ABTO VoIP SIP Softphone is a demo application that is based on ABTO VoIP SIP SDK for Android, which allows the development of custom SIP softphones. Although the calls are terminated after 1 minute, the application features most of the available functionality of the SDK and is incredibly easy to use, with numerous benefits for end-users.

One of the most notable features of ABTO VoIP SIP Softphone is the ability to make voice and video calls to most SIP clients, with or without registration on the SIP server. The application also includes a contacts list, call history, IM chat, file sharing, and DTMF sending capabilities. Additionally, users can enable/disable video, microphone, and speaker during the call and even use Bluetooth.