Intrado, a longtime key player in the 911 industry, has sold its safety business to the Stonepeak investment firm for $2.4 billion, but Intrado will retain its Digital Workflows unit, according to a press release issued yesterday.

For more than four decades, Intrado Safety has played a crucial role in delivering 911 calls from citizens to public-safety answering points (PSAPs)—a role it is expected to continue to play under the ownership of Stonepeak, according to Intrado President and CEO John Shlonsky.