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Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
MicroSIP - MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack.
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.
Phoner - Softphone for VoIP, CAPI und TAPI.
3CX Phone System - 3CXPhone is a free VoIP phone available for Windows, iPhone or any Android based smart phone such...
Asterisk - An open source telephony switching and private branch exchange service for Linux.