With the issue over call drops refusing to die down, Telecom Secretary J S Deepak has called a meeting of CEOs of mobile service providers to discuss that and much more. "The telecom secretary has called a meeting of CEOs of telecom companies on June 10 to discuss issues in the sector and call drops," Indianmandarins was told. In the latest test drive conducted by the Trai in Delhi, the state-owned telecom operator MTNL BSE 0.80 %failed on all network-based quality of service parameters. "Airtel, Vodafone, Reliance, Aircel and Idea need to further improve the call drop rate performance. The CDMA operators and MTNL need to improve across all parameters in order to offer acceptable levels of service," Trai said in the report. As per the report for Delhi, Aircel and Vodafone have been using radio-link technology (RLT) beyond the levels their peers follow. RLT is one of the parameters which decides for how long the call should be sustained if the signal quality drops below a certain threshold. As per an official source, some telecom operators are using it for masking call drops, resulting in higher bills for subscribers. Worried about the problem, the Telecom Regulatory Authority of India (Trai) has sought more powers to penalise mobile operators as most of them have failed to meet the quality benchmark in this regard.