How to build a bell indicator with flashing LED and reset?

Hello, is there any circuit that would signal if the doorbell was switched on? - a sort of mini-signal that would let you know if someone has rung the doorbell in the flat.
The way I see it: when the doorbell switch is pressed, a circuit with a flashing LED (in the flat) is switched on - which tells the entering householder that there has been a visitor while they were away. This signalling could be reset by the householder (extinguish the diode) - which would light up again the next time the entrance bell is switched on. I kindly ask for suggestions.

Nice idea, but I don't know of such a ready-made device. You probably have to make one yourself. It shouldn't be complicated - some kind of latch, a flip-flop...?

Once upon a time... an incoming signal to a telephone exchange triggered an electromagnet which let go a metal flap - you could see which subscriber wanted to talk...

A number with a tin would even be immune to power outages....

And seriously, even a 555 cube can work as a flip-flop - example:


The diagram is from http://www.dummies.com/how-to/content/electronics-components-the-555-in-bistable-flipflo.html

This can be done using the simplest relay control system with what is known as a "hold".
Is this a private house or a townhouse. If a townhouse, where is the power taken from - the premises or the adm? What voltage is the bell on?

The bell works on 230V - powered from a private flat. Can you post a diagram of this circuit with a description of how it works?

The diode must not be flashing if this is to operate on 230VAC.
When the bell button is pressed, the energised relay short-circuits its contacts causing power to be maintained for itself until the circuit is broken by the reset button. The only disadvantage is that if a bell is connected to the coil of the relay, it will ring until the reset button is pressed.
This can be eliminated by adding an additional relay or rectifier diodes.

Arrangement on two relays