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Asterisk - An open source telephony switching and private branch exchange service for Linux.
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
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.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
FusionPBX - FusionPBX is an open source FreeSWITCH GUI.
Better Uptime - We call you when your website goes down