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Blink, OSX, Linux, and Windows
(Free and open-source license) (Clients) -
Issabel, fork of Elastix
(Free and open-source license) (Servers) -
Sipdroid for Android, GPL v3
(Free and open-source license) (Mobile clients) -
Audiocodes Mediant (Session border controllers)
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pfSense, a firewall/router distribution based on FreeBSD and PF; has QoS that properly tags VoIP traffic and a SIP proxy package that is available for NATed endpoints. Its functionality can be expanded with packages like FreeSWITCH, a free/open source software communications platform for making SIP, voice and chat driven products. (Enabled firewalls)
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Snom One free/blue/yellow (Snom acquired and renamed pbxnsip) (SIP)
(Proprietary license) (Servers)
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