Call notification not working

Steps to reproduce

1. in a private chat a user starts a call with you
2. no call sound, not even notification that someone is calling you
3. open a chat, you see user started a call with you a couple of seconds ago

NOTE: iOS client receives notifications normally. if you call from android client to iOS client, the iOS client will receive call notifcation
Android -> iOS ( works )
Android -> Android (doesn't work)
iOS -> Android ( doesn't work )

Expected behaviour

1. should receive a call sound, the ringtone should play
2. should receive a pop-up notification, that someone is calling

NOTE: iOS client receives notifications normally. if you call from android client to iOS client, the iOS client will receive call notifcation
Android -> iOS ( works )
Android -> Android (doesn't work)
iOS -> Android ( doesn't work )

Actual behaviour

1. in a private chat a user starts a call with you
2. no call sound, not even notification that someone is calling you
3. open a chat, you see user started a call with you a couple of seconds ago

NOTE: iOS client receives notifications normally. if you call from android client to iOS client, the iOS client will receive call notifcation
Android -> iOS ( works )
Android -> Android (doesn't work)
iOS -> Android ( doesn't work )

Device brand and model

Samsung Galaxy S21, Samsun Galaxy A8

Android version

13, 9

Nextcloud Talk app version

17.1.3

Nextcloud server version

27.1.3

Talk version

17.1.3

Custom Signaling server configured

None

Custom TURN server configured

None

Custom STUN server configured

None

Android logs

No response

Server log

No response

Additional information

No response

Start by reproducing a private call notification on the listed Samsung devices and Android versions, comparing Android-to-Android, iOS-to-Android, and Android-to-iOS calls. Inspect the Android call notification and ringtone handling; done means Android recipients receive both the ringtone and pop-up notification consistently.