The server is
with you.
Silentel in your own infrastructure: your hardware, your network, your control. NATO-approved — and ready to use in around two weeks. From turnkey standard installations to bespoke solutions with ICSL.
On-Premise means the server is at your site, running on your hardware, under your full control. ICSL builds the infrastructure, trains your team and hands over operations to the extent you choose.
Your data have
only one home: yours.
All data reside on your hardware, in your network — no external connection required. No metadata outside your infrastructure, no reliance on third-party uptime.
The level of security states trust.
Silentel is NATO-approved and NIAPC-listed. ICSL has deployed the technology with governments and defence agencies since 2013 — fully air-gapped on request, without any internet connection.
Updates happen
when your IT allows them.
Your IT department controls updates. No external server access, no third-party dependency — your infrastructure belongs to you.
We build it.
Your team takes over.
ICSL builds the infrastructure on site, trains your technical team in independent operations and maintenance, and hands over complete operational documentation. Optional remote support — you decide the scope.
Four Configurations — From Standard to Bespoke.
Depending on security requirements and infrastructure, ICSL offers On-Premise in different configurations — from turnkey standard installations to fully bespoke solutions for governments and the military.
Silentel On-Prem Standard
Turnkey installation on your hardware. Pre-configured, tested and ready for immediate use.
- ✓ Hardware requirements: standard server (recommended by ICSL)
- ✓ On-site setup by ICSL technical specialists
- ✓ Ready in approximately 10–14 working days
- ✓ Remote support from ICSL included
Silentel On-Prem Custom
Configuration tailored to your organisation's specific infrastructure or network requirements.
- ✓ Segmented network configuration
- ✓ Individual SLA agreements
Silentel National Certified
For use under national or NATO security classifications — with the corresponding approval documentation.
- ✓ NATO RESTRICTED / SECRET compatible
- ✓ Complete approval documentation
- ✓ NIAPC-listed
- ✓ Air-gapped operation possible (no internet access)
- ✓ Installation by security-vetted ICSL personnel
Silentel Individual
Fully tailored to specialist requirements — custom hardware, unusual network topologies and proprietary integrations.
- ✓ Custom Hardware / Hardened Devices
- ✓ Proprietary network integration
- ✓ Own Brand: your own branding, GUI & cryptography on request
- ✓ Long-term partnership with ICSL
- ✓ On request — priced according to the work required
Maximum control. Zero external dependencies.
On-Premise means the server is at your site, running on your hardware, under your full control.
Complete Data Sovereignty
All data on your hardware, in your network — no external connection required.
NATO Approval Level
Silentel is NATO-approved. ICSL has served governments and defence agencies since 2013.
Air-Gap Capable
Can operate entirely without an internet connection — for isolated, highly sensitive environments.
No Third-Party Dependency
No cloud provider, no platform operator, no supply chain risk. Your infrastructure belongs to you.
Operational in Approximately 2 Weeks
ICSL builds the infrastructure on site — typically 10–14 working days to live operation.
Training Your Technical Team
ICSL trains your IT staff to operate and maintain the infrastructure independently.
What ICSL Delivers During Installation
ICSL handles the complete setup — from hardware recommendations to the first encrypted call on your system.
- On-site survey & infrastructure analysis
- Hardware specification and procurement support
- Silentel server installation & configuration
- Network integration (firewall, VPN, segmentation)
- Administration interface for user & device management
- Onboarding & training for your administrators
- Complete operational documentation
- Optional remote support agreement with ICSL
- Annual security audits on request
Silentel On-Premise Custom
- ✓ Server physically within your organisation — no external access
- ✓ No metadata outside your infrastructure
- ✓ No reliance on third-party uptime
- ✓ Your IT department controls updates
Who Is Silentel On-Premise Custom For?
On-Premise is the choice when external dependencies must be excluded — for government, military and critical infrastructure.
Governments & Ministries
The highest classified information protection requirements. Your own infrastructure, your own control, no foreign dependency.
Military & Defence
NATO-approved security level. Air-gapped or closed-network operation. Deployment worldwide.
Intelligence & Security Agencies
Complete isolation, no external connections, installation by security-vetted ICSL personnel.
Critical Infrastructure (KRITIS)
Energy utilities, water suppliers, telecommunications — resilient communications even during an attack.
From Enquiry to Live Operation
ICSL coordinates the entire setup — from initial analysis to an installation ready for handover. Typically 2–4 weeks, depending on complexity.
Security & Requirements Analysis
ICSL analyses your existing infrastructure, security requirements and network topology. The result: a concrete system specification and hardware recommendation.
Hardware Procurement & Preparation
ICSL can assist with procuring certified hardware. The server configuration is prepared and tested in the ICSL laboratory.
On-Site Installation
ICSL technical specialists install and configure the system at your premises: server setup, network integration, administrator access and initial user accounts.
Acceptance, Training & Handover
Joint acceptance testing, administrator training and complete documentation handover. Your team takes over independent operations.
Ongoing Support (Optional)
ICSL offers optional support agreements for remote assistance, updates and annual security audits — you decide the scope.
Maximum Security Begins with a Conversation
On-Premise projects are individual. Describe your needs — ICSL develops the right configuration. Strictly confidential, with no disclosure of customer names.