Developing Solutions has " .. released their complete Diameter Dictionary .. The dsTest dictionary capability allows users to define a set of message templates against which all messages are to 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 AVP from a message is not found, the base dictionary is also searched".
See "Developing Solutions® Announces Complete Diameter Dictionary" - here. The dictionary is accessible here.