SIP Library

A simple VoIP library that supports common SIP and IVR operations. Create advanced CTI applications for both individual and conference call solutions.

Red Carpet Subscription Vol. 2 2024 - What's New

IPWorks VoIP 2024 Is Now Available! Providing streamlined call recording and playback, attended transfer, custom menus, conferencing, noise suppression, and many other features [learn more].

SIP Library

VoIP Components

IPWorks VoIP provides SIP and IVR components designed to facilitate common VoIP operations in your CTI applications. Quickly integrate functionality to establish outgoing calls, accept incoming calls, and route calls based on your custom IVR menus. Additional SIP features such as text-to-speech, playing pre-recorded messages, call recording, and inbound call transfers (either blind or attended). IPWorks VoIP also supports conference calls, with functions such as List, Join, Leave, Mute, and others available. IPWorks VoIP is compatible with both on-premises SIP servers and hosted SIP providers.

Whether your telephony needs are simple or complex, IPWorks VoIP is an ideal toolkit for building CTI applications, including automated notification services, dial-for-information numbers, and customer self-service.

Intuitive API

Make and receive calls with only a few lines of code. The API is designed with simplicity in mind.

Standard Softphone Features

Full support for common operations including Call, Answer, Hangup, Hold, Blind Transfer, Attended Transfer, and more.


Existing text can be easily converted and played during a call. Playback of .wav files is also supported.

Conferencing Support

Easily manage conferencing with simple operations to List, Join, and Leave conferences.

Create IVR Menus

Create custom IVR menus and route calls to pre-recorded messages or other inbound destinations.

Uniform & Extensible Design

Very easy to use, with a uniform, intuitive, and extensible design. Common component interfaces across platforms and technologies.

Red Carpet Vol. 2 2024 Now Available

IPWorks 2024, SecureBlackbox 2024, Cloud Identity, DTLS, and more

The 2024 release of IPWorks, SecureBlackbox and more brings all-new capabilities and across-the-board enhancements to authentication, encryption, and performance. IPWorks features a new DTLS toolkit, a new CardDAV component, and more. SecureBlackbox sees major enhancements to PDF & XML signing. And we are pleased to introduce Cloud Identity, a simple, new toolkit for building SSO capabilities into web apps.

All new updates and components are available as part of the Red Carpet Subscription. Download IPWorks VoIP or read the update highlights.

Product Features

  • All standard softphone features including Call, Answer, Hangup, Hold, Blind Transfer and Consultation Hold (Attended Transfer).
  • Text-to-speech support.
  • Communications secured with SIPS (SIP over SSL/TLS).
  • Conferencing and recording of calls.
  • A complete unified framework with a common, easy-to-learn object model and simplified interfaces enable you to do more.
  • List and select available microphones and speakers.
  • Playback .wav files from within a call.
  • Create interactive menus and route inbound calls.
  • Advanced noise suppression.
  • Components are thread-safe on critical members.
  • Fast, robust, reliable components that consume minimal resources.
  • Native development components for all supported platforms and technologies.
  • Rigorously tested, rock solid libraries that have undergone hundreds of thousands of hours of testing both internally by our QA team and externally through customer installations.
  • Detailed reference documentation, sample applications, fully-indexed help files, and an extensive online knowledge base.
  • Backed by multi-tier professional support, including free email support and enterprise-level paid support.

Supported Platforms


Managed .NET Components

Fully-managed .NET components. The edition of choice for fully-managed .NET applications.

  • Managed .NET components built atop our high-performance shared codebase.
  • .NET Standard 2.0 and 2.1 support.
  • Support for .NET 7, .NET 6, .NET 5, .NET Core 3.1, and earlier.
  • Comprehensive integrated product documentation.
  • Seamless integration with Visual Studio.
  • Support for .NET Framework 2.0 - 4.8.
  • Extensive demo applications written in C#.


C++ Class Libraries (Windows)

C++ classes packaged in 32-bit & 64-bit Windows DLLs. The edition of choice for C++ programming.

  • 32-bit & 64-bit C++ class libraries (Windows DLLs).
  • Static libraries for additional deployment options.
  • Extensive console demo applications.
  • Comprehensive documentation.
  • Seamless integration with popular development environments including Microsoft Visual C++.


Delphi VCL Components

Native Delphi VCL components with no external dependencies. It features the same trustworthy components that come with other editions, available as native Delphi VCLs for real Delphi performance.

  • Native Delphi VCL components.
  • Extensive Delphi demo applications.
  • Comprehensive integrated product documentation.
  • Support for all Delphi versions between Delphi 6 and RAD Studio 12.

C++ Builder

C++ Builder VCL's

Native C++ Builder components, written in C++ and compiled with the C++ Builder compiler for blazing performance. The natural choice for C++ Builder programming.

C++ Builder
  • Native C++ Builder components.
  • Extensive C++ Builder sample applications.
  • Comprehensive integrated product documentation.
  • x86 and x64 platform support.
  • Support for all C++ Builder versions between C++ Builder 2009 and RAD Studio 12.


Python modules (Windows)

Python modules for Windows available for use in Python 3.

  • Python modules for Windows.
  • Support for Python 3.
  • Extensive console sample applications.
  • Easy installation using PIP.
  • Comprehensive documentation.


Qt Class Libraries for Windows

High-performance Qt classes packaged in 32-bit & 64-bit Windows DLLs. The edition of choice for Qt development.

  • 32-bit & 64-bit C++ class libraries (Windows DLLs).
  • Support for Qt 4.8 and Qt 5.
  • Seamless integration with Qt Creator.

Components for VoIP

The following components are included in IPWorks VoIP. Please note that due to platform limitations, not all components are available in all editions.

Included Samples

The following sample projects are installed with the product. Please download the trial to get started.

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IPWorks VoIP includes everything needed to add VoIP to any application - on any platform or development technology.