4PSA is a leading innovative software development company, specializing in applications that run on computer clouds. The company provides, under the 4PSA brand, solutions that help service providers and enterprises better manage their IT infrastructure, automate processes, and provide improve communications services.

The 4PSA flagship solution is the VoipNow® Platform, a suite of software applications designed to accelerate Unified Communications adoption by businesses and end-users. The products are built around cloud computing and provide unrivaled performance with the most comprehensive features, massive scalability, and the ultimate in automation. 4PSA’s success is based on excellence, innovation, and customer driven processes. The company's business processes are supported by the ISO 9001:2008 quality management system certified by TÜV CERT. 4PSA® and VoipNow® are registered trademarks of Rack-Soft, Inc.