Sensex extended gains to 1 per cent on Friday morning, with telecom stocks and IT firms leading the gains.
Infosys Technologies rose as much as 1.9 per cent to a record high of 2,879 rupees ahead of its quarterly earnings on Tuesday.
Leading telecom firms Bharti Airtel and Reliance Communications rallied as much as 8.2 per cent and 2.8 per cent respectively, after Credit Suisse upgraded Bharti to "outperform" from "neutral" and Reliance Communications to "neutral" from "underperform".
At 10:01 am, the 30-share BSE index was up 1.04 per cent at 17,834.45 points, with 28 components advancing.
The 50-share NSE index was up nearly 1 per cent at 5,348.60.