Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
VoIP.ms - VoIP.ms is a VoIP origination and termination tool.
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs
Vitelity - Vitelity offers hosted PBX, VoIP, SMS and communication solutions.
Nextiva - Business VoIP, cloud phone systems trusted by more than 150,000 companies. Powered by the leading cloud PBX VoIP platform, Nextiva is rated the best business VoIP service provider.