Several months ago Indian ISPs were ordered by the Calcutta High Court to block access to certain web sites - "The ISPs have been given 36 hours to comply, by either blocking domain \ IP addresses or by using Deep Packet Inspection to ban the offending URLs" (see "Indian ISPs need to Block Sites - Will they Use DPI?" - here).
The Center for Internet & Society (CIS) "filed requests under the Right to Information with the Department of Telecommunications, Telecom Regulatory Authority of India, BSNL and MTNL, asking a number of questions related to the use of Deep Packet Inspection (DPI) technology by Internet Service Providers (ISP) in India and corresponding regulations".
DoT response (here): "as per the present License for provision of Internet Services, based on Internet Guidelines dated 24/08/2007, there is no direction/reference for DPI as mentioned in your RTI application".
CIS also asked BSNL/MTNL "As a national Internet service Provider, does BSNL deploy DPI on any Internet network in India?"
"MTNL has responded to the application, while the response from BSNL is awaited. In response to the above questions, MTNL sent the following reply: 'MTNL does not do any DPI'".
See "Use of DPI Technology by ISPs — Response by the Department of Telecommunications" - here.