23 Jun
2019
23 Jun
'19
10:39 a.m.
Hi team!
I’ve recently found an issue in my Kamailio setup. It appears when the trunk replies to
call in progress with a BYE, we relay it immediately back to them:
https://i.imgur.com/h5fusau.png <https://i.imgur.com/h5fusau.png>
The only differences in the second BYE is the Route header is removed and replaced with a
Via header referencing the Kamailio machine, and the From URI is rewritten to show the
Kamailio hostname.
I’m unsure what steps I can take here, as all of my out of dialog messages (180, 200, ACK)
are forwarded along with no issue. It seems only the in dialog are having this issue.
Here’s my WITHINDLG and RELAY:
def ksr_route_relay()
if KSR.is_method_in("IBSU") then
if KSR::TM.t_is_set("branch_route") < 0 then
KSR::TM.t_on_branch("ksr_branch_manage")
end
end
if KSR.is_method_in("ISU") then
if KSR::TM.t_is_set("onreply_route") < 0 then
KSR::TM.t_on_reply("ksr_onreply_manage")
end
#KSR.info("Onreply route:
#{KSR::TM.t_is_set("onreply_route")}")
end
if KSR.is_INVITE() then
if KSR::TM.t_is_set("failure_route") < 0 then
KSR::TM.t_on_failure("ksr_failure_manage")
end
end
if KSR::TM.t_relay() < 0 then
KSR::SL.sl_reply_error()
end
exit
end
def ksr_route_withindlg()
return if KSR::SIPUTILS.has_totag() < 0
if KSR::RR.loose_route() > 0 then
ksr_route_dlguri()
if KSR.is_BYE() then
#KSR.setflag($myenv['FLT_ACC'].to_i)
#KSR.setflag($myenv['FLT_ACCFAILED'].to_i)
elsif KSR.is_ACK() then
ksr_route_natmanage()
elsif KSR.is_NOTIFY() then
KSR::RR.record_route()
end
ksr_route_relay()
exit
end
if KSR.is_ACK() then
#KSR.info("Handling an ACK within dialog")
if KSR::TM.t_check_trans() > 0 then
ksr_route_relay()
exit
else
exit
end
end
#KSR.info("404ing within dialog")
KSR::SL.sl_send_reply(404, "Not here");
exit
end
I suspect I must be sending this to the wrong branch somehow, but I’m unsure how to
correct this. The call gets originally initiated from Kamailio writing a custom RURI and
To header before calling t_relay(). I’m wondering if I’m somehow initiating the dialog
incorrectly and as such the BYE doesn’t know where to go.
Thanks!
Andrew
