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[thilo at ginkel.com]

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

[brian at freeswitch.com]

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@ginkel.com (thilo@ginkel.com)> wrote: