Whether available immediately as a service, hosted or entirely within your infrastructure — ICSL finds the model that fits your security requirements, IT and timeline.
All three options use the same highly secure Silentel core — the difference is operational responsibility and control.
No backend of your own. No IT team. ICSL operates a government solution for you — available anonymously, active the same day.
Your own Silentel server, fully operated by ICSL in a high-security data centre.
Complete data sovereignty on your own infrastructure. NATO-approved. Deployed in 2 weeks — also as a bespoke solution.
| Criterion | as-a-Service Premium | Hosted / Cloud | On-Premise Custom |
|---|---|---|---|
| Operated by | ICSL — independent premium operations | ICSL (dedicated) | Your own IT team |
| Data storage location | ICSL Vienna | Choice of location (Vienna, DE, FI …) | Your own servers |
| Time to go live | Same day | 5–10 working days | Approximately 2 weeks |
| In-house IT required | No | No | Yes |
| Post-Quantum Crypto | ✓ | ✓ | ✓ |
| Available Anonymously | ✓ | — | — |
| Suitable for | Executives, VIPs, businesses, backup | Government agencies, businesses, critical infrastructure | Government, military, critical infrastructure |
Every function is end-to-end encrypted and leaves no data traces on the device. Identical across all deployment models.
Device-to-device encrypted calls — as easy to use as a normal phone call: add participants, mute, speakerphone, Bluetooth hands-free.
Group calls with automatic speaker identification and a live participant list showing who is present and who is speaking. Leave and rejoin at any time.
Push-to-talk as used by police and emergency services — the microphone is active only while the button is pressed; an external PTT button can be connected.
Secure video conferences on iOS/Mac, Android and Windows — including screen and app sharing.
Only sender and recipient can read them. With delivery and receipt details, plus expiry: messages delete themselves after a defined period.
Send documents, images and any other files encrypted. Capture photos, video and audio directly in the app without leaving the secure environment.
A dedicated, centrally managed contact list, strictly separate from the phone's address book. Completely deleted when the app closes — with presence status and an “on a call” indicator.
Granular group privileges: the group administrator determines who may use which functions, down to individual members.
Missed calls and new messages are announced by standard SMS — no content, just the notification.
Silentel Operator Studio gives you independence: manage users, permissions and functions yourself — or let ICSL handle them for you.
The cryptographic parameters used exceed the approved requirements for Top Secret (CNSA). In addition, post-quantum cryptography (FIPS 203, 204, 205) is fully implemented as an additional encryption layer over all communications.
All deployment models serve the same purpose — secure communications when it really matters.
NATO-approved solutions for classified use. Deployed in government agencies, armed forces and ministries for over 20 years.
Find out more →Operational continuity even during a cyberattack. Independent communications for energy utilities, financial institutions and emergency teams.
Find out more →Discreet, easy to use, fully supported by ICSL — no backend of your own, no IT overhead, maximum privacy.
Find out more →ICSL advises you confidentially, free of charge and without obligation. Usually within 24h.
