The following scenario at one of our customers:

Due to a defect, the customer's T-Com telephone system has been kicked out and the router now manages the telephony itself.

There is an old bell in the workshop that is connected via a/b and rings when a call is received.

Unfortunately, the router sends too little juice via the analog connection, so that the bell only makes very little sound. For reasons of nostalgia, however, the customer wants to keep the thing and continue using it.

Question: Have any of you had a similar case and do you know of any amplifiers that could be used to amplify the signal?

Thank you for your help!