CSipSimple apk content rating is Everyone and can be downloaded and installed on android devices supporting 4 api and above.
"OpenSource (GPL) project for SIP on Android.
* High performances * Rewriting/filtering rules for integration with Android * SIP SIMPLE for Messaging * Record calls * Simple configuration * Fancy UI inspired from 4.x Holo theme * Many codecs (HD codecs, optimized codecs) * Supported crypto : TLS for SIP and SRTP/ZRTP for media * Themes
More codecs (as the experimental Opus) and themes are available in plugins !
About permission required by CSipSimple : http://code.google.com/p/csipsimple/wiki/PermissionsUse
Please report your bugs to the bug tracker of the project : it helps us to make a better software !!! Users make the apps : It's opensource ! This application is distributed under GPLv3 license terms (http://www.gnu.org/licenses/gpl-3.0.txt). You can also try the development version (nightly builds) available on the project website if you experiment problems with this version.