Hello & Welcome to Just Answer,
I'm Greg and will do my best to assist with this issue 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'm not finding a "do not disturb" function on this particular model phone, so can you DESCRIBE the SYMPTOMS happening with this function? For example, are you SEEING something on the display(s) of the handset(s) OR are callers HEARING some "announcement" when they try to call you?
2) What landline phone service provider (phone company) you have for this phone line?
Please REPLY using the box below and the SEND button.
*** IMPORTANT NOTE: *** ANY requests for "additional services" (such as a phone call) are OPTIONAL and sent BY THE SITE AUTOMATICALLY (and not me), and I may NOT be available by phone.
Feel free to DECLINE (close) any such offers, and continue in this text/chat form.