hi all, I have configure nathelper in kamailio, but it does not work as I expect. I using function : force_rpt_proxy("","115.X.X.190") to change ip_add of SDP packet. But I see that value c= <ip add > not change to c=<115.X.X.190>. thanks for help. ThanhTruong HTK-INC Co.,Ltd http://www.htk-inc.com/ http://pbxvn.com/forum/