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Textlocal - Textlocal is an app that allows for individual and group texting. It is designed for businesses that have employers and employees who need to communicate with each other, making it easier to announce group meetings and special announcements.
Asterisk - An open source telephony switching and private branch exchange service for Linux.
BulkSMS - SMS messaging service provider offering two-way SMS communication services.
Wazo.io - The UCaaS Platform Built for MSPs
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.