sip android application development like : mosip([url removed, login to view])
just like ip to ip calling application . i will give you the sip address for your integration.
10 фрилансеров(-а) подали заявки на эту работу; средняя заявка - $173
we can develop this app. we have developed small voip app. any api required for the work you will provide. and we need to know all functionalities required in the app.