Internet telephony: architecture and protocols—an IETF perspective
Computer Networks: The International Journal of Computer and Telecommunications Networking - Special issue on Internet telephony
The role of signaling in quality of service enabled networks
IEEE Communications Magazine
Integration of call signaling and resource management for IP telephony
IEEE Network: The Magazine of Global Internetworking
Advanced services architectures for Internet telephony: a critical overview
IEEE Network: The Magazine of Global Internetworking
Toward an all-IP-based UMTS system architecture
IEEE Network: The Magazine of Global Internetworking
QoS control by means of COPS to support SIP-based applications
IEEE Network: The Magazine of Global Internetworking
IPOM'05 Proceedings of the 5th IEEE international conference on Operations and Management in IP-Based Networks
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Interactive multimedia applications combine requirements of traditional telephony services and Internet applications. This requires call setup, call signaling, negotiation, routing, and network resources. However, in dynamic network environments resources are not protected unless the applications reserve them for the multimedia session. To provide quality of service (QoS) control, the subject of the interaction of call signaling and resource management have addressed resource reservation during the call setup phase. Usually, the rule is to use the traditional telephony-style call setup model (i.e. users are only alerted after all resources have been successfully reserved for the call). In the Internet, however, this may incur in long call setup delays and a high call blocking rate ('no QoS/no call'). In order to provide users with a practical and fast way to reserve resources during session setup, we investigate a different call setup model than that of traditional telephony. Our model allows users to be alerted while the resource reservation takes place, thus, taking advantage of parallel user answering delays and reservation delays. For this to occur efficiently, we use existing elements of the Session Initiation Protocol (SIP) to provide means for independent call setup and resource management transactions and flow negotiation. Based on experimental comparisons obtained in a multimedia call, we demonstrate that the proposed approach reduces the impact of the reservation delays, with maximum call setup delay improvements when we have approximate values of reservation and answering delays.