India has been recognized by the World Intellectual Property Organization as the 17th International Search Authority (ISA) and International Preliminary Examining Authority (IPEA) in the world.
This would enable Indian companies to apply for PCT applications by filing same in India.
Being the only English speaking country in the Asian region to be recognized as an ISA and IPEA should attract applicants form other English speaking Asian regions.
Lower official fees compared to corresponding International Searching Authorities and International Preliminary Examining Authority should also work as one of the primary attractions for opting India as ISA and / or IPEA.
You may access the agreement between the Indian Patent Office and the International Bureau of the World Intellectual Property Organization over here – http://ipindiaservices.gov.in/isaweb/agreement.pdf