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PrivateGSM Enterprise
Quick Start Guide for Android

This guide provides you easy step-by-step instructions to help you get started with PrivateGSM Enterprise.

Making a secure call with PrivateGSM

Calling with PrivateGSM is very easy. Select the “Contacts” tab. After your address appears and select a contact to initiate a secure call.

 

figure 1. application main view
figure 2. your address book is shared with PrivateGSM

To make a secure call, you and the called party must have PrivateGSM software running on the mobile device, be connected to the Internet and to the same SIP server.

You can make a secure call to any arbitrary number (presuming that the call peer has PrivateGSM connected) by selecting the “DialPad” tab and entering the number.

figure 3. PrivateGSM dial pad

Receiving a secure call with PrivateGSM

Once PrivateGSM is installed and all the settings are correctly configured on your device, you are able to receive a secure call. PrivateGSM displays a screen when an incoming secure call is arrives to your phone. Press the Accept button to allow the connection. After the system have exchanged and verified the security keys the you can start the conversation.

To receive a secure call PrivateGSM has to be running and be connected to the Internet.

figure 4. you are receiving a secure call

Call connection phases

To establish a call PrivateGSM completes three phases shown by three icons:

1. Red light: the connection is starting. This step may take several seconds.
3. Green light: secure call is established. You can now speak securely.

The Yellow light is not listed because the key exchange phase is so fast that it can't be displayed.

Checking your security

A PrivateGSM call is always encrypted. The call is automatically secured during the call setup. As soon as the call is established you can immediately start to talk securely with your call peer.

The security of the call is based on a digital certificate verification on the SIP/TLS server. If a certificate error appears check whether the date of your phone is correct. If the date is correct it is possible that the certificate is wrong, misconfigured or expired or that your phone is undergoing a security attack. In these cases always contact your system administrator.

figure 5.
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