GitHub - ipphone/core: IP Phone – lightweight SIP softphone for Windows
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Adore SIP Softphone is advanced VoIP Application and it changed Communication Technique – AdoreSoftphone
VoIP/SIP client (softphone) for Windows
Mizutech Wiki > Compare Web SIP client solutions
VoIP Softphone for windows
Zoiper - Free VoIP SIP softphone dialer with voice, video and instant messaging :: Zoiper