Enabling incoming calls when ringer is off (like emergency repeated incoming ?)Does anyone know how to enable incoming calls when the ringer is off to let emetgency calls ring?

You use Do Not Disturb for that feature, not the mute switch.

• Tap Settings
• Tap Focus
• Tap on any Focus settings that you will never use and remove them (you can add them back later if you change your mind, and even create new, custom ones)
• Tap Do Not Disturb
• Tap People
• Tap Allow Notifications From
• If anyone is listed who should not call you when DND is on delete them; if you don’t want any calls from anyone, any time, delete all people
• Tap the dropdown next to Allow Calls From and choose Allowed People Only
• Optionally, tap on Apps, then Allow Notifications From and don’t add any apps.
• Optionally, turn on Allow Repeated calls to allow calls from people you didn’t include in the Allowed list.

All of the above is a one-time setup. After that, turn DND on or off with a quick tap on the Control Center DND button. You can optionally set one or more schedules by going to:

Settings/Focus/Do Not Disturb/Set a Schedule.