RKVoiz

RKVoiz is a mobile dialer or application which makes Internet calls with Apple iPhones uses 3G/Edge/wifi Internet connectivity.

Features
RKVoiz uses SIP protocol based for signaling.
RKVoiz Supports all codecs.
RKVoiz run Behind NAT or private IP.
User Friendly Interface.
Real Time Sip status messages.
Call History.
Loud Speaker.
Address book integration.
Compatible with all sip standard switches.