The standardization of the Internet multimedia subsystem (IMS) renewed the architecture of management of the advanced telecommunication services. Nevertheless the IMS also introduces new interrogations, in particular concerning the management of Quality of service (QoS) considering the services multi-media calling upon of technologies so much advanced (UMTS) that existing (POTS, GSM). In this context, this article proposes to study as well from a theoretical point of view as practical an architecture of management of QoS in a transparent way and from beginning to end in a network IMS