Adding a SIP Condition Group

A SIP Condition is used to test specific parts of SIP headers fields from the incoming Get-Route request message, with specified values. The routing flow of the call will be dependent on the outcome of the SIP Condition.

Network administrators can add a SIP Condition Group. A SIP Condition Group can comprise one condition or multiple conditions. If there are conditions rules in a group, they're performed in the order they're listed. Each condition has an operator (‘AND’ or ‘OR’) for logical operating with the next condition.

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To add a SIP Condition Group:

1.

Open the SIP Condition Groups page (Settings > Call Flow Configurations > SIP Condition Groups).

2.

Click the Add + icon.

3.

Use the following table as reference:

Parameter	Description
Name	Enter an intuitive SIP Condition Group name.
Subject	Define the message component to compare with. You can use the built-in syntax editor to help you configure the field. See also SIP Condition Syntax for information about the syntax to use.
Operator	The comparing type such as equals, exists, etc. ■ Equal - Returns 'true' if the subject equals the value. ■ Doesn’t equal - Returns 'true' if the subject does not equal the value. ■ >= - Performs a character-by-character compare. Returns 'true' if the ASCII value of the subject is greater than or equal to that in the value. ■ <= - Performs a character-by-character compare. Returns 'true' if the ASCII value of the subject is less than or equal to that in the value. ■ > - Performs a character-by-character compare. Returns 'true' if the ASCII value of the subject is greater than that in the value. ■ < - Performs a character-by-character compare. Returns 'true' if the ASCII value of the subject is less than that in the value. ■ Contains - Returns 'true' if the value is found in the subject. ■ Doesn’t contain - Returns 'true' if the value is not found in the subject. ■ Suffix - Returns 'true' if the subject has Value as suffix. ■ Prefix - Returns 'true' if the subject has Value as prefix. ■ Len greater Than - Returns 'true' if subject length is greater than the value (a number). ■ Len Less Than - Returns 'true' if the subject length is less than the value (a number). ■ Len equal to - Returns 'true' if the subject length is equal to the value (a number). ■ Regex - Returns 'true' if the subject matches the given regular expression. ■ Exists - Returns 'true' if the subject exists. ■ Doesn’t exist - Returns 'true' if the subject doesn’t exist. ■ Prefix Group - Returns 'true' if the subject belongs to a specific prefix group (only for users).
Values	The strings to be compared with the subject. Each string value must be enclosed by a single quotation mark ('...'). To concatenate values, use the plus “+” operator. The condition is 'true' if the subject meets at least one of the values. Use the built-in syntax editor to help you configure the field. See also SIP Condition Syntax.
Description	Enter a brief description of the SIP Condition Group.

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To add a SIP Condition to a SIP Condition Group:

1.

Click the Add + icon.

2.

Define the previous SIP Condition's field ‘Operator with next line’ as shown in the next figure.

If there are more than two SIP Conditions, the logical Expression is evaluated from left to right. For example:

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"A AND B OR C" is calculated as (A AND B) OR C.

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"A OR B AND C" is calculated as (A OR B) AND C.

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“A OR B AND C OR D” is calculated as ((A OR B) AND C) OR D.

3.

Define the fields of the new SIP Condition according to the parameter descriptions in the previous table.