Recommendation ITU-T F.746.11 describes interfaces for the intelligent question answering service framework (Recommendation ITU-T F.746.3). This Recommendation also defines the interfaces among functional modules to support the intelligent question answering service, which provides advanced functions to generate answers for the user's question in a natural language. The scope of this Recommendation is focused on describing interfaces and functional features for natural language processing function, question analysis function, candidate answer generation function, and answer inference/generation function of intelligent question answering system.