Hello there, hopefully someone could help out a bit with this

I'm trying out the dart sip ua client demo, with a mostly default configured Freeswitch, running everything in my lan.

The issue is, that I'm getting 200 on registering to an extension e.g. sip:1000@my.fs.in.lan.ip, but I can't make any calls.

If I try and make a call from another client to the dart ua demo client, I'm just getting "Answered" which is rather weird. Also when I try to create a call from dart demo client to another client, I'm getting the next error "Level.error sip_ua_helper.dart:76 ::: Not connected, you will need to register"

Besides that, on my Freeswitch, I can see that I get registered with the demo app, and at the right extension, but with this weird contact e.g.

sofia/internal/sip:8y275sq0@8863bs810j58.invalid;fs_nat=yes;fs_path=sip%3A8y275sq0%40192.168.1.3%3A59518 

Is this weird? Am I missing something?