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Ozeki VoIP SIP .Net SDK for developing C# voice recognition IVR program 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 telephone keypad and allows to recognize mentioned keywords during the conversation. It registers/unregisters to PBX, handles calls events (incoming and outgoing calls, disconnection, etc), connects the PBX and the dialed party, conciliates audio codecs of participants, implements voice communication. The voice recognition IVR example is easy to use so the usage of Ozeki VoIP SIP SDK is not only recommended for IT professionals but for all who want to be familiar with .Net and VoIP technology. Ozeki VoIP SIP SDK offers more significant solutions like multichannel IVR server (accepting calls and playing back wav audio) building, navigation in the IVR tree using DTMF commands, navigation in the IVR tree using Voice recognition, automated information query solutions (IVR database integration), IVR to live operator transfer and take back (IVR human cooperation). The following functions are not included in the sample program but there is a possibility to implement them with Ozeki SIP SDK: "Go back" function in the IVR menu, dynamic menu system, custom menu system, call forward function, Windows service based IVR. Ozeki VoIP SIP SDK can be easily integrated into any program which was developed in .Net because it is a true .Net solution. Ozeki VoIP SIP SDK has supreme audio features like adaptive jitter buffer, narrow band and wide-band voice codec choice: G711A, G711U, iLBC, Speex, Speex-wb, GSM, G.729. Compatible with almost all PBX systems like Asterisk PBX, Cisco UCM, 3CX Phone System, Kamailio PBX, etc. Ozeki SDK works with almost all VoIP service provider. An Ozeki SIP SDK license can be purchased then freely used with your product and you can distribute your product freely in as many copies you want without paying royalties or license fees to Ozeki

Ozeki VoIP SIP .NET SDK allows to develop SDP manipulator to set any SDP field information. The program provides two methods, one for sending and one for receiving SDP messages. Ozeki SIP SDK ensures all the background so SDP handling will not bother you at all while programming. The example program has a simple GUI with tabs that indicate the certain functionalities of the application. The SDP manipulation can be done on the second tab labeled with "Custom SDP Message". You can manipulate both incoming and outgoing SDP messages. If you want to manipulate SDP or SIP messages during the phone calls, you need to set message manipulators for the softphone. In order to manipulate an outgoing SDP message, you need to set the outgoing message you want to send and press the Apply button below the textbox. Working with incoming SDP messages is just the same. You type in the modified message and press the apply button below the proper textbox. This namespace contains the basic classes and tools that are to provide the SDP support in Ozeki VoIP SIP SDK. It defines an interface, two classes and an Enum type that is for defining the mode of communication. Ozeki SIP SDK offers various products and possibilities: Softphone, VoIP client applications: Dialers, Call assistant, Call center clients, Call center servers, PBX systems, IVR systems, Webphone solutions, Conferencing systems, Voice recording systems, VoIP tunneling systems, Security monitoring systems, Mobile communication systems. Tools: SIP protocol implementation, RTP implementation, RTCP implementation, Audio device support (mic, speaker), Audio encoding / decoding (audio codecs), Voice quality improvement tools (AEC, AVG, NR, Jitter buffer), Video device support (camera and playback), Video encoding / decoding (video codecs), Implemented network communication protocols: UDP, TCP, Implemented firewall passthrough (STUN, TURN), Implemented file formats (mp3, wav, avi). Capacity: multiple lines and calls are also ensured

Ozeki VoIP SIP .NET SDK allows to develop Silverlight SIP softphone to make web to SIP calls. The program demonstrates a web page embedded softphone with the use of Silverlight technology. The sample program is based on Ozeki VoIP SIP SDK that provides stable background. It allows to make SIP voice/video calls, to develop own softphone, IVR applications, Silverlight/Flash text/voice/video chat programs, supports web-to-web voice and video calls. This sample program shows how to implement a fully functional Silverlight softphone client-server application that can be embedded into your web page. Its GUI has all the features that a fully featured softphone application has to support voice calls, so it has a keypad and some notification labels and, of course, a textbox that shows the dialed number. It has the basic telephone functions so it can register or unregister to/from a SIP PBX. The phoneLine is created with the SIP account the client gets from the server and it must be registered to the state change event. The softphone object also has to be registered to the incoming call event in order to be able to notice an incoming call. The last step is to register the phone line to the softphone. This establishes the PXB registration. The server functionality is implemented in the SIPGateway class that contains some new properties to handle the softphone functionalities and the SIP accounts. The server can write some information or notification on the console window then it initializes the basic properties. In this sample the server will generate 18 different SIP accounts that can be registered with a cycle instruction. When the softphone is created, the SoftPhoneFactory class sets the main settings of the PBX. Ozeki VoIP SIP SDK ensures extended codec support. It is compatible with most SIP PBXs (like 3CX, Asterisk, etc.). It works with most online VoIP service providers (like Skype Connect). It provides multiple call and line support; and offer royalty free licensing