Hello Ben,
The 407 is sent upstream, but when it is lost, it is not retransmitted
by OpenSIPS.
I do not have this problem with other negative status codes (e.g. 486).
This is clearly explained in
https://opensips.org/pub/opensips/1.8.6/src/ChangeLog
2012-03-21 18:36:58 Bogdan-Andrei Iancu, <bogdan at opensips dot org>
* [8811] :
TM will no longer do retransmission for the 407/401 replies (if
no ACK is received) for both local or proxied replies.
According to RFC 3261, retransmitting 407s/401s is probably a
bad idea:
26.3.2.4 DoS Protection
At the moment, my only solution is to use forward() instead of t_relay()
in order to use the stateless mode.
Yannick
Yannick,
The default behavior of OpenSIPS is to relay any received responses back
upstream. If it is not doing that it would have to be because you are stopping
it in the script. Take a look at the documentation for failure_route [1] which
explains this. Check your own failure_route in your script; you must be doing
something there that is telling OpenSIPS not to relay the 401/407 back upstream.
[1]https://www.opensips.org/Documentation/Script-Routes-2-4#toc3
Ben Newlin
From: Users<[email protected]> on behalf of Yannick LE
COENT<[email protected]>
Date: Friday, April 29, 2022 at 6:44 PM
To:[email protected] <[email protected]>
Subject: [OpenSIPS-Users] OpenSIPS : no 407 retransmission
EXTERNAL EMAIL - Please use caution with links and attachments
Hello,
I'm using OpenSIPS as a proxy in front of another proxy. The 2nd proxy
is in charge of authenticating the request.
This is the callflow:
Alice OpenSIPS Proxy#2
| INVITE | |
|--------------->| INVITE |
| 100 Tring |--------------->|
|<---------------| 407 |
| |<---------------|
| | ACK |
| |--------------->|
| 407 | |
| X<---------| |
| | |
Since OpenSIPS does not retransmit 401/407, the call setup gets stuck.
What can I do ?
If I set auto_100trying=1, that works, but this increases the number of
INVITE retransmissions since 180Ringing are not received instantly.
Do you have any suggestion ?
Thanks,
Yannick
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