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.