Hello everyone,
I'm doing some custom Kamailio configuration to achieve few things but seem to be stuck with SIP trunks. I'm currently using Kamailio 4.4.5 and here is what I have at the moment:
*1.* Asterisk 11.25.1 servers behing Kamailio using RealTime for SIP peers.
*2.* Route that checks if packet was sent from one of configured SIP trunks. This part works correctly:
*route[FROMPSTN] {* * xlog("== FROMPSTN ==\n");* * $var(socket) = $si + ":" + $sp;* * xlog("**** $var(socket)\n");* * xlog("**** $(sht(trunks_kamailio=>$var(socket)))\n");* * if ($(sht(trunks_kamailio=>$var(socket))) != $null) {* * xlog("**** From $(sht(trunks_kamailio=>$var(socket))) PSTN\n");* * return 1;* * }* * xlog("**** Not from PSTN\n");* * return -1;* *}*
*3.* Here is a fragment that sends INVITE packet to *TOASTERISK* route if it was received from one of trunks. I have 4444444444@XXX.XXX.XXX.XXX hardcoded for now, and in my configuration 4444444444 and XXX.XXX.XXX.XXX represent my real caller id number and carrier's IP address:
*if(route(FROMPSTN)) {* * uac_replace_from("sip:4444444444@XXX.XXX.XXX.XXX");* * route(TOASTERISK);* *}*
*4.* TOASTERISK basically has folloving fragment that load balances traffic between Asterisk nodes:
*if(!ds_select_dst("0", "4")) {* * xlog("**** Call was not sent to none of Asterisk hosts\n");* * if(!is_method("REGISTER")) {* * xlog("**** Method is not REGISTER\n");* * send_reply("404", "No destination");* * }* * xlog("**** Dispatcher fail\n");* * exit;* *}*
So when I'm making a call to my test number, I can see following incomming packet in Asterisk from Kamailio. From header has correct caller id number and carrier's IP address (192.168.88.5 is Kamailio's internal IP address): [image: Вбудоване зображення 1]
And when Asterisk tries to find a maching peer for this incoming call, it is using Kamailio's instead of Carrier's IP address. So it is actually finds one of peers (101-XXXXXXX) that is being authenticated on Kamailio as many others: [image: Вбудоване зображення 2]
I'm not sure if Asterisk is just using packet's source IP to lookup for corresponding peer or something else from it's content. I will really appreciate any help on this.
Thanks a lot!
