MiL is struggling to hear her new digital landline phones ringing at home.

Is there a reliable device to extend/amplify the ringing volume?

Or is there a hack I can do to the phones to make them louder? Some way of adding a louder sounder or bell to a phone?

Thank you.

Edit:
Currently looking at something like this. But it says plug into the wall socket. I don't know if that would also work if plugged into the back of the router for her digital phone line.
https://www.connevans.co.uk/product/39533842/40TCALL110/Geemarc-Amplicall-110-Wireless-Telephone-Receiver-and-Transmitter

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