The new trends in the service area cause a change on the service provisioning architecture and scheme. The most obvious differences are multimedia services and multiparty communications. The existing service providing schemes can hardly catch up with these new trends. A few years ago, multimedia service was not applicable to the public networks, because of the shortage of transmission bandwidth. Nowadays, situations in the transmission capabilities of the public networks have been continuously changed. Moreover, developing ATM technology is the most powerful driving force towards a B-ISDN era. The essential components that constitute the traditional schemes have been defined in the characteristic categories of transmission, terminal and switching. In this paper, we define an additional component for the new B-ISDN services on public networks. We proposed a service provisioning architecture to be implemented on an ATM-based switching system as a uniform service management function called Service Node System (SNS) for enterprise networks. The SNS will provide a high degree of efficiency for providing a variety of new services on ATM-based telecommunication networks. We define various functions of the architecture and describe interaction schemes among its function modules.