Central Telegraph Office,Delhi Central Telegraph Office,Mumbai Central Telegraph Office,Calcutta Central Telegraph Office,Pune Telephone Exchange Bldg.(since 1885),Simla Dak Bhawan,Bhopal housing National Telecom Museum Sanchar Bhawan,Delhi Videsh Sanchar Nigam Ltd., Mumbai
Amarnath Caves(temporary telecom centre during 1997) Somewhere on the border hills
