$799.00 - Research Lab Inc

Embedded Windows CE VOIP Developers Kit is your embedded telephony solution for developing software/ hardware to enable device to device phone calls using SIP/ H323 phone right at the electronics level.
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Free - 3CX Ltd

3CX Phone System Free edition is a SIP based IP PBX. Scaleable, eliminates phone wiring and lowers call costs via VOIP providers. Developed for Windows - Easy to install and configure! Download FREE edition with no limitations or time outs.
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Free - NCH Swift Sound Software

Express Talk is software that works like a telephone to let you make calls from your PC. With Express Talk you can call anyone on the internet who has installed Express Talk (or any other SIP voip softphone). Calls are free.
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$1500.00 - VaxSoft Inc

VaxVoIP SIP SDK provides tools and components to quickly add SIP (Session Initiation Protocol) based IP-Telephony make and receive phone calls feature in your web pages and software applications. You can easily develope net-to-phone apps & web pa
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