Parity Software Development Corporation was founded in 1989, with the first release of VOS, a powerful computer telephony application language. Through the 90s the product was developed and enhanced, becoming a truly formidable force in the IVR application development arena. It was now possible to make powerful IVR applications based on Dialogic voice processing hardware without having to resort to complex coding in C. The scripting language was easy to learn and use, and a multitasking engine took care of running the application on multiple lines.

In 1999 Intel acquired Dialogic Corporation and Parity Software, meaning it now owned the hardware and software used around the world for creation of IVR applications and services.

I experimented with VOS 5.4 in the mid 90s and used VOS 6 in earnest whilst working at Jersey Telecoms. See my IVR History for details. With the advent of VOS 7, a new engine was introduced. The Topaz engine provides a layer of abstraction that separates the call flow from the underlying technology in use, be it analog lines or primary rate ISDN. I succcessfully completed a number of projects written under the Topaz framework.

As part of Intel's rebranding, VOS is now known as CT-ADE - the Computer Telephony Applications Development Environment.