SIP 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 based soft phone with your own GUI (graphical user interface) and brand name. SIP SDK includes SIP activeX , SIP OCX , SIP DLL , SIP Lib and SIP Cab, so you can use the one you like the most. It is really easy to incorporate SIP SDK in your web pages and/or applications. Sample source codes are available to download. It delivers superior voice quality by integrating advanced digital voice processing features including acoustic echo cancellation, noise cancellation and adaptive jitter buffering. For more details, please visit the features link. VoIP SIP SDK is a powerful VOIP SIP SDK solution to quickly build voip softphone to dial and receive phone calls or add voip chat features in your software application. VOIP SIP SDK allows to make voip calls for multiple lines. VoIP SIP SDK contains a high performance Voip conferencing client capable of delivering crystal clear sound even for both low and high-bandwidth users and SIP compatible devices (hardware and software). It enables a worldwide communication over the internet or intranet networks delivering superior voice quality. It supports DTMF, adaptive silence detection, adaptive jitter buffer! Voip SIP SDK is based on IETF standards (SIP, STUN, etc.).