The notification "The call service is ready" is hardcoded in our React Native and Flutter SDKs.
Please refer to the corresponding documentation:
React Native SDK - Video Calling | React Native SDK | QuickBlox
Flutter SDK - Video Calling | Flutter SDK | QuickBlox
There is an ability to change the text of the notification for both SDKs in the following file on GitHub: /android/src/main/res/values/strings.xml.
Additionally, you can change the logo by replacing the files ic_call_service_large.png and ic_call_service_small.png in the following folder on GitHub:
Feel free to check our official documentation for more information that will help you to integrate QuickBlox services into your applications / projects or contact our Support team by submitting a ticket if you have any other questions.