baresip+

This application implements a secure and fully open source VoIP User Agent based on baresip library. Its development is motivated by need for a secure, privacy focused SIP user agent for Android that does not depend on third party push notification services.

Currently baresip+ app supports voice/video calling, text messaging, voicemail Message Waiting Indication, as well as blind and attended call transfers. Voice can be codec with Opus, AMR, GSM, G.729, G.726, G.722, G.722.1, and PCMU/PCMA, codecs. Video can be coded with VP9, VP8, H.265, H.264, and AV1 codecs. Security is achieved via TLS or WSS signalling transport and ZRTP or (DTLS) SRTP media encapsulation.

baresip+ app can be installed on Android devices running Android version 7.0 or later. Video calling requires that Android device supports Camera 2 API at hardware support level LEVEL_3. If you don't need video calling, it is recommended that instead of this app you install its sister app baresip.

baresip+ app's privacy policy is available here.

Source code is available at GitHub, where also issues can be reported.