Currently, H.323 and Session Initiation Protocol (SIP) are the two most commonly used Voice-over-IP (VoIP) signaling protocols. SIP offers faster feature development than H.323, in part because SIP standards are controlled by the IETF, while H.323 standards are published by the ITU. Many extensions to the SIP protocol have recently been approved, and more are in the process of being standardized. dynamicsoft developed one of the first commercial SIP signaling stacks
damicsoft sold its SIP SDK as object libraries and as source code in support of application developers in the VoIP industry. dynamicsoft's customers typically built upon these protocol software components to develop new voice services or applications. Two variations of the dynamicsoft SIP stack were offerred: A C++ SIP protocol stack that was available as either binary or source code, and a Java SIP protocol stack. Each stack provided a feature-rich SIP software library but each was targeted to a different end of the application development spectrum.
The dynamicsoft SIP stack was the industry’s leading SIP protocol stack. Available in Java or C++ versions, this SIP stack offered carrier-class performance and unprecedented functionality to manage the fundamental connection between the call-originating and call-terminating parties. The dynamicsoft SIP stack had earned its reputation as the most scalable, robust and flexible SIP protocol stack then available. Network equipment providers have deployed the dynamicsoft SIP SDK to SIP-enable a broad array of both communications services and devices — including softswitches, media gateways, media and feature servers and IP phones. dynamicsoft's, multi-layered API (application programming interface) made it easy to build simple applications as well as complex implementations. As the most basic component of a SIP network, the dynamicsoft SIP stack was the essential tool that service providers and network equipment providers used to create new communications services and to enhance existing applications with the power of SIP.