sentences:  Airtel's proposed acquisition of consumer mobile business of Tata Teleservices and Tata Docomo has got DoT's nod for further approval according to CCI.The Department of Telecom (DoT) has given approval for the merger of Tata Teleservices (TTSL) with Bharti Airtel, subject to the condition that the Bharti Airtel firm furnishes Rs 7,200 crore worth bank guarantee.On November 2017, Tata Teleservices mobile customers had started transitioning to the Airtel's network.