Permira, KKR and CVC Capital are among the private equity firms bidding for Citigroup's (C) Bellsystem24, Reuters reported Tuesday, citing unnamed sources.

Bain Capital and Itochu Corp. (8001.TO) also submitted bids, said the report on Reuters Web site. The deal could be worth over $1 billion.

The telemarketer is owned by Citi's Nikko Principal Investments.

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