
You must copy the AJVoIP.aar here (your licensed copy, a trial version or the demo version).
Also make sure that in your build.gradle you declare the libs dependencies like this: implementation fileTree(dir: 'libs', include: ['*.jar','*.aar'])
More help here: https://stackoverflow.com/questions/16682847/how-to-manually-include-external-aar-package-using-gradle-for-android
Optionally copy also the ajvoip-sources.jar file for better inline documentation in your IDE. It might need to be selected from "Choose Sources" if not recognized automatically.

The demo version can be downloaded from here: 
https://www.mizu-voip.com/Portals/0/Files/AJVoIP.zip 




