DH:

Former U.S. Sen. Mark Kirk is stepping out of retirement to criticize a Naperville telecommunications company he says is doing business in Iran.

Coriant, which develops software for voice, data and mobile networks and also has headquarters in Munich, is listed as an exhibitor at the Iran Telecom Innovations Show this week in Tehran. Kirk says he's concerned because the conference appears to be supported by the Iranian Communications Regulatory Authority, which remains subject to significant U.S. sanctions.

Coriant spokesman Scott Larson did not respond to a request for comment.

The group sent a 14-page letter this month to Shaygan Kheradpir, CEO and chairman of Coriant.

The letter, which says the company got more than $19 million in U.S. government contracts last year, asks for clarification why a leading international business "would want to engage with Iran when the Islamic Republic has shown no inclination to respect basic human rights or avoid the sponsorship of terrorism."

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