Termination of STD-PCO telephone on the ground of sub-letting. Authorising son to manage business cannot be equated to a case of sub-letting. There is no bar in conducting booth by any person with authority and after proper intimation to the Department. [ N.R.Gopi vs Union of India. AIR 2000 Ker 243. Dr.AR.Lakshmanan & Mrs.D.Sreedevi (J&J)]