Companies owned by billionaires Mukesh Ambani and Sunil Bharti Mittal may raise as much as Rs 365 billion (Dollar 5.6 billion) selling bonds as the telecom titans build a war chest in what investors hope will be the home stretch in Indias bruising tariff war. Mittal-controlled Bharti Airtel Ltd. which sold its first-ever rupee bond of Rs 30 billion last month, has approval to raise Rs 165 billion , according to a March 12 filing. Reliance Jio Infocomm Ltd. announced days later that it plans to sell as much as Rs 200 billion of notes, marking the disruptive upstarts return to the onshore bond market after 20 months. The fundraising amount about 78 Percent of the total outstanding bonds of Indias top four telecom firms signal that the largest carrier and its rival Jio are gearing to roll out next-generation services and manage about Rs 320 billion debt due in the next five years. Jio stormed into the mobile-phone market in 2016 with free services that set off a tariff war and forced smaller players to merge or exit.