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freepbx - FreePBX is a web-based open source GUI that controls and manages Asterisk (PBX).
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.
Maytapi - Serverless Whatsapp Api with Chat and Agent support.
Asterisk - An open source telephony switching and private branch exchange service for Linux.
Swift SMS Gateway - SMS Gateway is your bridge between the Internet and the world of cell phone SMS text messaging.