30 Dec
2024
30 Dec
'24
3:50 a.m.
Hello Benoit,
let's focus on the topos topic then and try to solve it. This should then help in this
scenario a lot. I just wrote you another e-mail about it.
Cheers,
Henning
-----Original Message-----
From: Benoît Panizzon via sr-users <sr-users(a)lists.kamailio.org>
Sent: Montag, 30. Dezember 2024 08:39
To: James Browne via sr-users <sr-users(a)lists.kamailio.org>
Cc: Benoît Panizzon <benoit.panizzon(a)imp.ch>
Subject: [SR-Users] Re: how to call loose_route() after adding route header
without using msg_apply_changes?
Hi James
I've two suggestions (three if we count
agreeing with Alex's
suggestion to consider not supporting that UA).
Unfortunately, at the moment, not an option.
- Get kamailio to manually do the steps that
loose_route() would do
anyway. This is messy, because it requires good understanding of loose
routing. You might remove the supplied Route header field, then get
the transport/host/port from your saved Record-Route header fields,
and then set the $du and $fs explicitly (and then get any _other_
Record-Route values and insert them as Route values), all while being
aware of "r2" parameters (to know whether to exclude one or two Route
values). It might work, but I don't think I'd ever want to even
attempt this nonsense.
I started working in this direction and got this working for transport UDP. After
that, I noticed that not msg_apply_changes() caused the issue, but that by
mistake I was indeed calling rtpengine_manage() twice in some re-invite
situations which caused the duplicate SDP.
- Add TOPOS to kamailio. That strips the topology
from the message,
and then the faulty UA should never see Route or Record-Route header
fields so never wreck them. It requires kamailio to keep state in a
database, though, but it should work well.
I found TOPOS not being able to cope with spiralling calls in this situation
which is very common:
* Two customer, Alice and Bob, registered on the same Kamailio Registrar
running TOPOS.
* Kamailio Registrar are not dialog aware and do not route calls. For
this there is a central 'core' kamailio instance running dialog,
gathering CDR and knowing how to route calls.
So the call flow is:
Alice => Registrar => Core => Registrar => Bob
The same call passes the registrar twice. This, as I observe (it's still possible I
did something wrong), breaks topos and header get replaced the wrong way!
--
Mit freundlichen Grüssen
-Benoît Panizzon- @ HomeOffice und normal erreichbar
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