I did more works and see that by changing the traffic type in hex_grid_tilted_traffic to voip and then running the program the config shows voip but still the UE shows fullbuffer. So I guess the reason why changing the parameters does not change the results is that the type is not voip yet. I did try everything in every related file that is possible to change the type and parameters such as voice size, interval, etc. but nothing seems to work. I stuck on this for more than 3 weeks. Can please someone kindly help me to make traffic model works.
Really appreciate any help