Evaluating the performance of Voip in congested LTE network, by using parameters like Packet loss and End to end delay. the LTE network should be congested with services like FTP, HTTP and email services while the voip service is also being run. Also the performance of voip in non congested network will be evaulated, so as to be able to compare and contrast the reliabilty of voip when there is congestion and where there is not. Also codecs that can be used to improve voip whilst the lte network is being congested. the simulator tool i would like to use is OPNET.