VoIP: Answering a call on Web does not stop ringing on iOS

[ismailgulek]

Sometimes answering a call on Web (or another platform probably) does not stop ringing on iOS. Probably related to #4018.

Details: https://github.com/matrix-org/element-ios-rageshakes/issues/8116

[JaspreetiOSDev]

I am facing same issue while answering call from iOS and on the web end continuous ringing. Any update on this?

• First Kill the app
• Screen locked
• Receive call and accept
• Ringing on web and showing accepted on iOS End.

[ismailgulek]

A new flow for this:

2021-08-31 09:16:27.098 Riot[50437:9479859]  [PushNotificationService] launchBackgroundSync
2021-08-31 09:16:27.098 Riot[50437:9479859]  [MXKAccount] cannot start background Sync (invalid state 3)
2021-08-31 09:16:27.098 Riot[50437:9479859]  [PushNotificationService] launchBackgroundSync: the background sync failed. Error: kMXKAccountErrorDomain (0).