Growing demands for the public wireless broadband services will require more capacity than the one provided by IP-based service providers (ISPs). The increasing popularity of WLANs due to the use of license-free radio spectrum with low-cost, easily deployable, high-data-rate wireless services, has encouraged service providers to consider their deployment in high density usage areas such us public hotspots to provide complementary broadband access to their networks and services. In order to provide consistent QoS control for multimedia applications (VoIP, VoD,...) over hotspots, a Session Initiation Protocol (SIP) based QoS management architecture is proposed in this article. Performance evaluations are discussed to illustrate the feasibility of the proposed architecture.