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Ozeki .NET SDK allows to develop VoIP video softphone to make and receive video calls. This videophone makes it possible to change between the available video devices (web cameras), the video resolution (according to the selected cam abilities) and the transmission codecs. Its GUI includes some basic elements for camera, resolution and codec changing support. Ozeki SIP SDK ensures excellent sound and video quality due to extended codec support. Ozeki VoIP SIP SDK provides support for the basic and some additional video codecs that can be used in video communication and also for capturing and replaying video phoning sessions. This sample shows how to implement video device, video resolution and transmission codec changing using Ozeki VoIP SIP SDK. Once the sample program is started and the GUI is initialized, the available video devices can be set on the GUI. The possible resolution values can also be set for the selected camera device that will be the default camera. It is possible to select any of the supported codecs during runtime, the only important thing is that all the communicating parties need to use the same codecs for communication. Ozeki SIP SDK provides a flexible background for this development this way it allows to further extend the functions and customize your solution. CUSTOMIZABLE FEATURES AND GUI: You can easily customize the features and GUI of the video softphone when you use Ozeki SIP SDK. ON-LINE VOIP SERVICE SUPPORT: Ozeki SIP SDK works with almost all VoIP service providers (Skype Connect, Gafachi, Callcentric, SureVoIP, VoIPtalk, etc) due to that it is fully standard compliant. OUTSTANDING PBX COMPATIBILITY: It is compatible with the most of PBXs such as Cisco UCM, Asterisk PBX, 3CX Phone System, Kamailio, OpenSIPS, SipX ECS, Elastix, etc. Allows to add video phone to your website using Adobe Flash or MS Silverlight: Silverlight to SIP calls, Adobe Flash to SIP calls, Browser to browser calls, Webbrowser to VoIP calls with multiple lines