Xilouris, G.G.XilourisTrouva, E.E.TrouvaLobillo, F.F.LobilloSoares, J.M.J.M.SoaresCarapinha, J.J.CarapinhaMcGrath, M.J.M.J.McGrathGardikis, G.G.GardikisPaglierani, P.P.PaglieraniPallis, E.E.PallisZuccaro, L.L.ZuccaroRebahi, Y.Y.RebahiKourtis, A.A.Kourtis2022-03-122022-03-122014https://publica.fraunhofer.de/handle/publica/38545110.1109/EuCNC.2014.6882687Network Functions Virtualization (NFV) is a concept, which has attracted significant attention as a promising approach towards the virtualization/""softwarisation"" of network infrastructures. With the aim of promoting NFV, this paper outlines an integrated architecture, designed and developed within the context of the EU FP7 T-NOVA project, which allows network operators not only to deploy virtualized Network Functions (NFs) for their own needs, but also to offer them to their customers, as value-added services (Network Functions as-a-Service, NFaaS). Virtual network appliances (gateways, proxies, firewalls, transcoders, analyzers etc.) can be provided on-demand as-a-Service, eliminating the need to acquire, install and maintain specialized hardware at customers' premises. A ""NFV Marketplace"" is also introduced, where network services and functions created by a variety of developers can be published, acquired and instantiated on-demand.en004conference paper