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Sorry to hear you’re facing problems 
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Some useful links to gather information about your Nextcloud Talk installation:
Information about Signaling server: /index.php/index.php/settings/admin/talk#signaling_server
Information about TURN server: /index.php/settings/admin/talk#turn_server
Information about STUN server: /index.php/settings/admin/talk#stun_server
Nextcloud version (eg, 24.0.1): 33.0.3
Talk Server version (eg, 14.0.2): 23.0.4
Custom Signaling server configured: no
Custom TURN server configured: yes
Custom STUN server configured: yes
In case the web version of Nextcloud Talk is involved:
Operating system (eg, Windows/Ubuntu/…): debian
Browser name and version (eg, Chrome v101): chromium
In case mobile Nextcloud Talk apps are involved:
Talk iOS version (eg, 14.0.2): replace me
Talk Android version (eg, 14.0.2): 23.0.1
The issue you are facing:
Is this the first time you’ve seen this error? (Y/N):y
Steps to replicate it:
Hi,
On my VPS, with docker, I just installed nextcloud, NPM and coturn, but without signaling.
I tested nextcloud talk app on 2 devices, one ipad, one android.
When android calls ipad, ringing is ok in each way.
When ipad calls android, ringing is ok if talk app in foreground or background.
But if android phone is in screen lock, there’s no ringing or anything.
I’ve given talk app all permissions, including notifications, background all activities, background wakeup, Lock screen display, power saving mode off, etc.
Then I tested a method from this forum: send a text right before audio call. When android receives the text, there’s a push sound, and sometimes screen lights up, sometimes does not. And it does not help the following audio call. A push sound is better than nothing, but I still hope there is a ring tone and let me click accept call.
Any idea? please enlighten me.