[Freeswitch-users] Understanding why FS replies with "407 Proxy Authentication Required" on internal INVITE

[Brian West]

Look at where it's sending the 407, bet you the device never receives the
challenge, most likely due to nat related settings.

On Thu, May 20, 2021 at 8:26 AM Thilo-Alexander Ginkel <thilo at ginkel.com>
wrote:

> Hello everyone,
>
> we have a current FreeSWITCH installation (v1.10.6) that interfaces
> internal users with upstream gateways. All clients work flawlessly, except
> for an AVM FritzBox (short: FB), which exhibits the following behavior:
>
> When FB initiates a call to another user or external number, FreeSWITCH
> responds with a "407 Proxy Authentication Required" response although the
> dialplan is the same as for the clients that do not exhibit this behavior.
> This confuses the FB's SIP stack, which consequently reports a timeout and
> drops the call.
>
> A (redacted) SIP trace is available at:
> https://gist.github.com/ginkel/5c7dd3723f92e0137d5f357451dc7ac6
>
> All clients as well the FS server reside in the same RFC1918 network.
>
> Other Polycom or Yealink clients are unaffected.
>
> Any ideas what might cause this?
>
> Thanks,
> Thilo
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