3CX is recommended for small to medium-sized businesses, enterprises looking to integrate their communication systems, and organizations that need a scalable and flexible telephony solution. It is also suitable for companies wanting to enhance their remote work capabilities with features like web conferencing and mobile app support.
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Asterisk - An open source telephony switching and private branch exchange service for Linux.
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.
freepbx - FreePBX is a web-based open source GUI that controls and manages Asterisk (PBX).
Kamailio - Kamailio® (successor of former OpenSER and SER) is an open source SIP server released under...
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs
FusionPBX - FusionPBX is an open source FreeSWITCH GUI.