This paper describes a demonstrator of an IP-based access network for broadband multimedia services, which was designed to be low cost and easily manageable. In order to support broadband multimedia services, the network architecture incorporates a number of newly introduced technologies: SIP (Session Initiation Protocol) for session initiation, RSVP (resource ReSerVation Protocol) for resource reservation, and COPS (Common Open Police Service) for QoS policy management and AAA (Authentication, Authorization and Accounting). Some modules of the access network elements were implemented using the VOCAL (Vovida Open Communication Application Library) system, developed by Vovida. We report both functional and performance results obtained with the demonstrator, and traffic management experiments related with the policing, packet scheduling, resource reservation and admission control mechanisms.