Use the subexpression builder to build complex rule conditions from subexpressions by using AND, OR, NOT and parenthetical grouping. The rule builder validates the rule when you apply the changes, and alerts you to mismatched parentheses, and unsupported logic operators.
To view this administrative console page, click Servers > On demand routers > odr_name> SIP On demand router properties > Routing policy SIP rules > Add > Subexpression builder.
To modify rules with the rule builder, you must have administrator administrative privileges.