Starting Oct. 15, 2013, the Indian Patent Office will serve as the International Searching Authority and International Preliminary Examining Authority under the Patent Cooperation Treaty. For details, please follow the link:
http://ipindiaservices.gov.in/isaweb/agreement.pdf
Currently there are only 17 national/regional offices qualified to perform such functions for the World Intellectual Property Office (see WIPO web page http://www.wipo.int/pct/en/access/isa_ipea_agreements.html for a full listing). Congratulations, India!