Solving the Delay problem in Voice over Internet Protocol (VOIP) Over Wireless LAN

Voice over Internet Protocol (VoIP) technology has been rapidly growing up these days and is expected to be supported widely in wireless network. There are several issues in VoIP; the Quality of Service (QOS) is the most important one. There are many factors that affect QOS such as throughput, echo, delay, jitter, packet loss, bandwidth and delay variation. The effect of delay on speech quality in VOIP will be improved. The source of the delay is the buffer that already exists in the multiplexing node and also the process that can be done on the packets before sending them to the multicast node. This problem can be solved by using the proposed multiplexer –multicast algorithm that combine the data which come from several streams into a single large packet, where the packet that comes first is send over multiplexer for multicast. The result will be compared with original multiplexer-multicast algorithm that combine multiple channels into one channel, then multiplexer send all packets at the same time for multicast. We used OPNET IT Guru Academic Edition simulation for network performance analysis