However, its contribution will go down from 91 percent in 2008 to 77 percent in 2013.

The number of fixed lines will continue to decrease slightly until 2012, but will start picking up again in 2013 as carriers will focus more on fixed broadband, bundling voice lines free with it, Gartner said.

The connection and calling revenue will, however, fall slowly, it added.

Revenue from broadband services will significantly contribute to the overall growth of fixed-line services in India, with a growth of 25 percent from 2008 to 2013.

Broadband will overtake dial-up as the primary access technology by 2012-end. According to Gartner, there will be a drop in broadband average revenue per user as penetration to semi-urban and rural areas increase.

Wireless broadband services will also grow significantly from 2010, by expanding broadband coverage to areas previously not covered by copper telephone lines, it added.