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ICSL – Secure Communications
Secure immediately!
Silentel as-a-Service Premium — available immediately Silentel Hosted / Cloud Silentel On-Premise Custom Compare all deployment models · Features & Functions
What we do
Secure Voice, Messaging & Data Communications Deployment, Setup & Managed Environments Crisis Backup as-a-Service Live Drone Streaming in the Messenger Quantum-Resistant Communications Custom Devices — Bespoke Endpoints Testing & Evaluation Training & Support
Who is it for?
Executive & VIP Government & Military Critical Infrastructure & Businesses Communicate Anonymously and Securely Crisis Communications & Backup
Why ICSL?
Neutrality for Our Customers We examine the details ICSL — since 1995 Discretion & Principles Approvals & Clearances Solutions that work
ICSL Consulting ↗
ICSL Secure Communications · Contact

Let's talk

Confidential · direct · without intermediaries. No forms routed through call centres — your first contact is a senior manager or senior technical specialist.

How to Reach Us

ICSL provides advice on enquiry. When you contact us, we handle it discreetly.

Direct Contact Options

Email (preferred)
office@icsl.at
Telephone (Vienna office)
+43 1 33286 80300
Address
ICSL GmbH
Khunngasse 14, 1030 Vienna, Austria
Availability
Mon–Fri, 09:00–17:00
Outside these hours: by email, response within 24h

Support & Existing Customers

Customer Support Portal
support.icsl.at ↗
Discretion is standard. ICSL does not name customers or cite endorsements without express permission, and records enquiries internally only. All contacts are subject to professional confidentiality.

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