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A criteria identifies which conditions to meet before a modification specified in an action part is executed. Different criteria elements and their use cases include:

  • Message Criteria Element—Specifies whether the rule applies for requests/responses/both, method name and if response code/response code range is applicable. This criteria element must be present in all types of rules.
  • Header Criteria Element—Specifies for which header the rule is applicable. This criteria element must be present in Request Line, Header, Parameter and Token rules.
  • Parameter Criteria Element—Specifies for which parameter the rule is applicable. This criteria element must be present in Parameter rules.
  • Token Criteria Element—Specifies for which token the rule is applicable. This criteria element must be present in Token rules.
  • Variable Criteria Element—Specifies for which value of an internal variable the rule is applicable. This criteria element must be present in Variable rules.
  • Global Variable Criteria Element—Specifies for which value of the global variable the rule is applicable. This criteria must be present in the global variable rules.
  • Message Body Criteria Element—Specifies for which message body the rule is applicable. This criteria must be present in the message body rules.

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Different SIP elements are used while identifying the criteria, as described below.

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Message Criteria


The Message criteria optionally specifies a SIP request or response for a particular method or response (status) code, as follows:

  • All messages
  • All requests
  • Requests for a specified SIP method
  • All responses
  • All responses for a specified SIP method
  • Responses with a specified status code
  • Responses with a specified status code for a specific SIP method
  • Responses with a specified status code range
  • Responses with a specified status code range for a specific SIP method

SIP Header Criteria

The Header criteria specify the presence, absence, or value of a specific SIP Header as follows:

  • Presence of a specified SIP header/Request-URI
  • Absence of a specified SIP header/Request-URI
  • Specified SIP header contains a specified value
  • Specified SIP header does not contain a specified value
  • Value of specified SIP header matches a specified regular expression
  • Value of specified SIP header does not match a specified regular expression

Per RFC 3261 section 7, the Field Value is defined per header-name. As either an opaque sequence of TEXT-UTF8 octets, or a combination of white space, tokens, separators, and quoted strings. Many existing header fields adhere to the general form of a value followed by a semicolon (;) separated sequence of parameter-name, parameter-value pairs, as shown below:  

field-name: field-value *(;parameter-name=parameter-value)

In the following example, "terminated" is a field value: 

Subscription-State: terminated; reason=rejected

A set of criteria must always include a single SIP Header instance that specifies the SIP Header/Request-URI to be used for the indicated action.

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When multiple instances of the same header are present in a message, headers are examined in the order presented. This action applies to the Header Instances (or range of instances) which match the Header Criterion specified in the rule.

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SIP Parameter Criteria

SIP parameter criteria specify the presence, absence, or value of a specific SIP Parameter as follows:

  • Presence of a specified SIP parameter
  • Absence of a specified SIP parameter
  • SIP parameter has a specified value
  • SIP parameter does not have a specified value
  • Value of a SIP parameter matches a specified regular expression
  • Value of a SIP parameter does not match a specified regular expression

If a criterion contains a SIP parameter component, it is evaluated together with the SIP header component. For example, if the SIP header component = presence of P-CALLED-PARTY-ID, and the SIP parameter component = absence of OPERATOR parameter, the rule matches if P-CALLED-PARTY-ID is present and no operator parameter is present in the P-CALLED-PARTY-ID.

Three different types of parameters may be specified as detailed in the table below. The parameter type allows the criterion to locate the position of specified parameter.

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SIP Parameter TypeDescriptionExample
GenericGeneric parameters are added to headers after the field value.

In the following example, "reason" is a generic parameter with value of "rejected":

Subscription-State: terminated; reason=rejected

URI

URI Parameters follow addresses in different URI schemes. They are distinguished from generic parameters by being present before the greater-than (>) symbol in a URI value.

In following example, "lr" is a URI parameter:

Route: <sip: proxy@example.com; lr>

User

User Parameters are embedded in SIP/SIPS URI schemes and are present in the userpart, i.e. they are positioned before the @ and are separated from the actual userpart value by a semi-colon (;).

In following example, "phone-context" is a user parameter with a value = 5, and "user" is a URI parameter with a value of "phone":

INVITE sip: +125-323-1234567; phone-context=5@foo.com; user=phone SIP/2.0


ISUP Parameter Criteria

ISUP parameter criteria specify the presence, absence, or value of a specific ISUP parameter as follows:

  • Presence of a specified ISUP parameter
  • Absence of a specified ISUP parameter
  • ISUP parameter has a specified value
  • ISUP parameter does not have a specified value
  • Value of a ISUP parameter matches a specified regular expression
  • Value of a ISUP parameter does not match a specified regular expression


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Refer to SIP-I Support for additional parameter details.

Token Criteria

Token criteria specify the following:

  • Presence of a token
  • Absence of a token
  • A SIP token has a specified value
  • A SIP token does not have a specified value
  • Value of a SIP token matches a specified regular expression
  • Value of a SIP token does not match a specified regular expression

Tokens displayname, username, hostname, scheme and hostport are available to define a token criterion. A criterion may or may not have a token component. If token component is present, it must be evaluated together with the SIP header component or with SIP header/SIP parameter components.

Internal Variable Criteria

The Internal Variable criteria specify the following:

  • Presence of a specified internal variable
  • Absence of a specified internal variable
  • Internal variable has a specified value
  • Internal variable does not have a specified value
  • Value of an internal variable matches a specified regular expression
  • Value of an internal variable does not match a specified regular expression

Internal variables temporarily store values of SIP elements in a message. Internal variables have predefined names in the range VAR1, VAR2,... VAR30. An internal variable with a specified value can also be a criteria. A defined internal variable is available to all rules in a SIP Adaptor Profile when a message is being modified.

A value specified for a criteria component can be a static value, e.g. phonecompany.com, or an internal variable, e.g. VAR6. If an internal variable is given, its value is used.

Global Variable Criteria

The Global Variable criteria specify the following:

  • Presence of a specified global variable
  • Absence of a specified global variable
  • Global variable has a specified value
  • Global variable does not have a specified value
  • Value of a global variable matches a specified regular expression
  • Value of a global variable does not match a specified regular expression

Global variables are another type of internal variable. Currently seven global variables are supported: srcipaddr, srcport, sigportID, localIP, localPort, ingressTgName and egressTgName. A global variable with a specified value can also be a criteria. Global variables always exist; unlike internal variables, it is not necessary to create them. Plus, a global variable is always read-only, and its value is set when applying the rules in the SIP Adaptor Profiles.

Note
 Do not use egressTgName or ingressTgName in a SMM profile defined at the Zone level. Also, egressTgName and ingressTgName can only be used in an outputAdaptor profile.

Message Body Criteria

The Message Body criteria specify the following:

  • Presence of a specified content type
  • Absence of a specified content type
  • Value of a message body matches a specified regular expression
  • Value of a message body does not match a specified regular expression

A criterion may or may not have a message body component. If a criterion contains a message body component matching the message body of a SIP Message, the SIP Message is manipulated as specified in message body rules.

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