VoIP SIP Server SDK provides a powerful and highly customizable API solution based on the Session Initiation Protocol (SIP) to quickly add SIP based server features to your application or to build new one from scratch. It accelerates the development of Session Initiation Protocol compliant server (registrar) with a fully-customizable user interface and brand name. This SIP API contains a high performance SIP conferencing Server 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. SIP Server SDK in company with our client VoIP SIP Software Development Kit will give you a solution that support DTMF, adaptive silence detection, adaptive jitter buffer. Also using our voice conversation SIP API you can work through firewall or NAT. Our product is based on IETF standards (Session Initiation Protocol, STUN, etc.), so it should be compatible with other standard based products such as Asterisk, OpenSER other. The software has the following features: # Registrar # Highly customizable # SIP client authentication # PC to Phone call services. # PC to PC call services. # VPN support # DTMF support # specific optimizations to offer high performances # Samples on Delphi, C#, VB, VB.NET, C++ 2005, C++ 6.0 # Windowless samples on C++ and .NET # Royalty free licensing # No Yearly/Monthly fe