• AVST Supports Microsoft Customers
    Transitioning from
    Exchange Online Unified Messaging
  • Industry-Leading UC Interoperability
    Today and Tomorrow's UC Investments
    Across Premise, Cloud and Hybrid
  • Every Industry. Any Size.
    20 Million Users in Action
    35+ Years Delivering Enterprise-Class
    Unified Communications Applications

Innovative Unified Communications Applications for Over 35 Years

Who We Are

AVST is a Trusted Developer of
Enterprise-Class Unified Communications Software

Industry-Leading Interoperability to Future-Proof Today and Tomorrow’s UC Investments

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UC Applications

Voice Messaging

Secure voice messaging for regulated industries

Mobile Client

Advanced mobile client delivering secure voice messaging

Personal Assistant

Speech-enabled, context-aware, enhances first-time call completion

Automated Attendant

Speech-enabled, sophisticated call processing, directories


Accelerate information flow to your customers

Unified Messaging

Unified messaging – Microsoft, Google – premise, cloud, hybrid

Call Center

Cost-effective, informal call center for knowledge workers


Outbound call notification for business process automation


Secure Fax over IP, including Fax mobile client

How We're Different

Best-of-Breed: Transform productivity with AVST’s enterprise-class Unified Communications applications.

Future-Proof: Deploy AVST’s Unified Communications applications with existing infrastructure while maintaining maximum flexibility for future IT decisions – Premise, Cloud or Hybrid.

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Our Products

Our Customers

20+ Million Users Worldwide

AVST and XMedius have joined forces to offer a suite of secure enterprise-grade communications solutions, built for any industry.