توضیحات:

Callingbell is a highly beneficial mobile application for end users who are required to make frequent long distance or international calls. With right VoIP services, the mobile application can save big money for end users. It is available on android. The mobile application is very easy to use with some fantastic features on offering. For ensuring crystal clear voice quality,android leverages noise and echo cancellation technology.
What you get?
Seamless voice calling experience
SIP softswitch compatibility
NAT traversal on Private IP
Low bandwidth consumption
G729, PCMU, PCMA codecs
Address book integration
To explore more features, download android on your favorite device today!