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What is SIP Client?
VoIP/SIP client (softphone) for Windows
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Softphone.Pro - VoIP Softphone for Business
Adore Infotech
SIP Softphone. Download free to call from PC or Mac
Mizutech Wiki > Compare Web SIP client solutions
20 FREE SIP Softphones - VoIP Insider
Zoiper - Free VoIP SIP softphone dialer with voice, video and instant messaging :: Zoiper
20 FREE SIP Softphones - VoIP Insider
VoIP/SIP client (softphone) for Windows
20 FREE SIP Softphones - VoIP Insider
Free SIP Softphone
MicroSIP - lightweight VoIP SIP softphone for Windows - Official Homepage