• Secure voice and

  • conference calls

  • Chat + file transfer

  • Highest security

  • No data on the smartphone

  • Instantly available via app stores

  • Multi-platform: iOS, Android and PC client

  • Selectable features

  • Own telephone book

  • Bluetooth possible

  • GUI: DE, EN, RU, ES, simplified CN

  • Flexible – expandable as required

  • Savings in roaming

  • Self-administration possible


  • Government solution usable worldwide

  • On-Premise or as a Service by ICSL available

  • Using Silentel is as easy as Skype or Whatsapp

  • also Windows PC client available

  • Instant conference call without a conference server

  • any file transfer possible

  • GUI in DE, EN, RU, ES, simplified CN

  • In-App Viewer for many file formats

  • Features such as voice, conference, chat, file transfer, can be booked separately – e.g. also chat-only is possible

  • User-bound license on any number of devices


NATO Approval – Silentel is the only software-based secure voice / data solution approved for use at NATO members for the use for classified information.

Since 2006, Silentel has been certified RESTRICTED and CONFIDENTIAL by a growing number of national security agencies as a secure mobile communications product.



Silentel is available as an on-premise solution with a wide variety of components and upgrades. They have the entire infrastructure and manage everything themselves.

As a Service by ICSL:

Of course, we have also set up this government solution for you in the same way and have been running the infrastructure for a number of years for our customers, who simply want to communicate securely immediately – across company boundaries.

Silentel as a Service (by ICSL)

Whether company, authority or VIP

You would like to deploy Silentel immediately without having to invest in back-end infrastructure / server?

Start with Silentel as a Service


  • Immediately usable

  • No investment in server

  • No costs for connectivity, manpower, etc.

  • Flexible – from 1 account possible

  • Secure communication with each participant possible

  • Features freely selectable

  • Affordable for everyone!

  • Online also monthly subscription bookable


  • ICSL has built the same Silentel infrastructure as we would otherwise supply to government agencies – in ISO27001 certified data center in Austria, Germany, Switzerland.

  • Also as a service you use a government solution at ICSL – no less.

  • Same structure as usual with authorities on-premise

  • No listening options – for anyone – not even for Sys-Adminis.

  • That makes a full-fledged authority solution!

  • Self-administration of accounts possible anyway

  • Secure voice-to-data communication with anyone on the system

Silentel on-Premise

Would you like to manage the Silentel Government solution yourself?

ICSL gladly offers you an on-premise solution.


  • On your servers in your data center.

  • Completely under your control.

  • Simplest administration.


  • On virtual servers or on dedicated servers

  • Full scalability / distributed installation

  • HA installation possible

  • client capability

  • Individual crypto possible (project)

  • Adjustments / extensions like break-out possible (project)