The present manual offers a guide for installing and first time configuring the PrivateServer which along with PrivateGSM composes the Enterprise Voice Security Suite: the solution that ensures the safety and inviolability of voice communications on both mobile and fixed phones by offering a secure voice convergence system in a corporate network.


PrivateServer works on VoIP technology (Voice over IP) and requires an internet access. Thus the server chosed for installation (either phisical or virtual) must have almost one Network Interface Card on board.


The present manual will explain to you how to:

  • install PrivateServer from cdrom or by virtual machine
  • configure the Network
  • configure your certificates
  • organize the network security architecture
  • perform backup and restore
  • perform software upgrades

Intended audience

This guide is intended for system administrators who will configure a secure enterprise voice network based on PrivateServer.The reader should have a networking and system administration background. VoIP knowledge is not mandatory, but strongly suggested.

This manual won't explain how to manage the service itself (ie create users, groups, SIP trunk, etc). For such knowledge please refer to the PrivateServer User Manual.


In the present documentation you'll meet the following terms:


private branch exchange (PBX) is a telephone exchange that serves a particular business or office, as opposed to one that a common carrier or telephone company operates for many businesses or for the general public. 

PBXs make connections among the internal telephones of a private organization—usually a business—and also connect them to the public switched telephone network (PSTN) via trunk lines.


trunk line is a circuit connecting telephone switchboards (or other switching equipment), as distinguished from local loop circuit which extends from telephone exchange switching equipment to individual telephones or information origination/termination equipment.

When dealing with a private branch exchange (PBX), trunk lines are the phone lines coming into the PBX from the telephone provider. This differentiates these incoming lines from extension lines that connect the PBX to (usually) individual phone sets. 


telephone extension is an internal telephone line attached to a Private branch exchange (PBX). The PBX operates much as a community switchboard does for a geographic telephone numbering plan and allows multiple lines inside the office to connect without each phone requiring a separate outside line. In these systems, a dialer usually has to dial a number to tell the PBX to connect with a landline to dial an external number. Within the PBX, the user merely dials the extension number of the person. Each phone line may be extended up to a fixed maximum.

Secure Call

A Secure Call is a voice connection which can't be wiretapped. It runs on the Voice Over IP (VoIP) communication protocol and can be used in two classification models:

  • End to end
  • End to site
The end to end provides the highest security level but can be used only between two PrivateGSM equipped devices.
The end to site provides a strong security level and can be used among two or more PrivateGSM equipped devices and/or among SNOM 300 landline devices or also for connecting other non-secure PBX. In this case the call is secured in the PrivateGSM to PrivateServer leg but is not secured on the PrivateServer to PBX one.


PrivateServer is the PBX committed to perform Secure Calls both end to end and end to site. It differs from a standard PBX for exposing just the Secure Call service to VoIP PrivateGSM clients and can be connected to a standard PBX via SIP Trunks if configured accordingly.


PrivateGSM is the VoIP client for Secure Calls connections. It has to be used along with PrivateServer and is deployed in two different models to perform two different secure models:

  • PrivateGSM Professional: used for end to end communications
  • PrivateGSM Enterprise: used for end to site communications

Because of the security model each one implements, the two versions can't communicate with each other. Plus, the PrivateGSM Professional edition can only perform direct calls to another PrivateGSM Professional Devices. On the other hand the PrivateGSM Enterprise Edition can also perform Conference Calls and Three-Way Calls.

Conference Calls

The conference call is a call in which more than one person can partecipate. The conference calls are usually defined as "rooms" which access can be limted by time settings or pass code. In PrivateServer the conference calls can be provided on a Secure Call base if using the PrivateGSM Enterprise Edition only.

Three-Way Calls

The Three-Way call, as the name implies, is a call among three partecipants. The third user is added to a precedent running conversation by one of the two talkers. 

Call transfer

Call transfer is a typical PBX performance which is implemented in PrivateServer as well, but only if the users are running a PrivateGSM Enterprise Edition. One of the talkers can hold on his/hers peer and perform a new call to the number to which trasfer the call. If the desired number picks up the call, then the transferrer can close the communication and let his/hers peer talk with the trasferred number.


Jitter is the undesired deviation from true periodicity of an assumed periodic signal in electronics and telecommunications. The Jitter we talk about is observed in the frequency of successive voice network packets. Jitter is a significant, and usually undesired, factor in the design of almost all communications links.

Jitter period is the interval between two times of maximum effect (or minimum effect) of a signal characteristic that varies regularly with time. 

Jitter frequency, the more commonly quoted figure, is its inverse.

Automatic Activation 

The Automatic Activation is the way of create new users automatically without any need they interact with anybody. As from user's side the procedure is that he/she gets first an invite SMS useful to download the application PrivateGSM and then a configuration SMS which provides automatic configuration of the client itself. All the user has to do is follow the links into both the SMSes and it goes automatically on line.


The Provisioning is the configuration needed for delivering both for the PrivateGSM application and its configuration and nowadays it's used by the Automatic Activation only. 


The figures in this document are solely for illustrative purposes. They give you an idea about the essential information you are supposed to see on the screen while executing the test cases. However the layout of the screen and the details of the information may be changed in subsequent revisions of the software and these modifications are not obligatory reflected in this document. When considering whether a test case passed or not, you should relay only on the textual description of the test case. 


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