Thanks for this. The instructions are really detailed and were no doubt the result of a great deal of work.

Unfortunately I am getting lost in it all. I just want to enable VOIP calling on my tablet using Google Voice, Gizmo and/or DialCentral and just having an exasperating time.

I can call out from the tablet using Gizmo, but cannot hear the person responding (they hear me). Searching on the subject led me to believe my firewall could be the culprit... so I followed instructions to open the necessary ports and no improvement. This worked last year without any firewall configuration.

Here is what I found on ports:

My FIOS router (Westell) does not distinguish between incoming and outgoing ports for forwarding... as far as I can tell. I have tried "Any -> 5004", "5004 -> 5004" and neither has any effect.

I obtained a Gizmo number long ago, and it also worked last year... but now Gizmo does not respond to calls in to the tablet. Nothing has changed to the forwarding at Google Voice. Interestingly, if I dial my Gizmo number, I get an error -- if I dial with the area code, a voice tells me I need to include the area code (!!!); if I dial without it, I get "call cannot be completed as dialed". They don't make it completely clear, but Gizmo seems to be stating that numbers now expire if they're not funded periodically-- is this true?

Dialcentral connects to my Google Voice account just fine but when I try to dial any number out, nothing happens.

I'm trying to go back to using gtalk2voip, but even that isn't working right anymore. I wanted to purchase credits via these instructions:

...but instead of bringing up an account page for me I get a message letting me know I can send an SMS to my wife!

Ay yi yi... this is beyond exasperating. I just want to be able to make VOIP calls while I'm in Amsterdam, and the process seems to have gotten WORSE since I used it last...

EDIT: this is weird. I can still use Gtalk2voip from the N810 to any Google contacts, but the problem I had with Gizmo is reversed: I hear them on the tablet but they don't hear me on their phone. This is making me nuts...