[OpenSIPS-Users] OpenSIPS : no 407 retransmission

[Yannick LE COENT]

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<users-bounces at lists.opensips.org>  on behalf of Yannick LE COENT<yannick.lecoent at nexcom.fr>
> Date: Friday, April 29, 2022 at 6:44 PM
> To:users at lists.opensips.org  <users at lists.opensips.org>
> 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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