Not really sure what section to put this in but you seem like a knowledgeable crowd so here goes.
Recently my house phone has been giving me some problems - people trying to phone me get a message saying the phone is in use (it diverts to 1571). We also have no dial tone when calling out so basically we can't make or receive calls. Nothing has been changed recently as far as im aware and my internet connection is working fine.
We've tried connecting the phone to different sockets in the house but no luck. There are filters on all connections etc and I've run out of ideas of what could be wrong.
Any help will be greatly appreciated as im tearing my hair out here