Video call implementation in ionic4


I want to create an ionic 4 video calling app, for this i have implemented TokBox WTC plugin to connected two user. But i have issue in video call connection services. for this i have implemented using OneSignal to send notification then in “handleNotificationReceived()” I will open the a page in my app to mimic incoming call page, but when the app is closed, “handleNotificationReceived()” will not fire. Basically i want to notify user to received video call by ringing phone and user pick that call