What is CSipSimple?
csipsimple will allow native sip for android device.
It relies on the pjsip SIP stack and use the pjsip-jni project.
The use of this native library will ensure a better speed, call quality and less battery consumption than equivalent pure java projects.
Another point is that this project will be compatible with most of SIP registrar and take advantage of the active development of the pjsip C stack.
The project is discontinued. The app wasn't updated since November 30, 2014.
Comments and Reviews
Said about CSipSimple as an alternative
CSipSimple works fine with a UK Sipgate account and have had no reason to use anything else. Bad news is, it only works with Android phones.