VoiceXML Gateway for SIP based VOIP service, traditional PSTN phone services, and Skype. TAPI development API for interactive telephony application. High level development platform based on W3C VoiceXML. Supports text-to-speech, voice recognition, DTMF tones for both inbound, outbound apps. Works with SIP based VOIP services, Skype, and traditional phone services. Voicent Voice XML gateway API , SDK, tutorial, sample code available online. Free download at http://www.voicent.com/download. Developer can integrate Voicent Gateway easily with http web interface, command line interface. Samples are available in C++, Perl, and PHP languages. Applications such as Auto Dialers, phone alert software, and inbound IVR systems can be created without using TAPI programming. Supports text-to-speech, voice recognition, DTMF tones for both inbound and outbound apps. An open source based web server is included but not required. Voicent Developer SDK is also available for commercial developers. A command line simulator is included in the SDK to accelerate development process. Voicent provides developer network annual subscription and support. Includes multi-phone line support. A must have SDK toolkit for Voice XML and telephony application developers.