BVoIP - BVoIP allows to easily add Cloud & On-Premise VoIP PBX to the product offering without having to re-invent the wheel or add another layer to the daily operations..
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Windstream Holdings - Windstream Holdings is a scalable cloud-based business phone solution that provides complete and unified communication applications to businesses of all sizes.
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
OnSIP - OnSIP offers cloud phone sytem for business communications across all devices.
Phonebooth - Phonebooth is one of the leading voip providers, providing phone systems & phone service for small businesses.