Sorenson Communications Inc., a provider of video services for the deaf partly controlled by Madison Dearborn Partners LLC, filed for bankruptcy, blaming price cuts and service requirements imposed by federal regulators.

Sorenson had about $645 million in assets and $1.4 billion in liabilities as of Jan. 31, it said today in court papers filed in U.S. Bankruptcy Court in Wilmington, Delaware. The Salt Lake City-based company is regulated by the Federal Communications Commission.

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