* It is free software, or rather, the client they recommend is Linphone, an existing open-source VoIP client. * Specifically, the value add is an introduction/routing layer over SIP. They recommend connecting via Tor. * The encryption is stock ZRTP.

In comparison, Signal/TS is free software, but uses novel crypto for text messages. I believe RedPhone/Signal voice is still just ZRTP. RedPhone/Signal will convert the SAS code to two frequently-amusing phrases, whereas LinPhone will just display the raw code.

There doesn't seem to be an easy way to use RedPhone with Tor, or to anonymously register with RedPhone, though I could be wrong.

Redphone/Signal has its own signaling protocol for voice calls as well. This service uses SIP. The Redphone protocol is simple in design, while SIP is the opposite.

Agreed. Google cache: https://webcache.googleusercontent.com/search?q=cache:CoDOYa...

Ok on Tor but no https so anyone could get your number/password and steal your identity

http://hc3sz3i2rb5dljqq.onion/

Edit: my bad it's late...of course there is no risk of mitm as it's a tor service, so no risk of bad exit node -_-' sorry guys

That's not how Tor Hidden Services work. They're encrypted end-to-end (well, from your node to the host of the Hidden Service. So accessing via that address leaves no room* for anyone to get your number/password or steal your identity.

* (Usual caveats about that being the correct .onion address, about the encryption not flawed etc)

OK, we have moved to a server that can handle the load. It may take a bit for DNS to propagate for everyone!

We're moving it to a new server with lots more bandwidth!