Hello I am new with kamailio, and trying to add prefix to Request URI ($rU). I use branch_route,  for $rU=”prefix”+$rU, i got two time prefix adding  =>   prefix_prefix_original$rU This is my code small code: request_route {                 if (is_method("INVITE")) {                                $var(ip1)="51.254.245.58";                                $var(port1)="33";                                if(!t_is_set("branch_route")) route(FWD);                                xlog("L_ALERT","Route FWD is executed from ip:$si to ip:$rd \n");                 }                 exit; } route[FWD] {                 t_on_branch("CHECK");                 t_relay(); }                                branch_route[CHECK] {                 $rd=$var(ip1);                 $rU=$var(port1)+$rU;                 xlog("L_ALERT","dst rewrited: $rU \n"); } LOG FILES : Mar 28 19:34:45 ns3033789 systemd[1]: Started LSB: Start the Kamailio SIP proxy server. Mar 28 19:34:54 ns3033789 /usr/sbin/kamailio[2859]: ALERT: <script>: dst rewrited: 3322508983432 Mar 28 19:34:54 ns3033789 /usr/sbin/kamailio[2859]: ALERT: <script>: Route FWD is executed from ip:51.254.245.57 to ip:5.135.177.203 Mar 28 19:34:54 ns3033789 /usr/sbin/kamailio[2859]: ALERT: <script>: dst rewrited: 333322508983432 Mar 28 19:34:54 ns3033789 /usr/sbin/kamailio[2859]: ALERT: <script>: Route FWD is executed from ip:5.135.177.203 to ip:51.254.245.58 Mar 28 19:35:01 ns3033789 CRON[2915]: (root) CMD (/usr/local/rtm/bin/rtm 8 > /dev/null 2> /dev/null) ^C root@ns3033789:~# May someone advise me Thank you in advance