Linphone is a free voice over IP (VoIP) service and SIP client. Developed by Belledonne Communications
License: Open Source
Empathy is designed for ease of use and offers a user-friendly experience for video and audio calls, while Linphone is an open-source alternative that supports multiple protocols and emphasizes security and customization. While Empathy is ideal for casual users seeking simplicity, Linphone caters to users who require advanced features and flexibility.