FreeSWITCH
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Scalable open source cross-platform telephony platform.
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Asterisk
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Easy to use but advanced IP PBX system, VoIP gateway and conference server.
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Kamailio
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Modular SIP server (registrar/proxy/router/etc).
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openSIPS
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SIP proxy/server for voice, video, IM, presence and any other SIP extensions.
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Flexisip
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Complete, modular and scalable SIP server, includes a push gateway, to deliver SIP incoming calls or text m…
CDocker