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VoIP User Agent app for Android based on baresip SIP library
This is a bare-bones baresip based SIP User Agent application for Android. Currently the application supports voice calling and messaging, UDP, TCP, and TLS signaling transports, voicemail Message Waiting Indication, incoming call transfers (REFER), PCMU/PCMA, iLBC, G.726, G.722, G.722.1, AMR, and Opus voice codecs, as well as ZRTP and (DTLS) SRTP media encapsulation. Motivated by need for a secure SIP user agent for Android that does not depend on third party push notification services. If you need video calling and have a device with Android version 7.0 or newer that supports Camera2 API at level FULL or LEVEL3, you can instead of this application install its sister application baresip+.