sip

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

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

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

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

Develop SIP based Web phone with your own GUI and brand.

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

PC-to-Phone, PC-to-Fax, PC-to-PC, Phone-to-PC over Internet, ISDN or SIP

Fax Voip -virtual T38 Fax/Voice/SIP/H.323 modem. Operates with standard fax soft

A Windows based comprehensive and dynamic SIP/VoIP dialer.