Former Telecom Minister Dayanidhi Maran, his brother Kalanithi Maran and four others were on Friday chargesheeted by the Enforcement Directorate in the Special 2G court.
The CBI had summoned Karti to appear before it on October 4.
They were chargesheeted for alleged offences punishable under section 120-B (criminal conspiracy) of IPC and under relevant provisions of the Prevention of Corruption Act.
The agency, sources said, has issued the notices under the Prevention of Money Laundering Act (PMLA) and they have summoned the accused to examine them and record their statements.
On August 29, CBI had filed the charge sheet in the case against Dayanidhi, Kalanithi and six others, including four firms.
He was chargesheeted for the offences punishable under section 120-B
Special CBI Judge O P Saini took cognisance of the CBI's charge sheet filed against eight accused including four companies and summoned them on March 2, 2015.
Former Telecom Minister Dayanidhi Maran had "pressurised" and "forced" Chennai-based telecom promoter C Sivasankaran to sell his stakes in Aircel and two subsidiary firms to Malaysian firm Maxis Group in 2006, the CBI on Thursday told a special court.
The sources said the matter should have been referred to the Cabinet Committee on Economic Affairs as foreign investments above Rs 600 crore (Rs 6 billion) can only be cleared by Cabinet Committee on Economic Affairs headed by the Prime Minister.
Chidambaram was competent to give approval of upto Rs 600 crore but he gave the approval which was worth approximately Rs 3,500 crore
Former Telecom Minister Dayanidhi Maran, his brother Kalanidhi Maran and six others, including four companies, were on Friday chargesheeted by the CBI in a special court in the Aircel-Maxis deal case arising out of the investigation in the 2G spectrum allocation scam.