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Asterisk - An open source telephony switching and private branch exchange service for Linux.
Twilio - Brings voice and messaging to your web and mobile applications.
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.
Plivo - Plivo simplifies your customer engagement.
Wazo.io - The UCaaS Platform Built for MSPs
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates