I have a BT Decor 2600 landline telephone. When there is an incoming telephone call a red light flashes but there is no ringing sound. Why is this please? How can I get the ringing sound please?

Bing AI, when asked the above, gave the following reply.

If your BT Decor 2600 landline telephone is not ringing but the red light is flashing when there’s an incoming call, it could be due to a few reasons:

Ringer Volume: Make sure the ringer volume on your phone is not turned down or switched off1.
Phone Line Cord: Make sure you are using the phone line cord that you received in the box with the phone1.
Power Adapter: Check both ends of the power adapter are plugged in and secure1.
Broadband Interference: If you’ve got broadband, you may need to use a microfilter to stop the broadband interfering with your phone service1.
Link to Base: If your cordless phone display flashes “Searching”, “Base” or “Range out” it has lost its link to the base. You need to move it closer to the base so that it is back in range1.
Reset Phone and Base: Reset both the phone and the base to change the settings back to the factory default1.
Master Socket: If you have your phone plugged into an extension, try it in the master socket instead1.
Do Not Disturb Function: Some phones have a “Do Not Disturb” function. Check it isn’t switched on1.
Blocked Numbers: Some phones let you block certain numbers. Check that you’ve not blocked a specific number from calling that you now want to call1.
If none of these solutions work, you might want to try dialing *234#, which turns on the ringer if necessary2. If you’re still having problems, it might be best to contact BT for further assistance1. I hope this helps!