This paper proposes a resource reservation protocol to provide real-time services to mobile users. It is designed to support an integrated services network that maps the MPLS fields into IPv6's in order to simplify the protocol stack. The IPv6 Flow Label field is used to carry the MPLS label but its original value is restored at the egress node in order to keep this mechanism transparent from the user's point of view. Preliminary results show that the delays incurred to perform basic operations are low compared to an end-to-end reservation protocol. At last, limiting resource reservations to the access networks improves the scalability of the solution by reducing the number of managed states in the core routers.