18 Oct
2023
18 Oct
'23
11:38 a.m.
Hello,
I'm using Kamailio as SIP proxy between Session Manager and SBC
So here is the scenario :
Session Manager sends a call (Invite) to Kamailio, kamailio needs to relay it to SBC after
doing some modification.
(-----Session Manager-----) ----------- > (----Kamailio----) ----------- >
(-----SBC-----)
My routing logic is similar to the below:
route{
if ((method==OPTIONS) && (! uri=~"sip:.*[@]+.*")) {
options_reply();
}
if (is_method("INVITE")) {
sql_query("cb", "select number from pool1 order by random() limit 1",
"ra");
$var(rand)=$dbr(ra=>[0,0]);
uac_replace_from($var(rand),"sip:$var(rand)@192.168.1.1");
xlog("L_INFO","Random: $var(rand)");
$var(ip) = $(ct{s.select,1,(a)}{s.select,0,;}{s.replace,>,}),});
remove_hf("Contact");
insert_hf("Contact: $var(rand) <sip:$var(rand)@$var(ip)>\r\n");
remove_hf("P-Asserted-Identity");
remove_hf("Route");
insert_hf("Route: <sip: 192.168.1.10>\r\n","Route");
record_route();
t_relay();
$td = "192.168.1.10";
$rd = "192.168.1.10";
t_relay();
}
}
Where:
192.168.1.1 is Kamailio IP
192.168.1.10 is SBC IP
My question here is that Kamailio handle all in dialog messages between Session Manager
and SBC?
For example, after forwarding the invite packet to SBC, SBC sends 183 Session Progress to
Kamailio, which in its turn relay it to the session manager, knowing that this is not
mentioned in my routing logic, so how Kamailio knew that it must relay it to session
manager in this case?
Also I need to add to the 183 Session Progress sent to session manager by Kamailio record
route and Via headers , how to do it ?
Regards,