Reason for your dropped calls: Point of Interconnection (PoI) is higher than benchmarkAug 26, 2008
Point of Interconnection (PoI) parameter signifies the ease with which a customer of one network is able to communicate with a customer of another network. This parameter also reflects as to how effective is the interconnection between the two networks.
For April-June quarter, which said amongst the private service providers Bharti Airtel has the largest number of PoIs having congestion (56 PoIs as of June) followed by Reliance Communications (22 PoIs), Dishnet Wireless (21 PoIs as of March), Vodafone (19 PoIs of March) and Idea (19 PoIs).
The benchmark notified by TRAI in the Quality of Service (QoS) Regulation of July 2005 for this parameter should be less than 0.5 per cent. This means out of 200 calls between two operators only one call should face congestion problem.
The circles/ states more affected due to PoI congestion are Bihar, Maharastra, Gujarat, Haryana, North Eastern states and Himachal Pradesh.
Airtel, RCOM most congested networks: TRAI - The Financial Express