Yet another angle in which The Central Bureau of Investigation (CBI) wants to persuade probe against former communications minister Dayanidhi Maran's house in Chennai in 2007, for alleged use of 323 Integrated Services Digital Network (ISDN) connections capable of carrying huge data and facilitating faster transmission of TV news and programmes, an official said Monday.

The DMK strong man’s residences was wired with hundreds of telephone lines installed on unknown people’s names was to be probed by the CBI. It is likely to file a preliminary enquiry against these unknown people. An official said we are investigating and are likely to file a preliminary enquiry (PE) regarding this.

There were 323 telephone connections installed at Maran's residence which were allegedly used by the former minister's brother Kalanithi Maran, who is the managing director of Sun TV Network. An official informed that these 323 residential lines were in the name of then Bharat Sanchar Nigam Ltd. General Manager connecting the Boat House residence of Maran with the office of Sun TV through a dedicated underground cable.

The official said that the probe agency in 2007 informed the telecom secretary about the phone lines but the department did not give the nod to conduct a probe. This all happened during the tenure of Maran as communications minister from 2004-07 in United Progressive Alliance-I. The DMK leader quit as textiles minister in July over his alleged role in the 2G spectrum scam.