8 Jun
2024
8 Jun
'24
2:47 a.m.
I am trying to proxy a request from server A to server C with me being server B. i send
the invite from A to B, then i need to send to server R which returns back to me a 300
redirect, which i then need to take the answer from the Contsct and then proxy the
original invite from A to C. server A can not handle 3xx responses and must be proxied.
I havent been able to find any examples where the 300 is intercepted and a new invite to
the target is sent. i have the following code but it results in no new INVITE and the
original session is hung until it is canceled. Any idea what i may be doing wrong? In
the example below i am just hardcoding the uri for the new invite instead of getting from
the Contact as a debug exercise. I am using Kamailio 5.7.3
route[HANDLEREDIRECT] {
xlog("L_INFO", "DBG: HANDLEREDIRECT");
msg_apply_changes();
$var(test) = $hdr(Contact);
xlog("L_INFO","DBG: redirect headers [$var(test)]: from=[$fu]
from_user=[$fU], to=[$tu] to_user=[$tU]");
# send to gateway
$var(new_uri) = "sip:" + $tU + "@" + "gateway";
if ($var(new_uri) != "") {
xlog("DBG: Redirecting to: $var(new_uri)\n");
$ru = $var(new_uri);
$tu = $ru;
record_route();
route(RELAY);
exit;
# i have also tried using
#t_newtran();
# and
#t_relay();
} else {
xlog("DBG: No contact header found in 300 response\n");
}
}
# Manage outgoing branches
branch_route[MANAGE_BRANCH] {
xdbg("DBG: new branch [$T_branch_idx] to $ru\n");
xlog("L_INFO", "DBG: manage branch");
route(NATMANAGE);
return;
}
onreply_route[MANAGE_REPLY] {
xdbg("DBG: incoming reply\n");
xlog("L_INFO", "DBG: manage reply");
if (t_check_status("3[0-9][0-9]")) {
xlog("L_INFO", "DBG: got 3xx redirect");
route(HANDLEREDIRECT);
drop;
}
return;
}
I also tried using uac_redirect module, but it stalls the incoming invite also, and i cant
figure out how to modify the uri from the contact before sending (to add params)
# Manage failure routing cases
failure_route[MANAGE_FAILURE] {
route(NATMANAGE);
if (t_is_canceled()) exit;
if (t_check_status("3[0-9][0-9]")) {
xlog("L_INFO", "DBG: following 3xx redirect");
get_redirects("3:1");
t_relay();
exit;
}
}
Rob Green
Chief Information Officer (CIO)
Tel: 1-352-218-1490
Cell: 1-407-620-0932
Email: rob.green(a)nuwave.com
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