The routing of the ACK is done accordingly to the routing info in the ACK itself (like RURI and Route hdrs). To see which is the next hop (as SIP for the ACK), after the successful loose_route(), log the $ru and $du... And I understand you are actually using WSS, right ?

Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
  https://www.opensips-solutions.com
  https://www.siphub.com

On 29.11.2023 17:27, Andrew Colin wrote:

Hi Bogdan,

Seems to be in the context of the ACK yes.

Why would I be seeing proto 5 if we are using WSS then?

Kind Regards

*From: *Bogdan-Andrei Iancu <bog...@opensips.org>
*Date: *Wednesday, 29 November 2023 at 15:17
*To: *users@lists.opensips.org <users@lists.opensips.org>, Andrew Colin <andrew.co...@ipcortex.co.uk>
*Subject: *Re: [OpenSIPS-Users] Strange Nat issue

Hi Andrew,

Proto 5 is WS (not WSS). Can you confirm if the error occurs in the context of the ACK ?

Regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
   https://www.opensips-solutions.com
   https://www.siphub.com

On 29.11.2023 15:15, Andrew Colin via Users wrote:

    Hi All,

    Recently deployed opensips into AWS and when we make calls between
    2 webrtc clients I keep seeing this error in the logs and the call
    eventually drops after 32 seconds

    ERROR:tm:update_uac_dst: failed to fwd to af 2, proto 5  (no
    corresponding listening socket)

    ERROR:tm:t_forward_nonack: failure to add branches

    Normal SIP to SIP calls do not have the issue



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