RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
MyOperator - MyOperator is a cloud-based call management system for voice communication purposes.
3CX - Hosted PBX with CRM integration and mobile apps
Asterisk - An open source telephony switching and private branch exchange service for Linux.
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.