Thank you for all the people that help me to implement SIP protocol in NS. Especially the guy that gave me the ns-2.27 patch I’m sorry because I delited the e-mail so I forgot his name so thank you guys !! OK my next part of the project is to trace the traffic from the .tr file generated by the files proxy-test.tcl and redirect-test.tcl with XGRAPH! If anyone had worked with the same project please help me GLORY TO NS COMMUNITY