Vkoll app for iPhone and iPad

Vkoll is the leading mobile VoIP application. The mobile application allows end users to make long distance or international calls at low rates. It is available on iOS. To ensure crystal clear voice quality, Vkoll leverages inbuilt noise and echo cancellation technology. End users can save big money when combined with the right VoIP services. Also, the intuitive UI and many easy-to-use features of the application will continue to offer a delightful user experience for end users.
Key Features:
NAT traversal on Private IP
Address book integration
SIP signaling
SIP softswitch compatibility
G729, PCMU, PCMA codecs