Internet telephony: architecture and protocols—an IETF perspective
Computer Networks: The International Journal of Computer and Telecommunications Networking - Special issue on Internet telephony
A Voice over IP Service Architecture for Integrated Communications
IEEE Internet Computing
From POTS to PANS: A Commentary on the Evolution to Internet Telephony
IEEE Internet Computing
Internet telephony: services, technical challenges, and products
IEEE Communications Magazine
ITU-T standardization of audiovisual communication systems in ATM and LAN environments
IEEE Journal on Selected Areas in Communications
TOPS: an architecture for telephony over packet networks
IEEE Journal on Selected Areas in Communications
An architecture for residential Internet telephony service
IEEE Network: The Magazine of Global Internetworking
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Internet telephony or VoIP, in recent years, has been deemed a very important application on the Internet. A significant number of architectures are proposed to provide telephony services over packet-based networks. Among others, ITU-T Rec. H.323 is the primary standard for the Internet telephony. While the H.323 is continuously revised, there are, however, still many important issues needed to be further discussed. Among others, the call routing method among gatekeepers has not yet been well designed in the H.323, and the primitive method in the current version may cause the loads of the gatekeepers unbalanced. To resolve this problem, we devise in this paper an enhanced call routing method to deal with the load balancing problem among the gatekeepers. This method for load balancing is based on "Multiple-Registration with Multicasted LRQ". The simulation results show that the Call Blocking Rate and Channel Utilization are significantly improved by the proposed load-balancing method.