The Pakistan Telecommunication Authority (PTA) has so far blocked around 290,000 telephone connections for being involved in grey traffic. Over 50,000 connections were blocked after October 2012 as part of non-system activities presently being carried out by the authority. An official source Tuesday told APP that the PTA had a technical system to monitor international telephone traffic. The system became operational in May 2008 and was expanded in early 2009. He said that the aim of system, installed with the funding of Long Distance International (LDI) operators, was to monitor all international voice traffic being terminated into Pakistan for identification of illegal channels employed by grey operators. He said that the system monitored IP and SS7 traffic on submarine cables to identify illegal calls brought in the country by grey operators and to record CDRs of LDI licensees for revenue assurance.