RingCentral provides a cloud based business phone system designed for today's mobile and distributed business world. Headquartered in San Mateo, Calif., the company has 320,000+ business customers and is privately held with backing from venture capital firms and Cisco.

Ring Central has great feature sets included with their Hosted VoIP offerings that are not seen anywhere else. SMS from UC client, Fax to email, and faxing out of the UC client, base pricing includes video conferencing and desktop collaboration.

Mite Connect is a national company (Mitel). Their mission is to provide phone systems and applications with an experience that businesses love.

They are redefine what a business phone system can do by offering a wide range of solutions for all types of businesses. Users have full control to engage and collaborate, no matter the time, place or device and to critical business applications for the lowest cost and demand on IT resources in the industry.

8×8, Inc. empowers business conversations for more than 33,000 small and medium-sized businesses with cloud communications services that include hosted PBX telephony, unified communications, call center software and video conferencing solutions. They have been delivering business communications services since 2004 and has garnered a reputation for technical excellence and outstanding reliability.

In 2012, 8×8 was named a market “leader” in Gartner’s Magic Quadrant for Unified Communications as a Service (UCaaS) in North America and was recognized as the No. 1 Provider of Hosted IP Telephony by Frost & Sullivan and Synergy Research Group.

Nextiva is more than just a cloud-based phone service provider. We’re dedicated to helping you run your business efficiently and profitably – from anywhere, anytime. With over 90,000 Hosted VoIP customers Nextiva is the fastest growing Hosted VoIP company in the world. Nextiva has unique and affordable hosted pricing plans not seen anywhere else.

Nextiva has different ways of billing for hosted VoIP which sometimes make it an excellent fit. Instead of only charging on a per seat basis, a company with many sites can sometimes pay per line use while still reaping the benefits of hosted solutions.

inContact offers a strong portfolio of cloud-based call center solutions enabling organizations to operate more efficiently and profitably.

inContact is the leading provider of hosted or ‘cloud-based’ software solutions for call centers. The software is categorized into two primary areas: 1) contact routing and 2) agent optimization. Additionally, inContact can offer network connectivity for customers that prefer to get everything from a single source.

One of if not the best Cloud based Contact Centers on the market.

Thinking Phone Networks delivers unified communications services from the cloud which can transform the way distributed enterprises collaborate, streamline business processes, and respond to customers.

Cloud Based UC – Fully managed (including the network) or "Bring your own MPLS" We combine a powerful business analytics engine whose Key Performance Indicator (KPI) summaries of communications and operational data provide executive level visibility into customer interactions, operational efficiency, and overall business health. Open platform- The ThinkingSuite ecosystem is an open architected platform that includes an extensive library of Web services APIs and connectors to facilitate third-party application integration.

CallTower, Inc. is the leading provider of hosted enterprise-class unified communications solutions for growing organizations nationwide.

They enhance clients’ strategic and business operational capabilities by integrating business phone service, mobile applications, email hosting, unified messaging, instant messaging, audio, web and video conferencing, collaboration tools, contact center, cloud services and global networks into a single platform.