Awesome

Lumicall is an open-source SIP / ENUM client for Android

<img src="https://f-droid.org/badge/get-it-on.png" alt="Get it on F-Droid" height="60"> <a href="https://play.google.com/store/apps/details?id=org.lumicall.android"><img src="https://play.google.com/intl/en_us/badges/images/generic/en_badge_web_generic.png" height="60"></a>

Building:

To build this code, please see the instructions here: http://www.lumicall.org/source-code-and-build-instructions

Licence:

Copyright (C) 2012-2017 Daniel Pocock (http://danielpocock.com)
Copyright (C) 2017 Urvika Gola (urvika.gola@gmail.com) Copyright (C) 2017 Bruno Magalhães (bfmags@gmail.com) Copyright (C) 2017 Juliana Louback (juliana.m.louback@gmail.com) Copyright (C) 2016 Pranav Jain contact@pranavjain.me Copyright (C) 2009 The Sipdroid Open Source Project (http://sipdroid.org)
Copyright (C) 2008 Hughes Systique Corporation, USA (http://hsc.com)
Copyright (C) 2006 The Android Open Source Project (http://android.com)
Copyright (C) 2005 Luca Veltri - University of Parma - Italy (http://mjsip.org)

Licensed under the GPL v3 - see LICENSE.TXT

Lumicall has been supported by Google Summer of Code and Outreachy.