The signalling in IP networks, particularly signalling the quality of service (QoS), has been a hot topic for many years and a lot of work has been done on end- to-end QoS signalling. The most important work remains the Resource ReServation Protocol (RSVP), developed by the Internet Engineering Task Force (IETF). RSVP, however, suffers from scalability problem in core networks. Other protocols face inter-working difficulties among domains in which different QoS solutions are deployed. Given the above, a new IETF work group (WG) termed Next Steps in Signalling (NSIS) WG was launched and is supposed to work on the requirements, architecture and protocols signalling purposes in future Internet generation. In this paper, we study some existing protocols and their infrastructures and how they can interoperate with a simplified solution for signalling in IP networks. We also propose an architecture upon which these protocols are to function.