3CX Phone System FREE edition is a SIP-based IP PBX developed for Windows. Easy to install & configure, scalable, eliminates phone wiring & allows hot desking. Lowers call costs via VOIP providers & eliminates vendor lockin. Download FREE
SIP Phone DLL - A powerful and highly versatile VoIP SDK. Our SIP Phone DLL provides a powerful and highly versatile solution to add quickly SIP (Session Initiation Protocol) based dial and receive phone calls features in your software applications.
Vphonet is a SIP based VoIP soft phone that offers free calling between computers and low-cost calling to regular telephones. Video conferences, video e-malis, calls forwarding, voice mail, SMS worldwilde, file transfer, chat are also available.
