Welcome to IPWorks VoIP, a developer suite providing straightforward access to secure telecommunication operations using industry-standard protocols, such as Session Initiation Protocol (SIP), Session Description Protocol (SDP), and Real-time Transport Protocol (RTP) to initiate, establish, and maintain communication sessions. Implement a software-based phone using the IPPhone component, with many features of a traditional telephone, or design an Interactive Voice Response (IVR) menu using the IVR component, which allows for automation and full control over designing and customizing menu options.

Included Libraries

The .NET Edition includes libraries (.dll files) which are supported in different environments. The following libraries are present in the lib directory after installation:

  • lib\net40\nsoftware.IPWorksVoIP.dll is designed for use in .NET Framework 4.0 and up. This library maintains a familiar API in line with previous versions of the product.

  • lib\net6.0\nsoftware.IPWorksVoIP.dll is designed for use in .NET 6 and up. The .NET 6 library provides cross-platform support while maintaining the same API as the .NET Framework version of the library.

    Support for asynchronous programming patterns (async/await) is exposed in a separate nsoftware.async.IPWorksVoIP namespace. See the Async Functionality page for details.

Included Components

CertMgrThe CertMgr component is used to create, read, and manage certificates.
IPPhoneThe IPPhone component can be used to implement a software-based phone.
IVRThe IVR component can be used to implement an Interactive Voice Response (IVR) menu.

Additional Information

You will always find the latest information about IPWorks VoIP at our web site: We offer free, fully-functional 30-day trials for all of our products, and our technical support staff are happy to answer any questions you may have during your evaluation.

Please direct all technical questions to To help support technicians assist you as quickly as possible, please provide a detailed and accurate description of your problem, the results you expected, and the results that you received while using our product. For questions about licensing and pricing, and all other general inquiries, please contact

Thank You!

Thank you for choosing IPWorks VoIP for your development needs. We realize that you have a choice among development tools, and that by choosing us you are counting on us to be a key component in your business. We work around the clock to provide you with ongoing enhancements, support, and innovative products; and we will always do our best to exceed your expectations!