OnePlus
Enable Repeat Callers in Do Not Disturb Mode auf OnePlus
Do Not Disturb on OnePlus phones silences calls and notifications system-wide, but a few exceptions can still ring through.
Allowing calls from favourites or selected contacts is one option. Repeat callers is a separate mechanism: it checks whether the same phone number calls again within a 15-minute window and treats that as urgent, letting the second call ring even while Do Not Disturb is active.
To change this behavior, open Open the Settings ➔ Tap on Sounds & vibration ➔ Tap on Do Not Disturb ➔ Tap on Calls ➔ Enable or disable Allow repeat callers.
This works well for genuine emergencies, since most people call back quickly when something urgent comes up. The tradeoff is that persistent spam or robocall numbers calling twice in a row also get through. If unwanted repeat calls are the bigger issue for you, keep this option disabled and rely only on the favourites or contact exception instead.
The setting only affects calls, not text messages or app notifications, so muted chats stay silent regardless of how this option is configured.

