Ozeki VoIP SIP SDK provides a first-rate technology for softphone development. Instead of wasting time for long development process on your own, you can take advantage on this decent software development kit. You will see how easy it is to create a softphone when you use Ozeki SIP SDK. A basic programming knowledge is enough, since Ozeki SIP SDK provides the base for the VoIP solution you are working on.

VaxVoIP SIP Phone SDK provides tools and components to quickly add SIP (Session Initiation Protocol) based dial and receive phone calls feature in your web pages and software applications. It accelerates the development of SIP softphone, webphone and web dialer having your own GUI (graphical user interface) and brand name. VaxVoIP SIP SDK also provides sip tunneling server software that makes your VaxVoIP SDK integrated softphone and webphone work in VoIP/SIP blocked countries.