Based on React Native and ReactNativePJSIP

$ git clone https://github.com/tariq86/rn-sip-app
$ cd rn-sip-app

$ npm install

If you want to fix the yellow warnings that pop up when first opening the app, you'll need to perform the following module edits in XCode:

1. In the Project Navigator, open Libraries > RNCallKit.xcodeproj > RNCallKit > RNCallKit.m
2. Add the following code right after the close of the (instancetype)init function closing bracket (around line 52):

+ (BOOL)requiresMainQueueSetup
{
   return NO;
}

To run on Android, you can run either npm run android (recommended) or react-native run-android from the project root directory.

To run on iOS, you can call either npm run ios (recommended) or react-native run-ios from the project root directory.