So I connected a landline today and I can hear the dial tone. Tried dialing a couple of numbers but all say "All lines of this root are currently busy". Dialed 121 and it got connected. Did a complaint to Customer care. First, they said the landline is not available but after telling them I am calling from the landline only. She put me on hold and then confirmed Landline is available in some areas in Patna but not everywhere. She took a complaint about outgoing and incoming call and have asked to wait for 24hrs. I will share the result as soon as I have an update.