Lots of high pitched beeps coming from wall box. Is this normal?
What Wall Box, an ONT, NTE, DSL Modem?
Are you sure it’s coming from said wall box and not your Smoke Alarm as the Beep to indicate a Low Battery.
Has your ONT got a battery backup unit in it? it's like a UPS but just for the ONT and I think Beeping can indicate a fault with the battery backup unit like dead batteries. Honestly the backup is p useless and openreach don't even support them properly anymore so I'd just bypass it if that's the case.
-Jade
The Battery Back Up’s Openreach used to supply don’t Beep to indicate a low or faulty battery. It would just indicate a problem with a, Fault Light.