I would like to report success with the Billon BiPAC 7404VGO 5.52g VoIP VPN router.
It configured as you would expect, with one major exception:
Where is asks for your Phone Number, and you think you would enter the geographic number here, you actually need to enter your username again (which is your extension number on Plus Trial)!
(In fact this really caught me out using the other phone port to register my voipuser.org account, as it needed my alphabetic username entering into this "phone number" entry. But again with those settings it works a treat.)
With my geographic number entered it was reporting as "registered" at my end, but not showing up as registered at Gradwell. Any attempted calls were greeted with beeps. Changing this to my username, solved all the problems, and calling is working correctly inbound & outbound.
I successfully have my DECT handsets & internal fixed phones all on port 1 of the router (PlusTalk VoiP Trial), so they all ring with a different ring tone depending on whether it is an incoming call via BT or VoIP. I can ring out using either two using the same phone.
All other settings are taken from the signup emails.
I needed no stun or proxy settings. No firewall or port forwarding settings. It just works now.
If anyone needs help with a Billion router then you can PM me here.
Mike