sip softphone

VoIP SIP SDK - A powerful and highly versatile VoIP SDK for SIP applications

VoIP SIP SDK with DLL and ActiveX - A highly versatile SDK for SIP applications

VoIP SIP SDK - A powerful and highly versatile VoIP SDK for SIP applications

Avaya IP Softphone

The NEXT way of thinking CTI

Easy to use Free SIP Softphone for voip providers

G729 Plugin codec for RTC Sip softphone

Softphone for PC-telephony using TAPI, CAPI or SIP plus answering machine

Free Softphone for Windows. Works with any SIP/ VOIP provider and SIP PBX

TekSIP is a SIP Registrar and Stateless SIP Proxy for Windows.