PCS & ESI Partnership

Our purpose is to contribute to our customers' success by making it easy to communicate!

• Deliver products and services that are intuitive and easy to use.
• Practice "Success with Significance."
• Enjoy a fit, friendly and fun work and life style.
• Encourage growth through employee and family education.
• Provide an exceptional customer experience.

ESI has a number of U.S. Patents, either granted or pending, on our products’ unique designs and capabilities. Our innovative products use significantly less hardware, resulting in increased reliability. Due to our diversity of products and additional features, we provide significant benefits and greater long-term customer satisfaction. Our patents that have been granted include:

• 6,067,349 and 7,221,741 - Dialing using Caller ID.
• 6,252,944 - Telephone call/voice processing system
• 6,842,505 - Communications system enhanced with human presence-seeking capabilities
• 6,925,167 - Service observing in a voice over IP telephone system
• 6,940,962 - Dial-on-hold
• 7,068,684 - Quality of service in a voice over IP telephone system
• 7,123,699 - Voice mail in a voice over IP telephone system
• 7,466,696 - Services convergence among heterogeneous wired and wireless networks
• 7,564,834 - Shared knowledge in a telephone system
• 7,916,651 - Services convergence among heterogeneous wired and wireless networks
• 8,249,590 - System, method, and apparatus for voice handoffs
• 8,391,298 - Phone directory in a voice over IP telephone system