Can't connect to sip trunk

Hello,
maybe someone here can help me.
I have installed freepbx on my ubuntu server via izpbx in docker.
Now I am configuring it and run into a problem. I am trying to connect my sip trunk to freepbx but whatever I try - it doesn’t work…
My sip provider has a dedicated documentation to configure freepbx that I followed multiple times but I always get the error
[2026-07-04 15:07:17] WARNING[249785] res_pjsip_outbound_registration.c: No response received from ‘sip:voip.easybell.de:5060’ on registration attempt to ‘sip:[email protected]:5060’, retrying in ‘60’
I googled and looked up everything but I don’t know how to fix this. My credentials are all correct, I verified multipe times. Also the same sip trunk works fine f.e. directly in zoiper.

I attach my configuration in freepbx and an excerpt of my asterisk logs - maybe somene here can help…

Thank you!

image

You don’t have a working DNS environment, as voip.easybell.de definitely returns an answer for A records.

;; ANSWER SECTION:
voip.easybell.de``. 60 IN A 195.185.187.16

You haven’t even sent the REGISTER. (Note that you would get a response to the REGISTER, even if you had the wrong credentials, provided the server address was correct and your internet access was working. I suspect there is a problem in your Docker setup.

That was it!!

Thank you very much, I was literally going crazy…

Works now.