We are looking for someone capable to brand and compile SIP dialer (Android, IOS, PC) like this one: [login to view URL] I think the best choice would be basing on Linphone code. The most important feature is ofcourse calling, phonebook should be divided to onnet and offnet contacts (onnet user list available over API).
Onnet users should also be able to chat with one another, signup (new users - api available) and check tariff rates (API), Service is hosted on VoipSwitch platform. We can provide all needed technical information or create additional - dedicated API for easy development.
We prefer someone who already has such released in porfolio.