Reliance Infratel has more than 45,000 mobile towers, and proceeds from the stake sale will help the company reduce debt this fiscal.
"The company has received indicative non-binding bids from a number of interested buyers, and has short-listed a smaller number of very credible interested parties to progress to the next round of the process," RCom said in a statement.
The company added it has short-listed some bidders that have expressed interest to acquire up to 100 per cent of RCom's stake in Reliance Infratel.
The company had a net debt of Rs 38,595.7 crore at the end of June 30, 2015.
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Sources had said RCom was in talks with American Tower Company (ATC) and Carlyle and others for selling a majority stake in Reliance Infratel.
"Further to our letters dated May 6, 2015, May 20, 2015 and June 29, 2015 to BSE and July 31, 2015 to NSE, we wish to inform you that the formal process for sale of a controlling 51 per cent stake in Reliance Infratel was launched a few weeks back, and got a very positive response," the statement added.