Update README with VoIP terminology and new features

Added information about mobile calling support in recent baresip versions and clarified VoIP terminology.
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juha-h
2026-05-15 07:37:54 +03:00
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This is a bare-bones Android Studio project implementing <a href="https://github.com/alfredh/baresip">baresip</a> based SIP User Agent for Android. 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 the application supports voice calling and messaging, voice conference calls, UDP, TCP, TLS, and WSS signaling transports, voicemail Message Waiting Indication, call transfers (REFER), AMR, Codec2, G.722, G.722.1, G.729, Opus, and PCMU/PCMA voice codecs, as well as ZRTP and (DTLS) SRTP media encapsulation. Minimum supported Android version is 9 (API level 28).
Currently the application supports VoIP calling and messaging, VoIP conference calls, UDP, TCP, TLS, and WSS signaling transports, voicemail Message Waiting Indication, call transfers (REFER), AMR, Codec2, G.722, G.722.1, G.729, Opus, and PCMU/PCMA voice codecs, as well as ZRTP and (DTLS) SRTP media encapsulation. Minimum supported Android version is 9 (API level 28).
Recent versions of baresip also support mobile callig when baresip selected as the default phone app in Android settings. This is possible when Android version is 10 or higher.
If you need video calling and have a device that supports Camera2 API, you can instead of this application install its sister application baresip+ from video branch.