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[liberationtech] Fwd: Firefox OS with built in support for OpenPGP encryption

Nathan of Guardian nathan at
Sat Sep 21 05:14:08 PDT 2013

Eugen Leitl <eugen at> wrote:

>Many mobile networks operate with carrier grade NAT, so with
>MiFi your WLAN devices are already behind two layers of NAT
>or more. 
>So far stock solution for VoIP has been SIP, but SIP is a terrible
>protocol to tunnel through NAT. So far the only contender I'm
>aware of is Jingle, anything else I'm missing?

At least with our service, we offer an RTP media proxy, so all of your streams (encrypted of course) proxy through our service, removing the need for NAT.

If you want to make plain old telephone calls through a service like Callcentric, I think you can also find a workeable solution for the NAT issue, but I don't have it documented exactly.

The other aspect of this setup is that you can also use something like Google Voice (if you trust Google of course) as you SMS and voicemail system. You can access it via the app through Orbot/Tor on Android without a problem. You can have your Google Voice number forward to your Callcentric number for when you are online with the Mifi device, or at any public or private hotspot. 

For uses outside of the US, you can buy a phone number on a site like DIDWW in many countries, and have that route to a SIP/VoIP account.

I know this might seem very complicated to some, but it isn't that much harder than setting up a Skype number.


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