VoIP SIP SDK – Contact Us

Thank you for your decision to share your opinion about our product or request additional information.

  1. (required)
  2. (valid email required)


VoIP SIP SDK support team is waiting for your message

ABTO Software is a company with US sales office and Eastern Europe based development center. Our employees develop, sell, and provide technological support for our VoIP SIP SDK solutions for different platforms including Windows, Android, and iPhone. You can contact us to receive consulting regarding VoIP solutions, request more information about our products or estimation for a custom software solution.

If you have any questions or requests regarding the softphone solutions, please contact our Customer Service Representative by calling at 1-773-800-2875, sending us e-mail to or using our contact form.

In order to communicate regarding purchasing our software solution, please send us e-mail to

Please check our FAQ and blog before sending technical questions. We regularly check our e-mail so you will receive our reply within 24 hours.


Development Environments:

  • Visual C++ / C++ / C# .NET
  • VB.NET / VB 6.0
  • Java
  • JavaScript / HTML / HTML5
  • Flash
  • Borland Delphi

Company details:

ABTO Software is the only owner and distributor of VoIP SIP SDK. The company also develops other products and offers software development services. Read more on