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Ozeki VoIP SIP .Net SDK for C# DTMF IVR system development to add automatic voice response to your telecommunication system. The sample program allows the caller to navigate in a voice menu with the help of the keypad of the telephone to reach the target me. The sample program registers/unregisters to the PBX, handles calls events, connects the PBX and the dialed party, conciliates audio codecs of the participants, implements voice communication. The IVR system ensures 24/7 customer support. Introducing DTMF IVR into any corporate system can take a lot of burden from the shoulder of the support department. The caller can simply navigate to the desired option by pressing the buttons of the traditional phone set. The introduction of DTMF IVR functionality based on Ozeki VoIP SIP SDK will improve any corporate communication to a high extent. This will result a great amount of phone calls with satisfied callers. A multichannel IVR server which accepts calls and plays back wav audio also can be built with Ozeki VoIP SIP SDK. Besides the DTMF IVR function Ozeki VoIP SIP SDK offers other versatile functions not just for companies but also for individual .Net developers as well. Ozeki VoIP SIP SDK can be integrated into any software which was developed in .Net because it is a pure .Net solution. This also means continuous development for creating better and better solutions with outstanding support. Voice communication is an essential part of developing and implementing an own DTMF IVR system so Ozeki VoIP SIP SDK is capable to deliver crystal clear sound. Because of the extended codec support it supports G.711 aLaw/uLaw, G.729, iLBC, GSM, G.722, SPEEX, SPEEX-WB. Many PBX systems are supported including Asterisk PBX, Cisco Unified CM etc. After an Ozeki SIP SDK .Net license has been purchased you can feely use the license with your product and may freely distribute your product in as many copies as you want and no royalties or license fees are needed to be paid for Ozeki