FreeSWITCH - FreeSWITCH is an open-source media application designed to support popular protools such as SIP and WebRTC and provides a platform to develop voice and video applications.
Broadvoice - Cloud PBX solution for SMBs
freepbx - FreePBX is a web-based open source GUI that controls and manages Asterisk (PBX).
Genesys Cloud - As the foundation of great customer experience, the Genesys PureCloud contact center platform empowers your business to provide excellent service across the entire customer journey.
Asterisk - An open source telephony switching and private branch exchange service for Linux.
CallFire - Grow your business with virtual phone numbers, IVR, voice broadcasting, mass text messaging services and power dialing.