VoIP SIP SDK is a sip soft phone solution to quickly build voip softphone to dial and receive phone calls or add voip chat features in your software application.

VoIP SDK provides a powerful and highly customizable solution (SDK includes such features: SIP activeX control, Dynamically loadable codecs, DTMF, STUN support, IM interface, T38 modem support, Fax, RTP SDK, Bluetooth Support, Adaptive silence detection and many more) to quickly add SIP based dial and receive phone calls (to make a long story short - voip client) features in your software applications. It accelerates the development of SIP compliant softphone with a fully-customizable user interface and brand name.

The VoIP soft phone 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 soft phone. It supports DTMF, adaptive silence detection, adaptive jitter buffer! Also using our voice conversation sip api sdk you can work through firewall or NAT.

Voip sdk is based on IETF standards (SIP, STUN, etc.), so it should be compatible with other standard based products such as Asterisk, OpenSER other.

Please check Features page for more details about our voice internet phone sdk. Also you can download latest evaluation version on our Download page (evaluation version includes VoIP C++, VoIP Delphi, Sip ActiveX, C# and other languages examples, so you can see our sip dll in work).