Free VOIP / SIP phone (softphone) for Windows. Use your PC as a phone. Works with popular VOIP providers and SIP PBX's (including 3CX Phone System). Easy to use & light weight. Full version, not a lite version! Free download from http://www.3cx.com
Get your free VOIP Solution software with answering machine with free voicemail account. No charges, no strings, completely free phone number you can give out as your own. You get free voice mail answering machine included for free too!
VoIP SDK - A simple way to VoIP-enable your applications and websites. The conaito VoIP SDK contains a high performance VoIP conferencing client capable of delivering crystal clear sound even for both low and high-bandwidth users.
VaxTele SIP Server SDK allows software vendors and service providers to develop their own SIP based VoIP Server, IP-PBX, SIP PBX, SIP gateway and IP-Telephony services.
VoIP EVO SDK - A simple way to VoIP-enable your applications and websites. The conaito VoIP EVO SDK contains a high performance VoIP conferencing client capable of delivering crystal clear sound even for both low and high-bandwidth users.
Billion Softswitch VoIP SIP/H323 proxy server for Windows, Linux, FreeBSD. Billion Softswitch is a software system for intellectual proxy of signaling and media streams in the VoIP-networks based on SIP and H.323 protocols.
Video VoIP SIP SDK is a solution to quickly build VoIP softphone that can dial and receive audio and video calls on your computer or add VoIP features into your software or web website.