VoIP SIP SDK for iPhone

ABTO Software VoIP SIP SDK for iPhone and iPad will you help you to quickly build a custom softphone app for iOS.

Here you can have a look at our video clip that demostrates main functionality of the SDK’s sample softphone:

Operating System:

  • Mac OS.

Development environments:

  • VOIP SIP SDK for iPhone on objective-C (Xcode);
  • VOIP SIP SDK for iPhone on Swift.

iOS versions:

  • VoIP SIP SDK for iOS 5;
  • VoIP SIP SDK for iOS 6;
  • VoIP SIP SDK for iOS 7;
  • VoIP SIP SDK for iOS 8.


  • supports 64 bit architecture;
  • SIP/RTP support;
  • STUN and other IETF standards (compatible with SER, OpenSER and Asterisk);
  • SIP Registrar (SIP server) – including Asterisk and ABTO Software SIP Server;
  • voice and video calls;
  • status messages;
  • work in background mode;
  • secure connection via SRTP and ZRTP;
  • changing camera orientation;
  • switching between multiple cameras.

Available codecs:

  • H.263
  • H.263+
  • H.264
  • G.711-ALaw
  • G.711-muLaw
  • G.729
  • Speex
  • Theora
  • GSM


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.