Aircel, BSNl and Vodafone are not meeting the quality service benchmark for call drops in some telecom circles, Parliament was informed on Friday. “As regards, the parameter worst affected cells having more than 3 per cent call drop rate, Aircel is not meeting the benchmark in 18 service areas, BSNl in 5 and Vodafone in 2 service areas,” Telecom Minister Ravi Shankar Prasad said in a written reply to the Rajya Sabha.The performance on call drop is accessed through quality of service parameters like call drop rate/circuit switch voice drop rate for which benchmark is less than or equal to 2 per cent), he added.