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VoIP User Agent app for Android based on baresip SIP library
Currently baresip VoIP User Agent app supports SIP voice calls and messages, voicemail Message Waiting Indication (MWI), and incoming call transfers via REFER method. Voice can be coded using PCMU/PCMA, Opus, G.722.1, and iLBC codecs. Security is achieved via TLS signaling transport and ZRTP and (DTLS) SRTP media encapsulation. Development of this baresip app is motivated by need for a secure libre software SIP User Agent for Android that does not depend on proprietary, third party push notification services. Source code available at https://github.com/juha-h/baresip-studio, where issues can be reported.