I'm using SINCH VOICE for App to App calling. Voice calling works fine when app is in foreground and also in background. when the app is closed state, VoIP push not coming in receiver end or voice call does not come in receiver end. I created VoIP certificate from apple developer account and exported it from keychain and the imported p12 file in Sinch account. I enabled push notification and VoIP in general setting in xcode. Can any one please tell why the VoIP push notification not coming at receiver end?
Sinch VoIP push notification is not coming when app is in Closed state
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This can have multiple reasons, here are the most common ones for you to debug:
Wrong environment:
Mishandling VoIP push notification when App is in background
https://developer.apple.com/videos/play/wwdc2019/707/ https://developer.apple.com/documentation/pushkit/responding_to_voip_notifications_from_pushkit
Your App is blacklisted by APNS
Step 1: Delete your app from the device.
Step 2: Turn the device off completely and turn it back on.
Step 3: Navigate to Settings > General > Date & Time and set the date ahead a day or more.
Step 4: Turn the device off completely again and turn it back on.
Step 5: Re-install your app and open it.
Step 6: Accept push permission request inside your App.
Step 7: Set the device Date and Time back to automatic
Step 8: Restart your device
How to debug from here?
Make sure you test on a device to rule out simulator issues
Turn off Sinch event listener in your Sinch client. This will force your App to entirely rely on VoIP notifications and you will be able to better follow the logic your App takes to report to CallKit and handle the incoming Sinch Call.
When running the app in background check your device log in XCode and check for any error throws regarding CallKit.