Hi Timbothy,
Thanks for your post and apologies to hear you're having an issue with the ringer on your handset.
It's worth checking the handset itself to ensure the ringer is on. If you have a digital handset then make sure the volume is turned up too.
If this is already the case, try a replace handset to see if this makes any difference. If again this makes no difference then it could be an issue with the power coming from the cabinet.
Let me know the results from the above steps and if you are still having issues, we can book an engineer for you 🙂
Thanks,