New Delhi : The Centre has said telecom networks can use trusted products from approved companies for the “expansion” of existing networks, or otherwise permission needs to be taken from the ‘designated authority’ of the government, in a move to further restrict the use of products supplied by Chinese majors Huawei and ZTE . On Monday, the department of telecommunications (DoT) issued a new notification on which added the word “expansion” along with the previously-mentioned “upgradation” where permission would be needed from the government’s body. The telecom department, however, maintained the earlier exemption given for projects involving annual maintenance contracts...