In the left navigation pane, go to SIP > Message Manipulation > Message Rule Table.
SIP Message Rule Table
To create a request line rule entry to a table:
In the left navigation pane, click the Rule Table entry to which you want to add a Request Line Rule.
Rule Table 1
From the Create Rule drop down box, select Request Line Rule.
Create SIP Request Line Rule
This logical expression is evaluated in order to determine whether the rule should be applied or not. An empty expression is evaluated as unconditionally true.
Example Rule:
${1} && (${2} || ${3})
Click the Add/Edit button to launch the Condition Expression Builder. The Condition Expression Builder enables you to create logical expressions using an interactive interface.
Specifies whether or not the rule is enabled.
Specifies the whether the true evaluation of the expression is optional or mandatory. Optional means subsequent rules are applied if this rule fails, mandatory means subsequent rules are not applied if this rule fails.
The Request Line Value holds a value that is provided by the SIP REQUEST. The request can be opened to updates it components in the sub-panels.