To overcome the limit of a point-point connection type service which is common to the ISDN bearer services, a new concept of network element, Service Node, which can provide multiparty connections and control the teleservices on those connections is proposed. This will support conference type multiparty multimedia services among normal ISDN subscribers. In this paper, as a primary study on this concept, we deduce some attributes of the general conference type services and examine the methods and procedures to provide that kind of services through the ISDN. Based on this study, we also define the general requirements and basic structure for the Service Node realization, thus give shape to the concept of it.