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  1. MicroSIP - lightweight VoIP SIP softphone for Windows - Official …

  2. Top Free SIP Apps for Windows - Lifewire

  3. TOP 5 Free SIP Softphones - IPComms

  4. Zoiper - Free VoIP SIP softphone dialer with voice, video and …

  5. MicroSIP Download Free - 3.21.5 - TechSpot

  6. MicroSIP online help

  7. VoIP Softphone for windows

  8. 9 Open Source Free SIP and Softphone clients - MEDevel.com

  9. TekPhone (SIP Softphone for Windows) - KaplanSoft

  10. Classic softphone for Windows - mizu-voip.com

  11. 某些结果已被删除