To get started using Zfone, simply open Gizmo via the menu or desktop icon. You'll see the Zfone interface shown in Figure 1.
Figure 1 Zfone is running but not yet connected.
You should see the word IDLE in the center of the dialog box. If you see NO IP, restart the zfoned daemon:
# /etc/init.d/zfone restart
If you see two connection displays, the upper one is audio, the lower one is video. It's quite possible to have secure audio and unsecured video. In that case, I suggest shutting off your camera, since part of the point of securing communication is to prevent an unauthorized listener from either identifying the parties to the conversation or reading lips.
Make a test call to an echo test number, as shown in Figure 2.
Figure 2 Zfone is running, but no Zfone client is attached at the other end.
Now, try calling a number that you know has a working Zfone installation. As soon as the Zfone crypto client is connected, you'll hear a brief DTMF tone, a brief dial tone, and you'll see the dialog box shown in Figure 3.
Figure 3 Secure connection established.
The words in the Compare with Partner section are a "shared secret" you read to your called party. If what your party hears is not what you see, either you or they have a software problem, or your call has been intercepted.