Bharti Airlet has slashed how long an outgoing call will ring before getting disconnected- a tit for tat retaliation to a similar move by rival Reliance Jio, as the two companies fight for dominance in the world’s second largest telecom market.Bharti Airtel, the second-ranked operator by revenue, has told the telecom regulator that it has cut the ringing time for outgoing calls on a rival network to 25 seconds from 45.The company said it took the step as despite its repeated requests, the Telecom Regulatory Authority of India (Trai) has neither directed Reliance Jio Infocomm Ltd, the biggest telecom operator, to restore the timer to its original duration of 45 seconds nor issued a direction to operators to set the timer to 30 seconds as proposed by most of the operators.Typically, a telecom operator pays for connecting calls of its subscribers to the company on whose network a call terminates. Currently, an operator is required to pay 6 paise per minute as mobile call termination charge, called IUC. The IUC was originally proposed to be made nil from 1 January, 2020. But TRAI is now reviewing the timeline.