Probably powered by the same engine with MTNL, http://mms.aptelecom.gov.in/mmswebtop/index.html of APTelecom having a very similar interface.
Quoted from Wikipedia:
Bharat Sanchar Nigam Limited (known as BSNL, India Communications Corporation Limited) is a public sector telecommunicationcompany in India. It is India’s largest telecommunication company with 24% market share as on March 31, 2008. Its headquarters are at Bharat Sanchar Bhawan, Harish Chandra Mathur Lane, Janpath, New Delhi. It has the status of Mini Ratna, a status assigned to reputed public sector companies in India.
BSNL is India’s oldest and largest Communication Service Provider (CSP). Currently has a customer base of 90 million as of June 2008. It has footprints throughout India except for the metropolitan cities of Mumbai and New Delhi which are managed byMTNL. As on March 31, 2008 BSNL commanded a customer base of 31.55 million Wireline, 4.58 million CDMA-WLL and 54.21 million GSM Mobile subscribers. BSNL’s earnings for the Financial Year ending March 31, 2007 stood at INR 397.15b (US$ 9.67 b) with net profit of INR 78.06b (US$ 1.90 billion). BSNL has an estimated market value of $ 100 Billion. The company is planning an IPO with in 6 months to offload 10% to public in the Rs 300-400 range valuing the company at over $100 billion.