Developing Solutions provides a set of reference guides to aid in your testing, including dictionaries for the major protocols utilized in 3GPP 3G, 4G, and 5G core networks. Each dictionary, prepared from standards specifications, contains a list of protocol applications or procedures, each of which contains a table of messages and message codes valid for that application or specification. Every message description contains a table of message components (AVPs, IEs or attributes) for that message.
Using the Dictionaries with dsTest
To aid configuration of test scenarios, the Dictionaries and dsTest Help are cross-referenced on a protocol basis to allow easy correlation between the schema element and the AVPs/IEs and messages that the schema element may affect. Each AVP/IE dictionary description table includes a “Value Source” column that has protocol specific information, including a link to the dsTest Help topic describing the schema element and its use in the AVP/IE.
Our SmartAVP/SmartIE feature, enhancing the use of the Dictionaries, can be used to insert, delete, or replace AVPs, Attributes, or Informational Elements (IEs) in messages. SmartAVP enables the definition of optional, proprietary or vendor-specific signaling or introduction of corrupt or invalid AVPs/IEs to facilitate negative testing. When used in conjunction with SmartEvents, SmartAVPs allows precise control of AVPs/IEs within any message exchange.
The description of each schema element in the dsTest Help documentation includes a list of protocol specific messages that are affected by the element. The message name(s) are each linked back to the Dictionary description of that message.
Diameter Conformance Testing
Besides being a general reference, the dsTest Diameter Dictionary allows you to define a set of message templates against which all messages should be validated. A dictionary may be defined as a base level which can be applied to all applications with dictionary validation enabled, or at the application level which would only be applied to a specific application. Application level dictionaries are translucent, in that if a message or an AVP is not found in the application dictionary, the base dictionary is also searched.
Received messages are checked against the dictionary to find a template for that message type with a matching number and type of AVPs. The values of AVPs may be defined to a specific value, a list of acceptable values, a range of values, and/or minimum and maximum size. This allows validation of specific scenarios by using multiple templates for messages of the same type, effectively providing conditional validation.
The Diameter Dictionary can be configured to verify functional compliance to all supported specifications. This capability is highly optimized to run under moderate load levels, which supports compliance validation under load conditions.
Contact Developing Solutions Support if you would like to see how to use the Dictionaries for conformance testing.