Re: [OpenSIPS-Users] OpenSIPS : no 407 retransmission

Tue, 03 May 2022 08:16:47 -0700 

Hello Daniel,

This is not what I looking for.
My OpenSIPS instance is working as a relay between the softphone and another proxy (proxy#2 in the call). 
So it does not handle authentication.

Alice           OpenSIPS          Proxy#2
   | INVITE         |                |
|--------------->| INVITE         |
   |      100 Tring |--------------->|
|<---------------|            407 |
|                |<---------------|
|                | ACK            |
|                |--------------->|
|            407 |                |
   | X<---------|                |
   |  (no retrans.) |                |
When the 407 is lost between OpenSIPS and Alice, it is not retransmitted by OpenSIPS. 

I would like to force retransmission.

Thanks,
Yannick

Le 03/05/2022 à 15:16, Daniel Zanutti a écrit :

Generate in Stateful -> www_challenge or proxy_challenge?
https://opensips.org/html/docs/modules/3.2.x/auth.html

Is this what you are looking for?
On Tue, May 3, 2022 at 3:50 AM Yannick LE COENT <[email protected]> wrote: 

    Hello all,

    Could you tell if there is a way to enable 407 in stateful mode ?

    Thanks,
    Yannick

    Le 30/04/2022 à 18:14, Yannick LE COENT a écrit :

    Hello Ben,

    Thanks for your answer.

    This problem occurs when OpenSIPS is not in charge of
    authenticating the INVITE request, but this is done downstream.
    I've sent this question to know if somebody has already solved
    this kind of problem.

    Best regards,
    Yannick

    Le 30/04/2022 à 16:15, Ben Newlin a écrit :


    I see. Apologies, I misunderstood the problem scenario.

    Ben Newlin

    *From: *Users <[email protected]>
    <mailto:[email protected]> on behalf of Yannick
    LE COENT <[email protected]>
    <mailto:[email protected]>
    *Date: *Saturday, April 30, 2022 at 5:46 AM
    *To: *OpenSIPS users mailling list <[email protected]>
    <mailto:[email protected]>
    *Subject: *Re: [OpenSIPS-Users] OpenSIPS : no 407 retransmission

    *EXTERNAL EMAIL - Please use caution with links and attachments *

    ------------------------------------------------------------------------

    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]>  
<mailto:[email protected]>  on behalf of Yannick LE 
COENT<[email protected]>  <mailto:[email protected]>

        Date: Friday, April 29, 2022 at 6:44 PM

        To:[email protected]  <[email protected]>  
<mailto:[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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