Bigvoize.

Big Voize is a mobile dialer or application which makes VoIP calls with minimum iOS version support of 7.0 on Apple iPhone, iPad, iPod and it uses the 3G/Edge/wifi Internet connectivity.

Big Voize is developed based on the requirements of VoIP Providers business needs.

Features :-
Big Voize uses SIP protocol based for signaling.
Big Voize Supports all codecs.
Big Voize run Behind NAT or private IP.
User Friendly Interface.
Auto Sync of Balance.
Call History.
Loud Speaker.
Address book integration.