Liberty Media President-CEO Greg Maffei stepping down at year-end with Chairman John Malone becoming interim CEO; Maffei to serve as senior adviser during transition ... Radcom names Benny Eppstein, ex-Amdocs, as CEO, effective Dec. 1 ... The Next Generation 9-1-1 Institute elects to board Todd Piett, Motorola Solutions; Jennifer White, RapidSOS; Manuel Silva, Frontier; Eric Hagerson, T-Mobile; and Mike Tan, AT&T.