Vinod Kumar, managing director and chief executive officer of Tata Communications spoke to NDTV Profit's Vijay Ganeshan Iyer about the company's global and domestic operations, as well as its revenue models for the coming quarters. "The last 5-6 years, we had to invest heavily to transform the business model to make sure that we shift from voice to data, wholesale to enterprises, India to global. We now have a portfolio that we are confident of," he said.