Ozeki MediaGateway SIP example to develop a Silverlight VoIP softphone in .Net. The sample program is based on Ozeki VoIP SIP SDK that provides stable background. It allows to make SIP voice and video calls, to develop own softphone, IVR applications, Silverlight/Flash text/voice/video chat programs, supports web-to-web voice and video calls, SIP DTMF signaling, browser to browser calls, javascript call management, auto and predictive dialer, etc. The sample program demonstrates the communication between two Silverlight clients via a SIP PBX; or communication between a Silverlight client and a SIP telephone/softphone. The point is that the SIP telephone or softphone also needs to be registered on the same SIP PBX or can be called with connection. The Silverlight clients that connected to the server will register to the SIP PBX specified on the server side with a SIP account selected by the server. In this sample program, the server is responsible for keeping connection with the SIP PBX, and also for setting up/accepting calls, hanging up calls, forwarding media data between the PBX/SIP device and the Silverlight client and distributing accounts that are required for logging into the PBX. The server also makes these accounts logged into the PBX for the Silverlight clients. Ozeki VoIP SIP SDK has been developed to ensure excellent sound quality. For this purpose various codecs are supported: G.711 aLaw/uLaw, G.729, iLBC, GSM, G.722, SPEEX, SPEEX-WB. To make/receive VoIP phone calls, the WPF softphone is compatible with almost all PBX systems like Asterisk PBX, Cisco UCM, 3CX Phone System, Kamailio PBX, etc. Ozeki SIP SDK also works with almost all VoIP service providers (Skype Connect, Gafachi, Callcentric, SureVoIP, VoIPtalk, 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

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