Second hand/ refurbished goods are restricted for imports, r

respected sir, 

                 i wish to import refurbished Cisco routers from China to complete my training for CCIE, i will be paying through paypal to china & they will send items through dhl. i had posted  a thread /forum/need-info-on-anti-dumping-duty-225172.asp#.UIiqCezBUmt  , someone had said that SECOND HAND/ REFURBISHED GOODS ARE RESTRICTED FOR IMPORTS, REQUIRE A LICENCE FROM DGFT, the people from china said that they had sent many refurbished routers to india(to some companies),  i just wanted to know what kind of license do we require to import refurbished items?  do i require any certificate from a chartered accountant for import of second hand goods? 

ambrish sadhu