OK - if EVERYTHING is disconnect from ALL phone jacks in your home - even in living spaces that are not used much (basement, spare/guest room, etc.), then what SHOULD happen when ANYONE tries to call your AT&T number is:
- Endless ringing (if you do NOT have voicemail on this line) OR
- Certain number of rings, then switch to voicemail (if you have that service).
So IF ALL these conditions are met (nothing connected in any room of your home & getting "beeps"), then this is a definite "phone service" issue.
This could be with the LOCAL phone lines & service, OR the wiring INSIDE your home (not too likely - unless getting into walls has happened).
So at this point, I would recommend contacting AT&T Technical Support - via your cell phone. I have their MAIN contact number below, but you will have to go through a "menu" - to reach a human and report this issue.
AT&T Customer Support : 1(###) ###-####/p>
By the way, the Technical Support folks SHOULD be there 24 hours a day - every day - and they MAY be able to further troubleshoot and TEST your line - while on the call.
Please let me know what is found or if you have any more questions.
Thanks, ***** *****