CSipSimple

* 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.

keywords : SIP, codecs, voip, GPL, dialer, voice over IP, free softphone, sip softphone, sip phone, telephony, softphone software free, voip phone, softphone sip, pbx