Nowadays, VoIP is a technology with a great demand and wireless networks are increasingly deployed. Each of these has its own\ntechnology constraints. For VoIP, it is very important to take into consideration the need to provide a high quality service according\nto well-defined standard transmission (jitter, end-to-end delay, MOS, and packet loss). However, wireless networks (IEEE 802.11)\nare based on radio which undergoes a number of technical constraints to achieve theoretical transmission rates; among these\nconstraints the number of users of the networks, the distance between the client and the access, and the amount of data transmitted\npoint are included. In this term, a study is made by simulating wireless network in OPNET Modeler with a fairly large number of\nVoIPs (15 users) whose signaling is handled via a new node that was created specifically to manage the signaling tasks under SIP\nand H.323 in order to minimize the number of nodes in the network and avoid the congestion. In this paper, two scenarios are\ncompared; the first contains a number of VoIP users with SIP and H.323 signaling handled by the new created device; the second\nscenario is similar to the first except that the distance between the stations is remarkably lower.
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