VaxVoIP Server SDK - Build Windows SIP servers, IP-PBX, IVR and call centers

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Build your own Windows VoIP platform with VaxVoIP Server SDK. Add SIP registration, call routing, IVR, conferencing, recording and call-center features, with multi-core processing and SIP threat detection. Includes C#, VB.NET, Visual C++ and Delphi sample projects and a fully functional 30-day trial.

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We built VaxVoIP Server SDK for developers who want to create their own branded SIP server, IP-PBX, IVR, auto-dialer or call-center software for Windows.

The SDK provides SIP registration, call routing, conferencing, call recording and PBX features, alongside multi-core processing and events for detecting SIP scanning, flooding and brute-force activity. You control your application interface, business logic and deployment, whether on-premises, in a data center or in your chosen cloud.

A fully functional 30-day trial includes demo applications, documentation and sample projects in C#, VB.NET, Visual C++ and Delphi. Commercial licensing is available after evaluation.

We would love feedback on API usability, documentation and sample code, call quality and performance, and the PBX or call-center features you need most. What would you build with it?