A system and method supporting user registration, authentication and access to multimedia services via a broadband access gateway is disclosed. A representative embodiment of the present invention may comprise a wireless interface and may be capable of exchanging multimedia communication between the wireless interface and a broadband network. The gateway may determine access to available media-related services based upon information that is provisioned in a broadband access gateway prior to the first access by a user of an access device. The gateway may automatically allow access to access devices that are pre-registered, and may support opportunistic registration for those users of access devices that have not been pre-registered. Restricted access to services and networks available through the gateway may be provided even when registration is not successful, or when the access device is not pre-registered. Interactive registration for gateway access may be supported, and one-button access using either soft or hard buttons may be provided.