VoIP SIP SDK for Android

ABTO Software VoIP SIP SDK for Android allows to build a custom SIP softphone for Android 2.3.x, 4.x, 5, 6, 7, and 8 (Oreo) with support of voice and video calls.

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

Operating System:

  • Windows
  • Mac OS
  • Linux

Development environments:

  • Eclipse
  • Android Studio

Trial SDK:


  • Android 2.3.x, 4.x, 5, 6, 7, and 8 (Oreo)
  • Support of SIP and RTP
  • UDP/TCP support
  • MWI support
  • secure connection via SRTP and ZRTP;
  • STUN and other IETF standards (compatible with SER, OpenSER and Asterisk)
  • ICE support
  • SIP Registrar (SIP server) support
  • Audio and video calls
  • Single line support
  • DTMF
  • Status messages
  • User Agent name support
  • SIP port change
  • Available SIP port check
  • Bluetooth support
  • Second registration
  • Different networks support (WiFi, GPRS, 3G, EDGE)
  • Registration proxy support
  • Log support

Available codecs:

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

End User Features:

  • Set a custom ringtone
  • Use softphone with no registration (useful for calls in local network)
  • Communicate via IM chat
  • Check Call history
  • Store and use Contacts list
  • Play File to conversation
  • Put a call on Hold
  • Record a Call
  • Send DTMF (useful for calls to call center)
  • Enable/disable Video, Microphone and Speaker during the call

Download trial