Voip Mobile Client App for Android and IOS

Project Scooping My initial Scooping. We are a community based ISP, in order to broaden and add value to our user experience, we are looking to develop VOIP client app in both iOS and Android platform, that our subscribers can use to use to make Voip Calls. The mobile apps to be developed over Asterisk open source Private Branch Exchange platform. We have already developed the server side technology with the Asterisk platform, and will need someone to help would develop the necessary APIs to be required for the mobile apps. The mobile apps need to communicate with the server using the SIP and IAX protocols. Developer will be responsible and would be to develop fully functional native mobile apps on both iOS and Android platforms. Developer would develop the UI/UX, pages and the API integrations and help also with the setting up of the server side. And would also help the us to publish the apps on respective app stores for beta and live, for this we would give necessary permissions to the respective app store accounts. There will be following applications developed:  A iOS app with Swift v5.0  An Android app with latest XCODE The iOS & Android app will have the following screens/features:  Contact list to display contact name with phone number/extension number  Contact search functionality  Add contact screen  Phone screen  Dial pad screen  Hold, Transfer, Mute, Speaker, conference, recording feature  Settings screen  SIP settings & accounts display  IAX settings & accounts display  Call receive  Messaging functionality  Call history page  Play back of previous call recording  Conference screen displaying multiple users and limit  Video call  Call over 3G/4G/WiFi  Native contact import & display