BANGALORE, Dec 31 (Reuters) - Indian shares opened up 0.6 percent and quickly extended gains to more than 1 percent on Monday in the final trading session of 2007, led by telecoms firm Bharti Airtel Ltd <BRTI.BO>.

At 9:57 a.m. (0427 GMT) the main 30-share BSE index <.BSESN> was up 1.23 percent, or 249.22 points, at 20,456.17, with all but two components rising.

The 50-issue NSE index <.NSEI> was up 1.16 percent at 6,150.05.

Bharti Airtel opened up 5.2 percent at 990 rupees on the BSE after the leading mobile operator said on Friday seven overseas investors, including Temasek and Goldman Sachs <GS.N>, had agreed to buy up to 9 percent in its tower arm for a total $1 billion. (Reporting by Sumeet Chatterjee; Editing by John Mair) (([email protected]; +91-80-3982 7450; Reuters Messaging: [email protected]))

Keywords: INDIA STOCKS/OPEN