My mother has a Doro 311c telephone and it has stopped ringing audibly. As she is partially sighted this is proving a real problem for her. I can’t see anything that she may have inadvertently switched off but hopefully it’s an easy solution
Any chance your mother turned off or minimized the ringer?
Try to increase the ring volume.
Key/setting Melody type Ringer volume
1 ...............................Melody A ..............Low
2 ...............................Melody A ..............Normal
3 ...............................Melody A ..............High
4 ...............................Melody B ..............Low
5 ...............................Melody B ..............Normal
6 (factory setting)......Melody B ..............High
7 ...............................Melody C ..............Low
8 ...............................Melody C ..............Normal
9 ...............................Melody C ..............High
0 ...............................Off * ......................-