Recent advances in home network technology, combined with IP-based home appliances such as IPTV, can provide high-quality IP-based video conferencing service at relatively low cost. This paper presents SIP-based management architecture for large-scale home conferencing service using IPTV. In the proposed architecture, we extended the protocol stack of IPTV for the support of SIP-based signaling, and applied IPTV to large-scale home conferencing. High scalability of the proposed architecture is achieved by coordinated distributed conference control and media processing. The signaling procedures for the integrated control of IPTV have been designed in detail for SIP-based conferencing service. The performance of the proposed system has been evaluated by simulation. The simulation results show that the proposed architecture greatly improves scalability 1 .

Recent advances in broadband communication and computing technology have accelerated the proliferation of Internet protocol-based multimedia conferencing services in large-scale enterprises. Most of the research on session initial protocol (SIP)-based multimedia conferencing, however, has been limited in scalability due to the centralized management of conference control by a single server. In order to overcome this limitation, we have designed policy-based distributed management architecture for a large-scale enterprise conferencing service by extending the Internet Engineering Task Force's (IETF's) approach. The salient feature of the proposed management architecture is that in addition to the distribution of media processing, both participant membership control and authorization functions are dynamically distributed in accordance with the management policy in order to improve scalability. In order to implement these distributed management functions, we have extended both SIP and conference policy control protocols of the IETF. We also show the procedures for the distributed conference management using the extended SIP signaling methods. Finally, we have evaluated by simulation the performances of the proposed architecture in comparison with the centralized architecture of the IETF. The simulation results show that the proposed architecture greatly improves scalability.

In this paper, we design and implement a generic transaction capabilities (TC)/common object request broker architecture (CORBA) gateway necessary to provide inter-operability between CORBA-based control systems and legacy control systems using TC-based control protocols, such as an intelligent network application part protocol (INAP) and a mobile application part protocol (MAP). In addition, we introduce an object pool mechanism (OPM) to maintain control application objects in the CORBA domain and evaluate the performance of OPM. As a result, the object access time in a TC/CORBA gateway is reduced.

There have been growing research interests for the realization of a CORBA-based network management system for a telecommunication network, and several methods have been devised to apply CORBA technology to telecommunication management network. We consider a pure CORBA-based network management system. In this system, there is no conventional CMIP agent in a managed system. Otherwise, a managed system contains CORBA-based managed objects with which CORBA-based managing objects interact and perform the management task. To represent the containment relationship between CORBA-based managed objects in a managed system, a naming tree is used. To form the tree, a CORBA naming service is utilized. However, OMG's CORBA naming service requires the entire CORBA-based management objects to be instantiated at all times. Since the network elements usually do not have sufficient system resources, the applications running on them may experience severe degradation in performance. We design a new CORBA naming service. By modifying the OMG's naming service and adding an IDL definition for the new naming service, one can efficiently construct a naming tree without instantiating all the managed objects all at once. CORBA IDL is defined for the new naming service, and performance of the implementation is evaluated to demonstrate its efficiency.

This paper presents a policy-based hybrid management architecture for IP-based VPN (virtual private network) service that makes use of a centralized global policy management server.