Sipring

Features:
* Faster Registration
* Echo Cancellation
* Easy contact searching
* Manage Call logs
* DTMF feature
* Loud and clear voice
* Call hold, mute, loudspeaker
* Consuming low internet
* Consume less battery charge
* Works in VoIP blockades
* Supports IP PBX
* Connectivity through WIFI/3G
* Call ongoing on background
* Balance information
* Time, call status