Since the router is not SIP aware, you have two possibilities:
- using STUN without port forwarding (direct call from outside not possible)
- using port forwarding (5060 + audio stream dynamic ports) without STUN
If you mix port forwarding and STUN, you'll have troubles... (Even if sometimes it works fine, it is not reliable and can behave differently from call to call).
I would first test with only STUN, removing all forwarding rules from NAT.
You can also use the STUN from JustVoip with Voxalot account, I already got some compatibility issues with the one from Voxalot in the past.
If STUN still fails, this is probably because of your NAT which is badly implemented or is symmetric. But since your JustVoip account works fine, I don't think so.
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