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In recent years, the Internet community has been working on extensions to the current Internet protocol suite in order to enable service guarantees or service differentiation, but the standardised solutions to integrate IP and ATM still are restricted to IP to ATM on a best-effort basis. This paper deals with a framework for QoS based interworking between IP and ATM. After a brief overview on the state of the art of IP and ATM networking, particular focus is put on the integration of the IP reservation protocols RSVP and SRP with ATM. Signalling and traffic control issues as well as application requirements related with two models, often referred to as overlay and peer models respectively, are discussed. Finally, an architecture for a prototype network architecture as planned by the ACTS DIANA project is presented which will allow to investigate several approaches for the QoS based integration of IP and ATM.