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This work presents a study of a SIP-based IP telephony system in terms of Quality of Service (QoS) and admission probability. The system is designed for an enterprise with offices in different countries. A software IP PBX maintains the dial plan, and SIP proxies are used in order to implement Call Admission Control (CAC) and to allow the sharing of the(More)
Real time services are very challenging for current network infrastructures. One of these services is online gaming, which is acquiring more importance during the last years. The quality experienced by users could be improved by the use of a smarter network, which includes some proxies near the players in order to transfer intelligence from the game server(More)
This work presents a simulation study of the influence of a multiplexing method on the parameters that define the subjective quality for online games, mainly delay, jitter and packet loss. The results for an available subjective quality estimator from the literature are also shown. Two buffer implementations, each one with two buffer sizes, are tested in(More)
The behaviour of the routers' buffer is of primary importance when studying network traffic, since it may modify some characteristics, as delay or jitter, and may also drop packets. As a consequence, the characterization of this buffer is interesting, especially when real-time flows of interactive services are being transmitted. If the buffer(More)
—This letter compares different policies for multiplex-ing the traffic of online games. In order to achieve bandwidth savings and to alleviate the high packet rate, headers are compressed and a number of native packets are included into a bigger one, using PPPMux and an L2TP tunnel. Small and controlled delays and jitter are added due to retention at the(More)
This work presents a Call Admission Control (CAC) system for a SIP-based IP Telephony platform. Configured for a multi-branch enterprise environment, the system enables international calls to be established in two steps: one step using Voice over IP (VoIP) through the Internet between the local office and a VoIP-PSTN gateway placed at destination country,(More)
— The multimedia landscape is evolving towards more customized services which imply increasingly stringent requirements on networks. The triple-Play environment is insufficient to adapt to each requested service and deliver it over the Internet with guaranteed Quality of Experience (QoE). Next Generation Networks (NGNs) are tackling this limitation bringing(More)