Hello & Welcome to Just Answer,
I'm Greg and will do my best to assist you today.
Sorry I didn't see your question earlier and to hear of any issue you are having with your phones.
To help you with this issue, may I ask:
1) I noticed that this is a "link-to-cell" model, so have ANY cell phones been connected (paired) to this system?
2) Do you want the ringers to be turned OFF during a specific time, or just until you (manually) turn them back on?