I want to make free calls to mobile phones in other countries.

You should consider buying sip service from one of the providers. ABTO Software offers a solution to build sip client that can be used with such sip account.


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 www.abtosoftware.com.