If you call your landline number and the phone connected to the Voipo adapter rings, that's a pretty good indication that the port is complete. Another is that when you open the Voipo admin panel, you see only your original number and not the temporary number.

As for hookup - it depends. For me, my adapter simply did not work when placed between the WAN and my router. This configuration, theoretically, is better because you don't have to fuss with port forwarding and the like. But it does mean that ALL your Internet traffic must pass through the adapter, and that may create issues for you. I would suggest trying it this way first and seeing if you notice any problems.

For placing the adapter inside your LAN, you may have to set up port forwarding on your router to make sure that the adapter sees all the connections it should. If this is not done, you may get calls failing to go through, dropped or poor voice quality.

If you are making 7-digit calls, try pressing # after the last digit - this tells the adapter that you're done dialing and not to expect more digits. Some people have more problems with this than others. I find that the delay is more like 5-6 seconds, so if yours is much longer then you should involve support.