20 Jun
2017
20 Jun
'17
6 p.m.
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(a)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!
