[OpenSIPS-Users] OpenSIPS : no 407 retransmission

[Ben Newlin]

I see. Apologies, I misunderstood the problem scenario.

Ben Newlin

From: Users <users-bounces at lists.opensips.org> on behalf of Yannick LE COENT <yannick.lecoent at nexcom.fr>
Date: Saturday, April 30, 2022 at 5:46 AM
To: OpenSIPS users mailling list <users at lists.opensips.org>
Subject: Re: [OpenSIPS-Users] OpenSIPS : no 407 retransmission
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________________________________
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<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<https://www.opensips.org/Documentation/Script-Routes-2-4#toc3>



Ben Newlin



From: Users <users-bounces at lists.opensips.org><mailto:users-bounces at lists.opensips.org> on behalf of Yannick LE COENT <yannick.lecoent at nexcom.fr><mailto:yannick.lecoent at nexcom.fr>

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

To: users at lists.opensips.org<mailto:users at lists.opensips.org> <users at lists.opensips.org><mailto:users at lists.opensips.org>

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

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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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