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VoIP SIP SDK is a softphone sdk solution to quickly build voip softphone to dial and receive phone calls features in your software application. VoIP SIP SDK provides a powerful and highly customizable solution (including SIP activeX) to quickly add SIP based dial and receive phone calls features in your software applications. It accelerates the development of Voip compliant softphone with a fully-customizable user interface and brand name. The softphone 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 intern networks either by speaking and delivers superior voice quality by voip phone. It supports DTMF, adaptive silence detection, adaptive jitter buffer! Voip sdk is based on IETF standards (STUN, etc.), so it should be compatible with other standard based products such as Asterisk, OpenSER other.