your gonna have to provide more info to get help : what (phone) are you running this on. what version of cordova are you using...
Verify your Cordova-Android platform version with this command: cordova platform version android
This is weird because it's not the app that puts the icon there and makes the sound... but BTW if your using the power management plugin also you'll have to use the "localnotification" plugin to make the notifications... You did not mention this but its just an example that other plugins and your general app-setup might f*ckup the push notifications.. sop the more info you provide the more help you'll be able to get.