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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