evaluated again from the current service, possibly causing later services in the composition to be retriggered. The SIS will use the original initial request delivered to the current service, modify it with relevant parameters from the Connect as normal, and use the resulting initial request as the input for the composition re-evaluation. See the section on rebranching for more information.

<in:message-handling-option
    on-message="o-trigger-connect"
    action="rebranch"/>

T-Trigger Connect

This option specifies the behaviour of the SIS when it receives a valid Connect response from a service while executing the terminating call state model for the call. The default behaviour, if this option is undeclared, is equivalent to:

<in:message-handling-option on-message="t-trigger-connect" action="propagate-on-destination-change"/>

The is-failure attribute cannot be specified for this option.

The actions that can be specified for this option are identical in name and behaviour to those defined for o-trigger-connect option.

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