I and going to assume you are on a traditional PSTN line and not DV ( digital voice ) where the phone plugs into the broadband router .
FYI , ringtone is the sound the person making the call hears in their handset , waiting for the called number to be answered , not the ‘ringing’ the called number phone makes responding to an incoming call .
I presume you mean the called phone doesn’t ‘ring’ ( make a noise ) but the person making the call hears ‘ringtone ‘, something to try , call your landline number from your mobile , while listening to ringtone on the mobile ( presumably the landline phone will not be making a ringing noise ) answer the landline anyway….does the call connect and can you can hold a conversation between the mobile and landline ? if the call connects, first check the landline phone isn’t faulty or had the bell/ringer turned off , if confident that the phone is OK , there is a fairly common fault , where the exchange doesn’t send the ringing current down the line to signal to the phone that there is an incoming call, it’s an exchange line card issue.
Report this to your phone line provider as ‘bell not ringing’ , although they will probably send an Openreach tech , it’s actually an ‘exchange’ engineer that’s required , but if you explain the issue , the OR tech should be able to fix this , by moving your ‘line’ from the faulty line card onto a different fault free line card in the exchange , or by passing the fault to BT TSO /BTwholesale or whatever the division that looks after the exchange equipment is now called , to replace the faulty line card.
If this doesn’t work , dial 17070 from your landline just to be sure the number that is read back to you is your number
