How to Develop VoIP and Video Calling Applications with Ozeki VoIP SIP SDK 9 2 0
Ozeki VoIP SIP SDK 9 2 0 is a powerful and easy-to-use software development kit that allows you to create voice over IP (VoIP) and real-time video calling applications in C#.Net. With this SDK, you can make and receive calls, transfer calls, handle DTMF signals, use various codecs, and more. You can also integrate your applications with any SIP compatible PBX system or VoIP service provider.
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In this article, we will show you how to get started with Ozeki VoIP SIP SDK 9 2 0 and how to create a simple softphone application that can make and receive calls. We will also show you how to add video support to your application and how to customize the user interface with WPF.
Getting Started with Ozeki VoIP SIP SDK 9 2 0
To use Ozeki VoIP SIP SDK 9 2 0, you need to have the following requirements:
A .Net compatible development environment, such as Visual Studio
.Net Framework 3.5 SP1 or higher
A SIP account or a SIP PBX system
A microphone and a speaker for audio calls
A webcam for video calls (optional)
You can download Ozeki VoIP SIP SDK 9 2 0 from the official website[^1^]. The SDK comes with an installer that will install the necessary components and libraries on your computer. You can also download the source code of the SDK and the sample applications from the website.
After installing the SDK, you can open Visual Studio and create a new C# WPF project. To use the SDK in your project, you need to add references to the following DLL files:
Ozeki.Common.dll
Ozeki.Media.dll
Ozeki.VoIP.dll
Ozeki.VoIP.SDK.dll
Ozeki.VoIP.SIP.SDK.dll
Ozeki.VoIP.Video.SDK.dll (optional)
You can find these DLL files in the installation folder of the SDK, usually C:\\Program Files\\Ozeki\\Ozeki SDK\\bin.
Creating a Simple Softphone Application
To create a simple softphone application that can make and receive calls, you need to follow these steps:
Create a user interface with WPF that contains buttons for dialing, hanging up, registering, and unregistering. You can also add text boxes for displaying the caller ID, the dialed number, and the call state.
Create an instance of the SoftPhone class that represents a SIP client. You can use the CreateSoftPhone method of the SoftPhoneFactory class to do this. You need to specify the local IP address and port number of your computer as parameters.
Create an instance of the SIPAccount class that represents your SIP account or PBX extension. You need to specify your username, password, domain name, and display name as parameters.
Create an instance of the PhoneLine class that represents a phone line associated with your SIP account. You need to pass your SoftPhone and SIPAccount instances as parameters.
Register event handlers for the IncomingCall, RegistrationSucceeded, and RegistrationFailed events of your SoftPhone instance. These events will notify you when there is an incoming call, when your registration is successful or failed.
Register event handlers for the CallStateChanged, DtmfReceived, and DtmfStarted events of your PhoneLine instance. These events will notify you when the state of your call changes, when you receive or send DTMF signals.
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