To open a interceptor diagram, double-click on the interceptor’s icon in the SISView interceptor list.

Below is an example of a freshly created interceptor diagram, plus details on the variable manipulators, condition (branching), and halt elements.

The control flow:

  • starts at the interceptor start element. From here you connect to other elements (Condition, Assign, Delete and so on) using the connect link from the palette. The connect link defines a next statement relation. You use it to specify the sequence of script statements in the interceptor.

  • ends at the interceptor end element.

Interceptor diagram

Below is an example of a freshly created interceptor. It includes a start node (top) and an end node (bottom).

FreshInterceptor

Variable manipulator elements (assign, delete)

Through the assign element, a variable can be set to:

  • a specific value

  • the value of any other existing variable

  • a complex variable type (such as a CalledPartyNumber)

  • the result of a string-manipulation function (such as a substring or string-length).

Through the the delete element, an existing variable can be "unset".

AssignAndDelete

Condition (branching) element

The Condition element represents a conditional selection within the composition’s flow chart logic. It has two outgoing connections:

  • <true> — followed if the condition evaluates to true (created using the if-true link from the palette)

  • <false> — followed if the condition evaluates to false (created using the if-false link from the palette).

If
Note A Condition statement must always have both, a <true> and <false> connection.
Tip To edit a Condition, double-click anywhere on the icon (which contains the condition’s textual representation at its centre). The Condition Editor opens in a new Editor tab.

Halt element

Halt elements allow you to stop the interceptor at any point during the script run. After encountering a halt, the SIS will evaluate no more interceptors instructions, and proceed to the interceptor end.

For SIP, a halt element can be configured with a failure response, indicating what shall be sent to the network.

Halt
Note Halt elements cannot have an outgoing connection to another diagram element, as they represent terminals of the invocation chain.
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