Vixy
Vixy is a soft phone or dialer to make VoIP call from the mobile phone.
Voifinity is a leading solution provider company mainly focused on mobile application development. With this application, you can seamlessly use SIP calling service offered by Voice Pundit.
All you need is a Voice Pundit account.
Phone book integration
Call log information on screen
Excellent sound quality
* requires IOS 4.3+