This is very basic Android Studio project implementing baresip
(https://github.com/alfredh/baresip) based SIP User Agent.

Currently supports voice calls and messages with TLS transport,
PCMU/PCMA and opus voice codecs, as well as ZRTP and (DTLS) SRTP media
encapsulation.

The static libraries and include files in distribution directory have
been produced using https://github.com/alfredh/baresip-android.  Use
latest versions of baresip, re, and rem.  Then apply reg.c-patch to
re/src/sipreg/reg.c.  The patch is needed due to re timer sometimes
firing too late.

After cloning the project, in android-studio:

- Open an existing Android Studio project

- File -> Invalidate Caches / Restart -> Invalidate & Restart

Now available also in Google Play store.

Feedback welcome.