Seitter in her home studio. Photograph: Gary Wayne Gilbert

Every day, millions of people around the country hang on Julie Seitter’s words. Dial Amtrak, Bank of America, or the U.S. Postal Service and her upbeat soprano will guide you through the steps—“If you would like to continue in English, press one . . .”—of canceling a check, arranging a delivery, or making a reservation.

Seitter is a professional voice talent. Moreover, she’s part of a customer service industry trend to make interactive voice systems more personable. For Amtrak, which named its voice-recognition system after her, she opens with a cheery, “Hi, I’m Julie.” The tone is one part efficient android, two parts next-door neighbor.

Sequestered in a recording studio, surrounded by computers and audio equipment, the strawberry blonde performs a juggling act—intently tracking the script, while watching a computer monitor to see that her volume and pitch stay within a narrow range. When Seitter wants to sound friendlier she smiles while speaking. On a recent afternoon, however, her grin faded as she recorded long lists of diseases for Blue Cross Blue Shield before finally coming to a familiar phrase: “I’m sorry. I didn’t understand what you said.” (“I’m really good at apologizing,” Seitter says with a smile.)

At Boston College, the Chicago-area native caught the radio bug reading news for WZBC, the University station. She continued her radio career after college, eventually landing work as a reporter and anchor at Boston’s WBZ. In 2000, her sister showed her a newspaper story about voice work, and Seitter cold-called an area studio for an audition.

In short order, she won the Amtrak job. Other clients have followed steadily since, and in 2005 she left radio for the medium of telephone. She records most of her material in a studio at her home outside Boston, where she lives with her husband and two sons.

Seitter’s Amtrak persona has made her a celebrity of sorts. She took part in a 2002 Valentine’s Day spoof on National Public Radio in which “Julie” and “Tom,” the voice of United Airlines and Apple, try unsuccessfully to arrange a date (“you’re kind of a control freak, aren’t you,” he says). She’s also inspired skits on Saturday Night Live.

Recently, Seitter called a credit card company, only to hear her own voice ask for personal information. “I thought, come on, you know my phone number.”

Amy Sutherland is a writer based in the Boston area.